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Quick Table of Contents
7 Formatting Properties 7.1 Description of Property Groups 7.2 XSL Areas and the CSS Box Model 7.3 Common Accessibility Properties 7.4 Common Absolute Position Properties 7.5 Common Aural Properties 7.6 Common Border, Padding, and Background Properties 7.7 Common Font Properties 7.8 Common Hyphenation Properties 7.9 Common Margin Properties-Block 7.10 Common Margin Properties-Inline 7.11 Common Relative Position Properties 7.12 Area Alignment Properties 7.13 Area Dimension Properties 7.14 Block and Line-related Properties 7.15 Character Properties 7.16 Color-related Properties 7.17 Float-related Properties 7.18 Keeps and Breaks Properties 7.19 Layout-related Properties 7.20 Leader and Rule Properties 7.21 Properties for Dynamic Effects Formatting Objects 7.22 Properties for Markers 7.23 Properties for Number to String Conversion 7.24 Pagination and Layout Properties 7.25 Table Properties 7.26 Writing-mode-related Properties 7.27 Miscellaneous Properties 7.28 Shorthand Properties

## 7 Formatting Properties

### 7.1 Description of Property Groups

The following sections describe the properties of the XSL formatting objects.

A number of properties are copied from the CSS2 specification. In addition, the CSS2 errata all apply. See [CSS2].

- The first nine sets of property definitions have been arranged into groups based on similar functionality and the fact that they apply to many formatting objects. In the formatting object descriptions the group name is referred to rather than referring to the individual properties.

  - Common Accessibility Properties

    This set of properties are used to support accessibility.

  - Common Absolute Position Properties

    This set of properties controls the position and size of formatted areas with absolute positioning.

  - Common Aural Properties

    This group of properties controls the aural rendition of the content of a formatting object. They appear on all formatting objects that contain content and other formatting objects that group other formatting objects and where that grouping is necessary for the understanding of the aural rendition. An example of the latter is fo:table-and-caption.

  - Common Border, Padding, and Background Properties

    This set of properties controls the backgrounds and borders on the block-areas and inline-areas.

  - Common Font Properties

    This set of properties controls the font selection on all formatting objects that can contain text.

  - Common Hyphenation Properties

    Control of hyphenation for line-breaking, including language, script, and country.

  - Common Margin Properties-Block

    These properties set the spacing and indents surrounding block-level formatting objects.

  - Common Margin Properties-Inline

    These properties set the spacing surrounding inline-level formatting objects.

  - Common Relative Position Properties

    This set of properties controls the position of formatted areas with relative positioning.

- The remaining properties are used on a number of formatting objects. These are arranged into clusters of similar functionality to organize the property descriptions. In the formatting object description the individual properties are referenced.

  - Area Alignment Properties

    Properties that control the alignment of inline-areas with respect to each other, particularly in relation to the mixing of different baselines for different scripts. In addition, there are two properties: "display-align" and "relative-align" that control the placement of block-areas.

  - Area Dimension Properties

    Properties that control the dimensions of both block-areas and inline-areas.

  - Block and Line-related Properties

    Properties that govern the construction of line-areas and the placement of these line-areas within containing block-areas.

  - Character Properties

    Properties that govern the presentation of text, including word-spacing, letter-spacing, and word-space treatment and suppression.

  - Color-related Properties

    Properties that govern color and color-model selection.

  - Float-related properties

    Properties governing the placement of both side-floats (start- and end-floats) and before-floats ("top" floats in "lr-tb" writing-mode).

  - Keeps and Breaks Properties

    Properties that control keeps and breaks across pages, columns, and lines, including widow and orphan control and keeping content together.

  - Layout-related Properties

    These properties control what is "top" ("reference-orientation") as well as clipping, overflow, and column-spanning conditions.

  - Leader and Rule Properties

    Properties governing the construction of leaders and horizontal rules.

  - Properties for Dynamic Effects

    Properties governing the presentation and actions associated with links and other dynamic effects.

  - Properties for Markers

    Properties governing the creation and retrieval of markers. Markers are used typically for "dictionary" headers and footers.

  - Properties for Number to String Conversions

    Properties used in the construction of page-numbers and other formatter-based numbering.

  - Pagination and Layout Properties

    These properties govern the sequencing, layout, and instantiation of pages, including: the page size and orientation, sizes of regions on the page-master, the identification and selection of page-masters, division of the body region into columns, and the assignment of content flows to layout regions.

  - Table Properties

    Properties governing the layout and presentation of tables.

  - Writing-mode-related Properties

    Properties related to various aspects of "directionality" and writing-mode influencing block-progression-direction and inline-progression-direction.

  - Miscellaneous Properties

    These properties did not reasonably fit into any of the other categories.

- Shorthand Properties

  Shorthand properties that are part of the complete conformance set. Shorthands expand to the individual properties that may be used in place of shorthands.

### 7.2 XSL Areas and the CSS Box Model

This section describes how to interpret property descriptions which incorporate the CSS2 definition of the same property. In CSS2, "boxes" are generated by "elements" in the same way that XSL areas are generated by formatting objects. Any references in the CSS2 definition to "boxes" are to be taken as referring to "areas" in the XSL area model, and where "element" appears in a CSS2 definition it should be taken to refer to a "formatting object".

The position and size of a box are normally taken to refer to the position and size of the area's content-rectangle. Additional correspondences between the CSS2 Box Model and the XSL Area Model are contained in the following table.

Box | Area
top content edge | top edge of the content-rectangle
padding edge | padding-rectangle
content area | interior of the content-rectangle
padding area | region between the content-rectangle and the padding-rectangle
border area | region between the padding-rectangle and the border-rectangle
background | background
containing block | closest ancestor block-area
caption | area generated by fo:table-caption
inline box | inline-area
line box | line-area
block box | block-area which is not a line-area
page box | page-area

Box margins map to area traits in accordance with the description of how area traits are computed from property values in [5 Property Refinement / Resolution].

### 7.3 Common Accessibility Properties

#### 7.3.1 "source-document"

XSL Definition:

Value: | <uri-specification> [<uri-specification>]* | none | inherit
Initial: | none
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | all

It is used by all formatting objects that can be contained in fo:flow or fo:static-content (all formatting objects that can be directly created from an XML source element).

Values have the following meanings:

none

  The source document is transient, unknown, or unspecified.

<uri-specification>

  A URI-specification giving a reference to the (sub)resource used as input to the stylesheet.

This property provides a pointer back to the original XML document(s) used to create this formatting object tree, in accordance with the Dublin Core definition of "Source" ("A Reference to a resource from which the present resource is derived." See: http://purl.org/DC/documents/rec-dces-19990702.htm.) The value is not validated by and has no inherent standardized semantics for any XSL processor.

W3C Accessibility guidelines strongly encourage the use of this property either on the fo:root or on the first formatting object generated from a given source document.

The URI reference is useful for alternate renderers (aural readers, etc.) whenever the structure of the formatting object tree is inappropriate for that renderer.

#### 7.3.2 "role"

XSL Definition:

Value: | <string> | <uri-specification> | none | inherit
Initial: | none
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | all

It is used by all formatting objects that can be contained in fo:flow or fo:static-content (all formatting objects that can be directly created from an XML source element).

Values have the following meanings:

none

  Indicates that no semantic tag is cited by this formatting object.

<string>

  The value is a string representing a semantic identifier that may be used in rendering this formatting object.

<uri-specification>

  An URI-specification, indicating an RDF resource [RDF]; that is, an XML object that is syntactically valid with respect to the RDF grammar.

This property provides a hint for alternate renderers (aural readers, etc.) as to the role of the XML element or elements that were used to construct this formatting object, if one could be identified during XSLT tree construction. This information can be used to prepare alternate renderings when the normal rendering of a formatting object is not appropriate or satisfactory; for example, the role information can be used to provide better aural renderings of visually formatted material.

To aid alternate renderers, the <string> value should be the qualified name (QName [W3C XML Names] of the element from which this formatting object is constructed. If a QName does not provide sufficient context, the <uri-specification> can be used to identify an RDF resource that describes the role in more detail. This RDF resource may be embedded in the result tree and referenced with a relative URI or fragment identifier, or the RDF resource may be external to the result tree. This specification does not define any standard QName or RDF vocabularies; these are frequently application area dependent. Other groups, for example the Dublin Core, have defined such vocabularies.

This property is not inherited, but all subsidiary nodes of this formatting object that do not bear a role property should utilize the same alternate presentation properties. (It is not inherited because knowledge of the start and end of the formatting object subtree generated by the element may be needed by the renderer.)

### 7.4 Common Absolute Position Properties

#### 7.4.1 "absolute-position"

A Property Derived from a CSS2 Property.

Value: | auto | absolute | fixed | inherit
Initial: | auto
Applies to: | fo:block-container
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  There is no absolute-positioning constraint. Positioning is in accordance with the relative-position property.

absolute

  The area's position (and possibly size) is specified with the "left", "right", "top", and "bottom" properties. These properties specify offsets with respect to the area's containing area. Absolutely positioned areas are taken out of the normal flow. This means they have no impact on the layout of later siblings. Also, though absolutely positioned areas have margins, they do not collapse with any other margins.

fixed

  The area's position is calculated according to the "absolute" model, but in addition, the area is fixed with respect to some reference. In the case of continuous media, the area is fixed with respect to the viewport (and doesn't move when scrolled). In the case of paged media, the area is fixed with respect to the page, even if that page is seen through a viewport (in the case of a print-preview, for example). Authors may wish to specify "fixed" in a media-dependent way. For instance, an author may want an area to remain at the top of the viewport on the screen, but not at the top of each printed page.

The following additional restrictions apply for paged presentations:

- Only objects with absolute-position="auto" may have page/column breaks.

  For other values any keep and break properties are ignored.

- The area generated is a descendant of the page-area where the first area from the object would have been placed had the object had absolute-position="auto" specified.

#### 7.4.2 "top"

CSS2 Definition:

Value: | <length> | <percentage> | auto | inherit
Initial: | auto
Applies to: | positioned elements
Inherited: | no
Percentages: | refer to height of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-top.

The "top" property specifies how far a box's top content edge is offset below the top edge of the box's containing block.

XSL modifications to the CSS definition:

See definition of property left ([7.4.5 "left"]).

#### 7.4.3 "right"

CSS2 Definition:

Value: | <length> | <percentage> | auto | inherit
Initial: | auto
Applies to: | positioned elements
Inherited: | no
Percentages: | refer to height of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-right.

The "right" property specifies how far a box's right content edge is offset to the left of the right edge of the box's containing block.

XSL modifications to the CSS definition:

See definition of property left ([7.4.5 "left"]).

#### 7.4.4 "bottom"

CSS2 Definition:

Value: | <length> | <percentage> | auto | inherit
Initial: | auto
Applies to: | positioned elements
Inherited: | no
Percentages: | refer to height of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-bottom.

The "bottom" property specifies how far a box's bottom content edge is offset above the bottom of the box's containing block.

XSL modifications to the CSS definition:

See definition of property left ([7.4.5 "left"]).

#### 7.4.5 "left"

CSS2 Definition:

Value: | <length> | <percentage> | auto | inherit
Initial: | auto
Applies to: | positioned elements
Inherited: | no
Percentages: | refer to height of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-left.

The "left" property specifies how far a box's left content edge is offset to the right of the left edge of the box's containing block.

The values of the four (position offset) properties have the following meanings:

auto

  The effect of this value depends on which of related properties have the value "auto" as well. See the sections on the width and height of absolutely positioned, non-replaced elements for details.

<length>

  The offset is a fixed distance from the reference edge.

<percentage>

  The offset is a percentage of the containing block's width (for "left" or "right") or "height" (for "top" and "bottom"). For "top" and "bottom", if the "height" of the containing block is not specified explicitly (i.e., it depends on content height), the percentage value is interpreted like "auto".

For absolutely positioned boxes, the offsets are with respect to the box's containing block. For relatively positioned boxes, the offsets are with respect to the outer edges of the box itself (i.e., the box is given a position in the normal flow, then offset from that position according to these properties).

XSL modifications to the CSS definition:

These properties set the position of the content-rectangle of the associated area.

If both "top" and "bottom" are specified, the height of the content-rectangle is overridden. If both "left" and "right" are specified, the width of the content-rectangle is overridden.

### 7.5 Common Aural Properties

#### 7.5.1 "azimuth"

CSS2 Definition:

Value: | <angle> | [[ left-side | far-left | left | center-left | center | center-right | right | far-right | right-side ] || behind ] | leftwards | rightwards | inherit
Initial: | center
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-azimuth.

#### 7.5.2 "cue-after"

CSS2 Definition:

Value: | <uri-specification> | none | inherit
Initial: | none
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-cue-after.

XSL modifications to the CSS definition:

The <uri> value has been changed to a <uri-specification>.

#### 7.5.3 "cue-before"

CSS2 Definition:

Value: | <uri-specification> | none | inherit
Initial: | none
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-cue-before.

XSL modifications to the CSS definition:

The <uri> value has been changed to a <uri-specification>.

#### 7.5.4 "elevation"

CSS2 Definition:

Value: | <angle> | below | level | above | higher | lower | inherit
Initial: | level
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-elevation.

#### 7.5.5 "pause-after"

CSS2 Definition:

Value: | <time> | <percentage> | inherit
Initial: | depends on user agent
Applies to: | all elements
Inherited: | no
Percentages: | see prose
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-pause-after.

#### 7.5.6 "pause-before"

CSS2 Definition:

Value: | <time> | <percentage> | inherit
Initial: | depends on user agent
Applies to: | all elements
Inherited: | no
Percentages: | see prose
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-pause-before.

#### 7.5.7 "pitch"

CSS2 Definition:

Value: | <frequency> | x-low | low | medium | high | x-high | inherit
Initial: | medium
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-pitch.

#### 7.5.8 "pitch-range"

CSS2 Definition:

Value: | <number> | inherit
Initial: | 50
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-pitch-range.

#### 7.5.9 "play-during"

CSS2 Definition:

Value: | <uri-specification> mix? repeat? | auto | none | inherit
Initial: | auto
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-play-during.

XSL modifications to the CSS definition:

The <uri> value has been changed to a <uri-specification>.

#### 7.5.10 "richness"

CSS2 Definition:

Value: | <number> | inherit
Initial: | 50
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-richness.

#### 7.5.11 "speak"

CSS2 Definition:

Value: | normal | none | spell-out | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-speak.

#### 7.5.12 "speak-header"

CSS2 Definition:

Value: | once | always | inherit
Initial: | once
Applies to: | elements that have table header information
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/tables.html#propdef-speak-header.

#### 7.5.13 "speak-numeral"

CSS2 Definition:

Value: | digits | continuous | inherit
Initial: | continuous
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-speak-numeral.

#### 7.5.14 "speak-punctuation"

CSS2 Definition:

Value: | code | none | inherit
Initial: | none
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-speak-punctuation.

#### 7.5.15 "speech-rate"

CSS2 Definition:

Value: | <number> | x-slow | slow | medium | fast | x-fast | faster | slower | inherit
Initial: | medium
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-speech-rate.

#### 7.5.16 "stress"

CSS2 Definition:

Value: | <number> | inherit
Initial: | 50
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-stress.

#### 7.5.17 "voice-family"

CSS2 Definition:

Value: | [[<specific-voice> | <generic-voice> ],]* [<specific-voice> | <generic-voice> ] | inherit
Initial: | depends on user agent
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-voice-family.

#### 7.5.18 "volume"

CSS2 Definition:

Value: | <number> | <percentage> | silent | x-soft | soft | medium | loud | x-loud | inherit
Initial: | medium
Applies to: | all elements
Inherited: | yes
Percentages: | refer to inherited value
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-volume.

### 7.6 Common Border, Padding, and Background Properties

The following common-border-padding-and-background-properties are taken from CSS2. Those "border", "padding", and "background" properties that have a before, after, start, or end suffix are writing-mode relative and are XSL-only properties.

#### 7.6.1 "background-attachment"

CSS2 Definition:

Value: | scroll | fixed | inherit
Initial: | scroll
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background-attachment.

scroll

  The background-image may scroll with the enclosing object.

fixed

  The background-image is to be fixed within the viewable area of the enclosing object.

If a background-image is specified, this property specifies whether it is fixed with regard to the viewport (fixed) or scrolls along with the document (scroll).

Even if the image is fixed, it is still only visible when it is in the background or padding area of the element. Thus, unless the image is tiled ("background-repeat: repeat"), it may be invisible.

User agents may treat fixed as scroll. However, it is recommended they interpret fixed correctly, at least for the HTML and BODY elements, since there is no way for an author to provide an image only for those browsers that support fixed. See the section on conformance for details.

XSL modifications to the CSS definition:

The last paragraph in the CSS description does not apply.

#### 7.6.2 "background-color"

CSS2 Definition:

Value: | <color> | transparent | inherit
Initial: | transparent
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background-color.

This property sets the background color of an element, either a <color> value or the keyword transparent, to make the underlying colors shine through.

transparent

  The underlying colors will shine through.

<color>

  Any valid color specification.

XSL modifications to the CSS definition:

XSL adds an "icc-color" function (see [5.10.2 Color Functions]) as a valid value of this property.

#### 7.6.3 "background-image"

CSS2 Definition:

Value: | <uri-specification> | none | inherit
Initial: | none
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background-image.

This property sets the background image of an element. When setting a "background-image", authors should also specify a background-color that will be used when the image is unavailable. When the image is available, it is rendered on top of the background color. (Thus, the color is visible in the transparent parts of the image).

Values for this property are either <uri-specification>, to specify the image, or "none", when no image is used.

none

  No image is specified.

<uri-specification>

XSL modifications to the CSS definition:

The <uri> value has been changed to a <uri-specification>.

#### 7.6.4 "background-repeat"

CSS2 Definition:

Value: | repeat | repeat-x | repeat-y | no-repeat | inherit
Initial: | repeat
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background-repeat.

If a background image is specified, this property specifies whether the image is repeated (tiled), and how. All tiling covers the content and padding areas of a box. Values have the following meanings:

repeat

  The image is repeated both horizontally and vertically.

repeat-x

  The image is repeated horizontally only.

repeat-y

  The image is repeated vertically only.

no-repeat

  The image is not repeated: only one copy of the image is drawn.

XSL modifications to the CSS definition:

"Horizontal" and "vertical" are defined relative to the reference-orientation; "horizontal" is "left" to "right", and "vertical" is "top" to "bottom".

> NOTE:

> Thus for a rotated area the tiling is also rotated. It is, however, independent of the writing-mode.

#### 7.6.5 "background-position-horizontal"

A Property Derived from a CSS2 Property.

Value: | <percentage> | <length> | left | center | right | inherit
Initial: | 0%
Applies to: | all formatting objects to which background applies
Inherited: | no
Percentages: | refer to the size of the padding-rectangle
Media: | visual

If a "background-image" has been specified, this property specifies its initial position horizontally.

<percentage>

  Specifies that a point, at the given percentage across the image from left-to-right, shall be placed at a point at the given percentage across, from left-to-right, the area's padding-rectangle.

  > NOTE:

  > For example with a value of 0%, the left-edge of the image is aligned with the left-edge of the area's padding-rectangle. A value of 100% places the right-edge of the image aligned with the right-edge of the padding-rectangle. With a value of 14%, a point 14% across the image is to be placed at a point 14% across the padding-rectangle.

<length>

  Specifies that the left-edge of the image shall be placed at the specified length to the right of the left-edge of the padding-rectangle.

  > NOTE:

  > For example with a value of 2cm, the left-edge of the image is placed 2cm to the right of the left-edge of the padding-rectangle.

left

  Same as 0%.

center

  Same as 50%.

right

  Same as 100%.

XSL modifications to the CSS definition:

"Left" and "right" are defined relative to the reference-orientation.

#### 7.6.6 "background-position-vertical"

A Property Derived from a CSS2 Property.

Value: | <percentage> | <length> | top | center | bottom | inherit
Initial: | 0%
Applies to: | all formatting objects to which background applies
Inherited: | no
Percentages: | refer to the size of the padding-rectangle
Media: | visual

If a "background-image" has been specified, this property specifies its initial position vertically.

<percentage>

  Specifies that a point, at the given percentage down the image from top-to-bottom, shall be placed at a point at the given percentage down, from top-to-bottom, the area's padding-rectangle.

  > NOTE:

  > For example with a value of 0%, the top-edge of the image is aligned with the top-edge of the area's padding-rectangle. A value of 100% places the bottom-edge of the image aligned with the bottom-edge of the padding-rectangle. With a value of 84%, a point 84% down the image is to be placed at a point 84% down the padding-rectangle.

<length>

  Specifies that the top-edge of the image shall be placed at the specified length below the top-edge of the padding-rectangle.

  > NOTE:

  > For example with a value of 2cm, the top-edge of the image is placed 2cm below the top-edge of the padding-rectangle.

top

  Same as 0%.

center

  Same as 50%.

bottom

  Same as 100%.

XSL modifications to the CSS definition:

"Top" and "bottom" are defined relative to the reference-orientation.

#### 7.6.7 "border-before-color"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the color of the border on the before-edge of a block-area or inline-area.

See definition of property border-top-color ([7.6.19 "border-top-color"]).

#### 7.6.8 "border-before-style"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-style> | inherit
Initial: | none
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-style for the before-edge.

See definition of property border-top-style ([7.6.20 "border-top-style"]).

#### 7.6.9 "border-before-width"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-width> | <length-conditional> | inherit
Initial: | medium
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-width for the before-edge.

See definition of property border-top-width ([7.6.21 "border-top-width"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the border for the before-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the border should be 0 or retained if its associated edge is a leading-edge in a reference-area for areas generated from this formatting object that have an is-first value of "false". See [4.3 Spaces and Conditionality] for further details. The initial value of the .conditionality component is "retain".

> NOTE:

> If the border-style is "none" the computed value of the width is forced to "0pt".

#### 7.6.10 "border-after-color"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the color of the border on the after-edge of a block-area or inline-area.

See definition of property border-top-color ([7.6.19 "border-top-color"]).

#### 7.6.11 "border-after-style"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-style> | inherit
Initial: | none
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-style for the after-edge.

See definition of property border-top-style ([7.6.20 "border-top-style"]).

#### 7.6.12 "border-after-width"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-width> | <length-conditional> | inherit
Initial: | medium
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-width for the after-edge.

See definition of property border-top-width ([7.6.21 "border-top-width"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the border for the after-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the border should be 0 or retained if its associated edge is a trailing-edge in a reference-area for areas generated from this formatting object that have an is-last value of "false". See [4.3 Spaces and Conditionality] for further details. The initial value of the .conditionality component is "retain".

> NOTE:

> If the border-style is "none" the computed value of the width is forced to "0pt".

#### 7.6.13 "border-start-color"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the color of the border on the start-edge of a block-area or inline-area.

See definition of property border-top-color ([7.6.19 "border-top-color"]).

#### 7.6.14 "border-start-style"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-style> | inherit
Initial: | none
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-style for the start-edge.

See definition of property border-top-style ([7.6.20 "border-top-style"]).

#### 7.6.15 "border-start-width"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-width> | <length-conditional> | inherit
Initial: | medium
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-width for the start-edge.

> NOTE:

> If the border-style is "none" the computed value of the width is forced to "0pt".

See definition of property border-top-width ([7.6.21 "border-top-width"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the border for the start-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the border should be 0 or retained if its associated edge is a leading-edge in a line-area for areas generated from this formatting object that have an is-first value of "false". See [4.3.1 Space-resolution Rules] for further details. The initial value of the .conditionality component is "discard".

#### 7.6.16 "border-end-color"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the color of the border on the end-edge of a block-area or inline-area.

See definition of property border-top-color ([7.6.19 "border-top-color"]).

#### 7.6.17 "border-end-style"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-style> | inherit
Initial: | none
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-style for the end-edge.

See definition of property border-top-style ([7.6.20 "border-top-style"]).

#### 7.6.18 "border-end-width"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <border-width> | <length-conditional> | inherit
Initial: | medium
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the border-width for the end-edge.

> NOTE:

> If the border-style is "none" the computed value of the width is forced to "0pt".

See definition of property border-top-width ([7.6.21 "border-top-width"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the border for the end-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the border should be 0 or retained if its associated edge is a trailing-edge in a line-area for areas generated from this formatting object that have an is-last value of "false". See [4.3.1 Space-resolution Rules] for further details. The initial value of the .conditionality component is "discard".

#### 7.6.19 "border-top-color"

CSS2 Definition:

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-top-color.

The 'border-color' property sets the color of the four borders. Values have the following meanings:

<color>

  Any valid color specification.

If an element's border color is not specified with a "border" property, user agents must use the value of the element's "color" property as the computed value for the border color.

#### 7.6.20 "border-top-style"

CSS2 Definition:

Value: | <border-style> | inherit
Initial: | none
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-top-style.

The border style properties specify the line style of a box's border (solid, double, dashed, etc.).

The properties defined in this section refer to the <border-style> value type, which may take one of the following:

none

  No border. This value forces the computed value of 'border-width' to be '0'.

hidden

  Same as 'none', except in terms of border conflict resolution for table elements.

dotted

  The border is a series of dots.

dashed

  The border is a series of short line segments.

solid

  The border is a single line segment.

double

  The border is two solid lines. The sum of the two lines and the space between them equals the value of 'border-width'.

groove

  The border looks as though it were carved into the canvas.

ridge

  The opposite of 'groove': the border looks as though it were coming out of the canvas.

inset

  The border makes the entire box look as though it were embedded in the canvas.

outset

  The opposite of 'inset': the border makes the entire box look as though it were coming out of the canvas.

All borders are drawn on top of the box's background. The color of borders drawn for values of 'groove', 'ridge', 'inset', and 'outset' depends on the element's 'color' property.

Conforming HTML user agents may interpret 'dotted', 'dashed', 'double', 'groove', 'ridge', 'inset', and 'outset' to be 'solid'.

#### 7.6.21 "border-top-width"

CSS2 Definition:

Value: | <border-width> | inherit
Initial: | medium
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-top-width.

The border width properties specify the width of the border area. The properties defined in this section refer to the <border-width> value type, which may take one of the following values:

thin

  A thin border.

medium

  A medium border.

thick

  A thick border.

<length>

  The border's thickness has an explicit value. Explicit border widths cannot be negative.

The interpretation of the first three values depends on the user agent. The following relationships must hold, however:

- 'thin' <='medium' <= 'thick'.

- Furthermore, these widths must be constant throughout a document.

#### 7.6.22 "border-bottom-color"

CSS2 Definition:

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-bottom-color.

Specifies the border color for the bottom-edge.

See definition of property border-top-color ([7.6.19 "border-top-color"]).

#### 7.6.23 "border-bottom-style"

CSS2 Definition:

Value: | <border-style> | inherit
Initial: | none
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-bottom-style.

Specifies the border style for the bottom-edge.

See definition of property border-top-style ([7.6.20 "border-top-style"]).

#### 7.6.24 "border-bottom-width"

CSS2 Definition:

Value: | <border-width> | inherit
Initial: | medium
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-bottom-width.

Specifies the border width for the bottom-edge.

See definition of property border-top-width ([7.6.21 "border-top-width"]).

#### 7.6.25 "border-left-color"

CSS2 Definition:

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-left-color.

Specifies the border color for the left-edge.

See definition of property border-top-color ([7.6.19 "border-top-color"]).

#### 7.6.26 "border-left-style"

CSS2 Definition:

Value: | <border-style> | inherit
Initial: | none
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-left-style.

Specifies the border style for the left-edge.

See definition of property border-top-style ([7.6.20 "border-top-style"]).

#### 7.6.27 "border-left-width"

CSS2 Definition:

Value: | <border-width> | inherit
Initial: | medium
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-left-width.

Specifies the border width for the left-edge.

See definition of property border-top-width ([7.6.21 "border-top-width"]).

#### 7.6.28 "border-right-color"

CSS2 Definition:

Value: | <color> | inherit
Initial: | the value of the 'color' property
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-right-color.

Specifies the border color for the right-edge.

See definition of property border-top-color ([7.6.19 "border-top-color"]).

#### 7.6.29 "border-right-style"

CSS2 Definition:

Value: | <border-style> | inherit
Initial: | none
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-right-style.

Specifies the border style for the right-edge.

See definition of property border-top-style ([7.6.20 "border-top-style"]).

#### 7.6.30 "border-right-width"

CSS2 Definition:

Value: | <border-width> | inherit
Initial: | medium
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-right-width.

Specifies the border width for the right-edge.

See definition of property border-top-width ([7.6.21 "border-top-width"]).

#### 7.6.31 "padding-before"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <padding-width> | <length-conditional> | inherit
Initial: | 0pt
Applies to: | see prose
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

Specifies the width of the padding on the before-edge of a block-area or inline-area.

See definition of property padding-top ([7.6.35 "padding-top"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the padding for the before-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the padding should be 0 or retained if its associated edge is a leading-edge in a reference-area for areas generated from this formatting object that have an is-first value of "false". See [4.3 Spaces and Conditionality] for further details. The initial value of the .conditionality component is "retain".

#### 7.6.32 "padding-after"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <padding-width> | <length-conditional> | inherit
Initial: | 0pt
Applies to: | see prose
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

Specifies the width of the padding on the after-edge of a block-area or inline-area.

See definition of property padding-top ([7.6.35 "padding-top"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the padding for the after-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the padding should be 0 or retained if its associated edge is a trailing-edge in a reference-area for areas generated from this formatting object that have an is-last value of "false". See [4.3 Spaces and Conditionality] for further details. The initial value of the .conditionality component is "retain".

#### 7.6.33 "padding-start"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <padding-width> | <length-conditional> | inherit
Initial: | 0pt
Applies to: | see prose
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

Specifies the width of the padding on the start-edge of a block-area or inline-area.

See definition of property padding-top ([7.6.35 "padding-top"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the padding for the start-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the padding should be 0 or retained if its associated edge is a leading-edge in a line-area for areas generated from this formatting object that have an is-first value of "false". See [4.3.1 Space-resolution Rules] for further details. The initial value of the .conditionality component is "discard".

#### 7.6.34 "padding-end"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | <padding-width> | <length-conditional> | inherit
Initial: | 0pt
Applies to: | see prose
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

Specifies the width of the padding on the end-edge of a block-area or inline-area.

See definition of property padding-top ([7.6.35 "padding-top"]).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<length-conditional>

  A compound value specifying the width and any conditionality of the padding for the end-edge.

  The .length component is a <length>. The .conditionality component may be set to "discard" or "retain" to control if the padding should be 0 or retained if its associated edge is a trailing-edge in a line-area for areas generated from this formatting object that have an is-last value of "false". See [4.3.1 Space-resolution Rules] for further details. The initial value of the .conditionality component is "discard".

#### 7.6.35 "padding-top"

CSS2 Definition:

Value: | <padding-width> | inherit
Initial: | 0pt
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-padding-top.

<length>

Specifies the width of the padding on the top-edge of a block-area or inline-area.

#### 7.6.36 "padding-bottom"

CSS2 Definition:

Value: | <padding-width> | inherit
Initial: | 0pt
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-padding-bottom.

Specifies the width of the padding on the bottom-edge of a block-area or inline-area.

See definition of property padding-top ([7.6.35 "padding-top"]).

#### 7.6.37 "padding-left"

CSS2 Definition:

Value: | <padding-width> | inherit
Initial: | 0pt
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-padding-left.

Specifies the width of the padding on the left-edge of a block-area or inline-area.

See definition of property padding-top ([7.6.35 "padding-top"]).

#### 7.6.38 "padding-right"

CSS2 Definition:

Value: | <padding-width> | inherit
Initial: | 0pt
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-padding-right.

Specifies the width of the padding on the right-edge of a block-area or inline-area.

See definition of property padding-top ([7.6.35 "padding-top"]).

### 7.7 Common Font Properties

The following common-font-properties all are taken from CSS2. The reference to CSS2 is: http://www.w3.org/TR/REC-CSS2/fonts.html

> NOTE:

> Although these properties reference the individual properties in the CSS specification, it is recommended that you read the entire font section of the CSS2 specification.

#### 7.7.1 Fonts and Font Data

XSL uses an abstract model of a font. This model is described in this section and is based on current font technology as exemplified by the OpenType specification [OpenType].

A font consists of a collection of glyphs together with the information, the font tables, necessary to use those glyphs to present characters on some medium. A glyph is a recognizable abstract graphic symbol which is independent of any specific design. The combination of the collection of glyphs and the font tables is called the font data.

The font tables include the information necessary to map characters to glyphs, to determine the size of glyph areas and to position the glyph area. Each font table consists of one or more font characteristics, such as the font-weight and font-style.

The geometric font characteristics are expressed in a coordinate system based on the EM box. (The EM is a relative measure of the height of the glyphs in the font; see [5.9.7.2 Relative Lengths].) This box that is 1 EM high and 1 EM wide is called the design space. Points in this design space are expressed in geometric coordinates in terms of fractional units of the EM.

The coordinate space of the EM box is called the design space coordinate system. For scalable fonts, the curves and lines that are used to draw a glyph are represented using this coordinate system.

> NOTE:

> Most often, the (0,0) point in this coordinate system is positioned on the left edge of the EM box, but not at the bottom left corner. The Y coordinate of the bottom of a Roman capital letter is usually zero. In addition, the descenders on lower case Roman letters have negative coordinate values.

XSL assumes that the font tables will provide at least three font characteristics: an ascent, a descent and a set of baseline-tables. The coordinate values for these are given in the design space coordinate system. The ascent is given by the vertical coordinate of the top of the EM box; the descent is given by the vertical coordinate of the bottom of the EM box. The baseline-table is explained below.

The glyphs of a given script are positioned so that a particular point on each glyph, the alignment-point, is aligned with the alignment-points of the other glyphs in that script. The glyphs of different scripts are typically aligned at different points on the glyph. For example, Western glyphs are aligned on the bottoms of the capital letters, certain Indic glyphs (including glyphs from the Devanagari, Gurmukhi and Bengali scripts) are aligned at the top of a horizontal stroke near the top of the glyphs and Far-Eastern glyphs are aligned either at the bottom or center of the EM box of the glyph. Within a script and within a line of text having a single font-size, the sequence of alignment-points defines, in the inline-progression-direction, a geometric line called a baseline. Western and most other alphabetic and syllabic glyphs are aligned to an "alphabetic" baseline, the above Indic glyphs are aligned to a "hanging" baseline and the Far-Eastern glyphs are aligned to an "ideographic" baseline.

This figure shows the vertical position of the alignment-point for alphabetic and many syllabic scripts, illustrated by a Roman "A"; for certain Indic scripts, illustrated by a Gurmukhi syllable "ji"; and for ideographic scripts, illustrated by the ideograhic glyph meaning "country". The thin black rectangle around the ideographic glyph illustrates the EM box for that glyph and shows the typical positioning of the "black marks" of the glyph within the EM box.

A baseline-table specifies the position of one or more baselines in the design space coordinate system. The function of the baseline table is to facilitate the alignment of different scripts with respect to each other when they are mixed on the same text line. Because the desired relative alignments may depend on which script is dominant in a line (or block), there may be a different baseline table for each script. In addition, different alignment positions are needed for horizontal and vertical writing modes. Therefore, the font may have a set of baseline tables: typically, one or more for horizontal writing-modes and zero or more for vertical writing-modes.

Examples of horizontal and vertical baseline positions. The thin lined box in each example is the "EM box". For the Latin glyphs, only the EM box of the first glyph is shown. Example 1 shows typical Latin text written horizontally. This text is positioned relative to the alphabetic baseline, shown in blue. Example 2 shows a typical ideographic glyph positioned on the horizontal ideographic baseline. Note that the EM Box is positioned differently for these two cases. Examples 3 and 4 show the same set of baselines used in vertical writing. The Latin text, example 3, is shown with a glyph-orientation of 90 degrees which is typical for proportionally space Latin glyphs in vertical writing. Even though the ideographic glyph in Example 4 is positioned on the vertical ideographic baseline, because it is centered in the EM box, all glyphs with the same EM Box are centered, vertically, with respect to one another. Additional examples showing the positioning of mixed scripts are given in the introductions to [7.12 Area Alignment Properties] and [7.26 Writing-mode-related Properties].

The font tables for a font include font characteristics for the individual glyphs in the font. XSL assumes that the font tables include, for each glyph in the font, one width value, one alignment-baseline and one alignment-point for the horizontal writing-modes. If vertical writing-modes are supported, then each glyph must have another width value, alignment-baseline and alignment-point for the vertical writing-modes. (Even though it is specified as a width, for vertical writing-modes the width is used in the vertical direction.)

The script to which a glyph belongs determines an alignment-baseline to which the glyph is to be aligned. The position of this baseline in the design space coordinate system determines the default block-progression-direction position of the alignment-point. The inline-progression-direction position of the alignment-point is on the start-edge of the glyph. (These positions are adjusted according to the specifications in [7.12.1 "alignment-adjust"] when an instance of a glyph is used in an inline or block formatting object. The "space-start" and/or the "space-end" properties of the fo:character that maps to the glyph may be adjusted to effect "kerning" with respect to adjacent glyphs.)

This figure shows glyphs from three different scripts, each with its EM box and within the EM box, the baseline table applicable to that glyph. The alignment-point of each glyph is shown by an "X" on the start edge of the EM box and by making alignment-baseline blue. The baseline-table of the parent formatting object of the characters that mapped to these glyphs is shown as a set of dashed lines.

In addition to the font characteristics required above, a font may also supply substitution and positioning tables that can be used by a formatter to re-order, combine, and position a sequence of glyphs to make one or more composite glyphs. The combination may be as simple as a ligature, or as complex as an Indic syllable which combines, usually with some re-ordering, multiple consonants and vowel glyphs. See [4.7.2 Line-building].

> NOTE:

> If the font tables do not define values for required font characteristics, heuristics may be used to approximate these values.

#### 7.7.2 "font-family"

CSS2 Definition:

Value: | [[ <family-name> | <generic-family> ],]* [<family-name> | <generic-family>] | inherit
Initial: | depends on user agent
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#propdef-font-family.

This property specifies a prioritized list of font family names and/or generic family names. To deal with the problem that a single font may not contain glyphs to display all the characters in a document, or that not all fonts are available on all systems, this property allows authors to specify a list of fonts, all of the same style and size, that are tried in sequence to see if they contain a glyph for a certain character. This list is called a font set.

The generic font family will be used if one or more of the other fonts in a font set is unavailable. Although many fonts provide the "missing character" glyph, typically an open box, as its name implies this should not be considered a match except for the last font in a font set.

There are two types of font family names:

<family-name>

  The name of a font-family of choice. In the previous example [in the CSS2 Recommendation], "Baskerville", "Heisi Mincho W3", and "Symbol" are font families. Font family names containing whitespace should be quoted. If quoting is omitted, any whitespace characters before and after the font name are ignored and any sequence of whitespace characters inside the font name is converted to a single space.

<generic-family>

  The following generic families are defined: "serif", "sans-serif", "cursive", "fantasy", and "monospace". Please see the section on generic font families for descriptions of these families. Generic font family names are keywords, and therefore must not be quoted.

XSL modifications to the CSS definition:

<string>

  The names are syntactically expressed as strings.

  > NOTE:

  > See the expression language for a two-argument "system-font" function that returns a characteristic of a system-font. This may be used, instead of the "font" shorthand, to specify the name of a system-font.

The second sentence of the second paragraph of the CSS2 definition is changed to: Although many fonts provide the "missing character" glyph, typically an open box, as its name implies this should not be considered a match.

#### 7.7.3 "font-selection-strategy"

XSL Definition:

Value: | auto | character-by-character | inherit
Initial: | auto
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

There is no XSL mechanism to specify a particular font; instead, a selected font is chosen from the fonts available to the User Agent based on a set of selection criteria. The selection criteria are the following font properties: "font-family", "font-style", "font-variant", "font-weight", "font-stretch", and "font-size", plus, for some formatting objects, one or more characters. These characters are called the contextual characters. The contextual characters can be as few as a single character and as many as the entire character complement of the result tree being processed.

Except for the fo:character formatting object, for all other formatting objects where "font-family" applies, the selection criteria consist of the above font properties only. For the fo:character formatting object, the selection criteria are these properties plus either the value of the "character" property of the fo:character alone or that character together with other contextual characters.

The strategy to be followed for selecting a font based on these criteria is specified by the "font-selection-strategy" property.

The "font-family" property is a prioritized list of font family names, which are tried in sequence to find an available font that matches the selection criteria. The font property selection criteria are matched if the corresponding font characteristics match the properties as specified in the property descriptions.

If no matching font is found, a fallback selection is determined in a system-dependent manner.

> NOTE:

> This fallback may be to seek a match using a User Agent default "font-family", or it may be a more elaborate fallback strategy where, for example, "Helvetica" would be used as a fallback for "Univers".

If no match has been found for a particular character, there is no selected font and the User Agent should provide a visual indication that a character is not being displayed (for example, using the 'missing character' glyph).

Values of the "font-selection-strategy" property have the following meanings:

auto

  The selection criterion given by the contextual characters is used in an implementation defined manner.

  > NOTE:

  > An implementation may, for example, use an algorithm where all characters in the result tree having the same set of font selection property values influence the selection, or it may only use the character property of a single fo:character formatting object for which a font is to be selected. Consider, for example, a case where the available fonts include a font that covers all of Latin, Greek and Cyrillic as well as three better quality fonts that cover those three separately, but match each other badly stylistically. An implementation that takes a larger view for its set of contextual characters may consider the glyph complement to allow the selection of the better font if it covers the glyph complement, but to use the broader font to get a consistent style if the glyph complement is larger than any one of the other fonts can cover.

character-by-character

  The set of contextual characters consists of the single character that is the value of the "character" property of the fo:character for which a font is to be selected.

  > NOTE:

  > This selection strategy is the same as the strategy used to select fonts in CSS.

Describes the criteria for selecting fonts and the different strategies for using these criteria to determine a selected font.

#### 7.7.4 "font-size"

CSS2 Definition:

Value: | <absolute-size> | <relative-size> | <length> | <percentage> | inherit
Initial: | medium
Applies to: | all elements
Inherited: | yes, the computed value is inherited
Percentages: | refer to parent element's font size
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#propdef-font-size.

This property describes the size of the font when set solid. Values have the following meanings:

<absolute-size>

  An <absolute-size> keyword refers to an entry in a table of font sizes computed and kept by the user agent. Possible values are:

  [ xx-small | x-small | small | medium | large | x-large | xx-large ]

  On a computer screen a scaling factor of 1.2 is suggested between adjacent indexes; if the "medium" font is 12pt, the "large" font could be 14.4pt. Different media may need different scaling factors. Also, the user agent should take the quality and availability of fonts into account when computing the table. The table may be different from one font family to another. Note. In CSS1, the suggested scaling factor between adjacent indexes was 1.5 which user experience proved to be too large.

<relative-size>

  A <relative-size> keyword is interpreted relative to the table of font sizes and the font size of the parent element. Possible values are:

  [ larger | smaller ]

  For example, if the parent element has a font size of "medium", a value of "larger" will make the font size of the current element be "large". If the parent element's size is not close to a table entry, the user agent is free to interpolate between table entries or round off to the closest one. The user agent may have to extrapolate table values if the numerical value goes beyond the keywords.

<length>

  A length value specifies an absolute font size (that is independent of the user agent's font table). Negative lengths are illegal.

<percentage>

  A percentage value specifies an absolute font size relative to the parent element's font size. Use of percentage values, or values in "em's", leads to more robust and cascadable stylesheets.

The actual value of this property may differ from the computed value due a numerical value on 'font-size-adjust' and the unavailability of certain font sizes.

Child elements inherit the computed 'font-size' value (otherwise, the effect of 'font-size-adjust' would compound).

XSL modifications to the CSS definition:

XSL incorporates the following text from CSS2 15.5 (http://www.w3.org/TR/REC-CSS2/fonts.html#algorithm") as part of the property definition.

'font-size' must be matched within a UA-dependent margin of tolerance. (Typically, sizes for scalable fonts are rounded the nearest whole pixel, while the tolerance for bitmapped fonts could be as large as 20%.) Further computations, e.g., by 'em' values in other properties, are based on the computed 'font-size' value.

#### 7.7.5 "font-stretch"

CSS2 Definition:

Value: | normal | wider | narrower | ultra-condensed | extra-condensed | condensed | semi-condensed | semi-expanded | expanded | extra-expanded | ultra-expanded | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#font-styling.

The 'font-stretch' property selects a normal, condensed, or extended face from a font family.

ultra-condensed
extra-condensed
condensed
semi-condensed
normal
semi-expanded
expanded
extra-expanded
ultra-expanded

  Absolute keyword values have the following ordering, from narrowest to widest :

  1. ultra-condensed

  2. extra-condensed

  3. condensed

  4. semi-condensed

  5. normal

  6. semi-expanded

  7. expanded

  8. extra-expanded

  9. ultra-expanded

wider

  The relative keyword "wider" sets the value to the next expanded value above the inherited value (while not increasing it above "ultra-expanded").

narrower

  The relative keyword "narrower" sets the value to the next condensed value below the inherited value (while not decreasing it below "ultra-condensed").

#### 7.7.6 "font-size-adjust"

CSS2 Definition:

Value: | <number> | none | inherit
Initial: | none
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#font-size-props.

In bicameral scripts, the subjective apparent size and legibility of a font are less dependent on their 'font-size' value than on the value of their 'x-height', or, more usefully, on the ratio of these two values, called the aspect value (font size divided by x-height). The higher the aspect value, the more likely it is that a font at smaller sizes will be legible. Inversely, faces with a lower aspect value will become illegible more rapidly below a given threshold size than faces with a higher aspect value. Straightforward font substitution that relies on font size alone may lead to illegible characters.

For example, the popular font Verdana has an aspect value of 0.58; when Verdana's font size 100 units, its x-height is 58 units. For comparison, Times New Roman has an aspect value of 0.46. Verdana will therefore tend to remain legible at smaller sizes than Times New Roman. Conversely, Verdana will often look 'too big' if substituted for Times New Roman at a chosen size.

This property allows authors to specify an aspect value for an element that will preserve the x-height of the first choice font in the substitute font. Values have the following meanings:

none

  Do not preserve the font's x-height.

<number>

  Specifies the aspect value. The number refers to the aspect value of the first choice font. The scaling factor for available fonts is computed according to the following formula:

  y(a/a') = c

  where:

  y="font-size" of first-choice font

  a' = aspect value of available font

  c="font-size" to apply to available font

This property allows authors to specify an aspect value for an element that will preserve the x-height of the first choice font in the substitute font.

Font size adjustments take place when computing the actual value of "font-size". Since inheritance is based on the computed value, child elements will inherit unadjusted values.

#### 7.7.7 "font-style"

CSS2 Definition:

Value: | normal | italic | oblique | backslant | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#font-styling.

The "font-style" property requests normal (sometimes referred to as "roman" or "upright"), italic, and oblique faces within a font family. Values have the following meanings:

normal

  Specifies a font that is classified as "normal" in the UA's font database.

oblique

  Specifies a font that is classified as "oblique" in the UA's font database. Fonts with Oblique, Slanted, or Incline in their names will typically be labeled "oblique" in the font database. A font that is labeled "oblique" in the UA's font database may actually have been generated by electronically slanting a normal font.

italic

  Specifies a font that is classified as "italic" in the UA's font database, or, if that is not available, one labeled 'oblique'. Fonts with Italic, Cursive, or Kursiv in their names will typically be labeled "italic".

XSL modifications to the CSS definition:

The following value type has been added for XSL:

backslant

  Specifies a font that is classified as "backslant" in the UA's font database.

XSL incorporates the following text from CSS2 15.5 (http://www.w3.org/TR/REC-CSS2/fonts.html#algorithm") as part of the property definition, except that for XSL the information is obtained from the font tables of the available fonts.

'italic' will be satisfied if there is either a face in the UA's font database labeled with the CSS keyword 'italic' (preferred) or 'oblique'. Otherwise the values must be matched exactly or font-style will fail.

#### 7.7.8 "font-variant"

CSS2 Definition:

Value: | normal | small-caps | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#font-styling.

In a small-caps font, the glyphs for lowercase letters look similar to the uppercase ones, but in a smaller size and with slightly different proportions. The "font-variant" property requests such a font for bicameral (having two cases, as with Roman script). This property has no visible effect for scripts that are unicameral (having only one case, as with most of the world's writing systems). Values have the following meanings:

normal

  Specifies a font that is not labeled as a small-caps font.

small-caps

  Specifies a font that is labeled as a small-caps font. If a genuine small-caps font is not available, user agents should simulate a small-caps font, for example by taking a normal font and replacing the lowercase letters by scaled uppercase characters. As a last resort, unscaled uppercase letter glyphs in a normal font may replace glyphs in a small-caps font so that the text appears in all uppercase letters.

Insofar as this property causes text to be transformed to uppercase, the same considerations as for "text-transform" apply.

XSL modifications to the CSS definition:

XSL incorporates the following text from CSS2 15.5 (http://www.w3.org/TR/REC-CSS2/fonts.html#algorithm") as part of the property definition.

'normal' matches a font not labeled as 'small-caps'; 'small-caps' matches (1) a font labeled as 'small-caps', (2) a font in which the small caps are synthesized, or (3) a font where all lowercase letters are replaced by uppercase letters. A small-caps font may be synthesized by electronically scaling uppercase letters from a normal font.

#### 7.7.9 "font-weight"

CSS2 Definition:

Value: | normal | bold | bolder | lighter | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#font-styling.

The "font-weight" property specifies the weight of the font.

normal

  Same as "400".

bold

  Same as "700".

bolder

  Specifies the next weight that is assigned to a font that is darker than the inherited one. If there is no such weight, it simply results in the next darker numerical value (and the font remains unchanged), unless the inherited value was "900", in which case the resulting weight is also "900".

lighter

  Specifies the next weight that is assigned to a font that is lighter than the inherited one. If there is no such weight, it simply results in the next lighter numerical value (and the font remains unchanged), unless the inherited value was "100", in which case the resulting weight is also "100".

<integer>

  These values form an ordered sequence, where each number indicates a weight that is at least as dark as its predecessor.

Child elements inherit the computed value of the weight.

XSL modifications to the CSS definition:

XSL incorporates the following text from CSS2 15.5.1 (http://www.w3.org/TR/REC-CSS2/fonts.html#q46) as part of the property definition.

The association of other weights within a family to the numerical weight values is intended only to preserve the ordering of weights within that family. User agents must map names to values in a way that preserves visual order; a face mapped to a value must not be lighter than faces mapped to lower values. There is no guarantee on how a user agent will map fonts within a family to weight values. However, the following heuristics tell how the assignment is done in typical cases: If the font family already uses a numerical scale with nine values (as e.g., OpenType does), the font weights should be mapped directly.

If there is both a face labeled Medium and one labeled Book, Regular, Roman or Normal, then the Medium is normally assigned to the '500'.

The font labeled "Bold" will often correspond to the weight value '700'.

If there are fewer then 9 weights in the family, the default algorithm for filling the "holes" is as follows. If '500' is unassigned, it will be assigned the same font as '400'. If any of the values '600', '700', '800', or '900' remains unassigned, they are assigned to the same face as the next darker assigned keyword, if any, or the next lighter one otherwise. If any of '300', '200', or '100' remains unassigned, it is assigned to the next lighter assigned keyword, if any, or the next darker otherwise.

There is no guarantee that there will be a darker face for each of the 'font-weight' values; for example, some fonts may have only a normal and a bold face, others may have eight different face weights.

### 7.8 Common Hyphenation Properties

#### 7.8.1 "country"

XSL Definition:

Value: | none | <country> | inherit
Initial: | none
Applies to: | fo:block, fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

none

  Indicates the country is unknown or is not significant to the proper formatting of this object.

<country>

  A country-specifier in conformance with [RFC1766].

Specifies the country to be used by the formatter in language-/locale-coupled services, such as line-justification strategy, line-breaking, and hyphenation.

> NOTE:

> This may affect line composition in a system-dependent way.

The country may be the country component of any RFC 1766 code; (these are derived from ISO 3166).

#### 7.8.2 "language"

XSL Definition:

Value: | none | <language> | inherit
Initial: | none
Applies to: | fo:block, fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

none

  Indicates the language is unknown or is not significant to the proper formatting of this object.

<language>

  A language-specifier in conformance with [RFC1766].

Specifies the language to be used by the formatter in language-/locale-coupled services, such as line-justification strategy, line-breaking, and hyphenation.

> NOTE:

> This may affect line composition in a system-dependent way.

The language may be the language component of any RFC 1766 code (these are derived from the ISO 639 language codes).

#### 7.8.3 "script"

XSL Definition:

Value: | none | auto | <script> | inherit
Initial: | auto
Applies to: | fo:block, fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  Indicates that the script is determined based on testing a character in the document against script identifiers assigned to Unicode codepoint ranges.

  For fo:character the character tested is given by the "character" property. For other formatting objects the character tested is the first character descendant, as determined by the pre-order traversal of the refined formatting object tree, which has an unambigous script identifier.

  > NOTE:

  > This provides the automatic differentiation between Kanji, Katakana, Hiragana, and Romanji used in JIS-4051 and similar services in some other countries/languages.

none

  Indicates the script is unknown or is not significant to the proper formatting of this object.

<script>

  A script specifier in conformance with [ISO15924].

Specifies the script to be used by the formatter in language-/locale-coupled services, such as line-justification strategy, line-breaking, and hyphenation.

> NOTE:

> This may affect line composition in a system-dependent way.

#### 7.8.4 "hyphenate"

XSL Definition:

Value: | false | true | inherit
Initial: | false
Applies to: | fo:block, fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

false

  Hyphenation may not be used in the line-breaking algorithm for the text contained in this object.

true

  Hyphenation may be used in the line-breaking algorithm for the text contained in this object.

Specifies whether hyphenation is allowed during line-breaking when the formatter is formatting this formatting object.

#### 7.8.5 "hyphenation-character"

XSL Definition:

Value: | <character> | inherit
Initial: | The Unicode hyphen character U+2010
Applies to: | fo:block, fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

<character>

Specifies the Unicode character to be presented when a hyphenation break occurs. The styling properties of this character are those inherited from its containing flow object.

#### 7.8.6 "hyphenation-push-character-count"

XSL Definition:

Value: | <number> | inherit
Initial: | 2
Applies to: | fo:block, fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

<integer>

  If a negative or non-integer value is specified, it will be rounded to the nearest integer greater than zero.

The hyphenation-push-character-count is a positive integer specifying the minimum number of characters in a hyphenated word after the hyphenation character. This is the minimum number of characters in the word pushed to the next line after the line ending with the hyphenation character.

#### 7.8.7 "hyphenation-remain-character-count"

XSL Definition:

Value: | <number> | inherit
Initial: | 2
Applies to: | fo:block, fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

<integer>

  If a negative or non-integer value is specified, it will be rounded to the nearest integer greater than zero.

The hyphenation-remain-character-count is a positive integer specifying the minimum number of characters in a hyphenated word before the hyphenation character. This is the minimum number of characters in the word left on the line ending with the hyphenation character.

### 7.9 Common Margin Properties-Block

#### 7.9.1 "margin-top"

CSS2 Definition:

Value: | <margin-width> | inherit
Initial: | 0
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-margin-top.

Margin-width may be one of the following:

auto

  See the CSS2 section on computing widths and margins for behavior.

<length>

  Specifies a fixed width.

<percentage>

  The percentage is calculated with respect to the width of the generated box's containing block. This is true for 'margin-top' and 'margin-bottom', except in the page context, where percentages refer to page box height.

Negative values for margin properties are allowed, but there may be implementation-specific limits.

Sets the top margin of a box.

XSL modifications to the CSS definition:

- Margin-top is provided for compatibility with CSS.

- Details on the mapping of CSS "margin" properties for XSL are given in [5 Property Refinement / Resolution].

#### 7.9.2 "margin-bottom"

CSS2 Definition:

Value: | <margin-width> | inherit
Initial: | 0
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-margin-bottom.

Margin-width may be one of the following:

auto

  See the CSS2 section on computing widths and margins for behavior.

<length>

  Specifies a fixed width.

<percentage>

  The percentage is calculated with respect to the width of the generated box's containing block. This is true for 'margin-top' and 'margin-bottom', except in the page context, where percentages refer to page box height.

Negative values for margin properties are allowed, but there may be implementation-specific limits.

Sets the bottom margin of a box.

XSL modifications to the CSS definition:

- Margin-bottom is provided for compatibility with CSS.

- Details on the mapping of CSS "margin" properties for XSL are given in [5 Property Refinement / Resolution].

#### 7.9.3 "margin-left"

CSS2 Definition:

Value: | <margin-width> | inherit
Initial: | 0pt
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-margin-left.

Margin-width may be one of the following:

auto

  See the CSS2 section on computing widths and margins for behavior.

<length>

  Specifies a fixed width.

<percentage>

  The percentage is calculated with respect to the width of the generated box's containing block.

Negative values for margin properties are allowed, but there may be implementation-specific limits.

Sets the left margin of a box.

XSL modifications to the CSS definition:

- Margin-left is provided for compatibility with CSS.

- Details on the mapping of CSS "margin" properties for XSL are given in [5 Property Refinement / Resolution].

#### 7.9.4 "margin-right"

CSS2 Definition:

Value: | <margin-width> | inherit
Initial: | 0pt
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-margin-right.

Margin-width may be one of the following:

auto

  See the CSS2 section on computing widths and margins for behavior.

<length>

  Specifies a fixed width.

<percentage>

  The percentage is calculated with respect to the width of the generated box's containing block.

Negative values for margin properties are allowed, but there may be implementation-specific limits.

Sets the right margin of a box.

XSL modifications to the CSS definition:

- Margin-right is provided for compatibility with CSS.

- Details on the mapping of CSS "margin" properties for XSL are given in [5 Property Refinement / Resolution].

#### 7.9.5 "space-before"

XSL Definition:

Value: | <space> | inherit
Initial: | space.minimum=0pt, .optimum=0pt, .maximum=0pt, .conditionality=discard, .precedence=0
Applies to: | all block-level formatting objects
Inherited: | no
Percentages: | N/A (Differs from margin-top in CSS)
Media: | visual

Values have the following meanings:

<space>

  Specifies the minimum, optimum, and maximum values for the space before any areas generated by this formatting object and the conditionality and precedence of this space.

Specifies the value of the space-specifier for the space before the areas generated by this formatting object. A definition of space-specifiers, and the interaction between space-specifiers occurring in sequence are given in [4.3 Spaces and Conditionality].

> NOTE:

> A common example of such a sequence is the "space-after" on one area and the "space-before" of its next sibling.

#### 7.9.6 "space-after"

XSL Definition:

Value: | <space> | inherit
Initial: | space.minimum=0pt, .optimum=0pt, .maximum=0pt, .conditionality=discard, .precedence=0
Applies to: | all block-level formatting objects
Inherited: | no
Percentages: | N/A (Differs from margin-bottom in CSS)
Media: | visual

Values have the following meanings:

<space>

  Specifies the minimum, optimum, and maximum values for the space after any areas generated by this formatting object and the conditionality and precedence of this space.

Specifies the value of the space-specifier for the space after the areas generated by this formatting object. A definition of space-specifiers, and the interaction between space-specifiers occurring in sequence are given in [4.3 Spaces and Conditionality].

> NOTE:

> A common example of such a sequence is the "space-after" on one area and the "space-before" of its next sibling.

#### 7.9.7 "start-indent"

XSL Definition:

Value: | <length> | inherit
Initial: | 0pt
Applies to: | all block-level formatting objects
Inherited: | yes
Percentages: | refer to width of containing reference-area
Media: | visual

Values have the following meanings:

<length>

  For each block-area generated by this formatting object, specifies the distance from the start-edge of the content-rectangle of the containing reference-area to the start-edge of the content-rectangle of that block-area.

This property may have a negative value, which indicates an outdent.

#### 7.9.8 "end-indent"

XSL Definition:

Value: | <length> | inherit
Initial: | 0pt
Applies to: | all block-level formatting objects
Inherited: | yes
Percentages: | refer to width of containing reference-area
Media: | visual

Values have the following meanings:

<length>

  For each block-area generated by this formatting object, specifies the distance from the end-edge of the content-rectangle of that block-area to the end-edge of the content-rectangle of the containing reference-area.

This property may have a negative value, which indicates an outdent.

### 7.10 Common Margin Properties-Inline

This group also includes all the properties in the common-margin-properties-block group except space-before, space-after, start-indent, and end-indent.

#### 7.10.1 "space-end"

XSL Definition:

Value: | <space> | inherit
Initial: | space.minimum=0pt, .optimum=0pt, .maximum=0pt, .conditionality=discard, .precedence=0
Applies to: | all inline-level formatting objects
Inherited: | no
Percentages: | refer to the width of the containing area
Media: | visual

Values have the following meanings:

<space>

  Specifies the minimum, optimum, and maximum values for the space after any areas generated by this formatting object and the conditionality and precedence of this space.

Specifies the value of the space-specifier for the space after the areas generated by this formatting object. A definition of space-specifiers, and the interaction between space-specifiers occurring in sequence are given in [4.3 Spaces and Conditionality].

> NOTE:

> A common example of such a sequence is the "space-end" on one area and the "space-start" of its next sibling.

#### 7.10.2 "space-start"

XSL Definition:

Value: | <space> | inherit
Initial: | space.minimum=0pt, .optimum=0pt, .maximum=0pt, .conditionality=discard, .precedence=0
Applies to: | all inline-level formatting objects
Inherited: | no
Percentages: | refer to the width of the containing area
Media: | visual

Values have the following meanings:

<space>

  Specifies the minimum, optimum, and maximum values for the space before any areas generated by this formatting object and the conditionality and precedence of this space.

Specifies the value of the space-specifier for the space before the areas generated by this formatting object. A definition of space-specifiers, and the interaction between space-specifiers occurring in sequence are given in [4.3 Spaces and Conditionality].

> NOTE:

> A common example of such a sequence is the "space-end" on one area and the "space-start" of its next sibling.

### 7.11 Common Relative Position Properties

This group also includes the top, right, bottom, and left properties from the common-absolute-position-properties group.

#### 7.11.1 "relative-position"

A Property Derived from a CSS2 Property.

Value: | static | relative | inherit
Initial: | static
Applies to: | all block-level and inline-level formatting objects
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

static

  The area is normally stacked.

relative

  The area's position is determined as if it was normally stacked. Only during rendering is the area rendered offset relative to this position. The fact that one area is relatively positioned does not influence the position on any other area.

  For areas that break over a page boundary, only the portion that would have been on a given page originally is included in the repositioned area on that page. Any portion of the repositioned area that was originally on the current page, but falls off the current page due to repositioning is "off" (typically clipped), thus does not fall onto any other page.

### 7.12 Area Alignment Properties

The area alignment properties control the alignment of child areas with respect to their parent areas. The parent area is given a frame of reference through its scaled-baseline-table.

The positions of these baselines are illustrated in the following figure:

This figure shows samples of Gurmukhi (a hanging Indic script), Latin and ideographic scripts together with most of the baselines defined below. The thin line around the ideographic glyphs symbolizes the EM box in which these glyphs are centered. In this figure, the position of the "text-before-edge" and "text-after-edge" baselines is computed assuming that the "alphabetic" baseline is the dominant-baseline. The "central" baseline has been omitted from the figure, but it lies halfway between the "text-before-edge" and "text-after-edge" baselines, just about where the "math" baseline is shown.

The baseline-identifiers below are used in this specification. Some of these are determined by baseline-tables contained in a font as described in [7.7.1 Fonts and Font Data]. Others are computed from other font characteristics as described below.

alphabetic

  This identifies the baseline used by most alphabetic and syllabic scripts. These include, but are not limited to, many Western, Southern Indic, Southeast Asian (non-ideographic) scripts.

ideographic

  This identifies the baseline used by ideographic scripts. For historical reasons, this baseline is at the bottom of the ideographic EM box and not in the center of the ideographic EM box. See the "central" baseline. The ideographic scripts include Chinese, Japanese, Korean, and Vietnamese Chu Nom.

hanging

  This identifies the baseline used by certain Indic scripts. These scripts include Devanagari, Gurmukhi and Bengali.

mathematical

  This identifies the baseline used by mathematical symbols.

central

  This identifies a computed baseline that is at the center of the EM box. This baseline lies halfway between the text-before-edge and text-after-edge baselines.

  > NOTE:

  > For ideographic fonts, this baseline is often used to align the glyphs; it is an alternative to the ideographic baseline.

middle

  This identifies a baseline that is offset from the alphabetic baseline in the shift-direction by 1/2 the value of the x-height font characteristic. The position of this baseline may be obtained from the font data or, for fonts that have a font characteristic for "x-height", it may be computed using 1/2 the "x-height". Lacking either of these pieces of information, the position of this baseline may be approximated by the "central" baseline.

text-before-edge

  This identifies the before-edge of the EM box. The position of this baseline may be specified in the baseline-table or it may be calculated.

  > NOTE:

  > The position of this baseline is normally around or at the top of the ascenders, but it may not encompass all accents that can appear above a glyph. For these fonts the value of the "ascent" font characteristic is used. For ideographic fonts, the position of this baseline is normally 1 EM in the shift-direction from the "ideographic" baseline. However, some ideographic fonts have a reduced width in the inline-progression-direction to allow tighter setting. When such a font, designed only for vertical writing-modes, is used in a horizontal writing-mode, the "text-before-edge" baseline may be less than 1 EM from the text-after-edge.

text-after-edge

  This identifies the after-edge of the EM box. The position of this baseline may be specified in the baseline-table or it may be calculated.

  > NOTE:

  > For fonts with descenders, the position of this baseline is normally around or at the bottom of the descenders. For these fonts the value of the "descent" font characteristic is used. For ideographic fonts, the position of this baseline is normally at the "ideographic" baseline.

There are, in addition, two computed baselines that are only defined for line areas. For each line-area, there is a dominant-baseline, a baseline-table and a baseline-table font-size which are those of the nearest ancestor formatting object that completely contains the whole line. The "before-edge" and "after-edge" baselines are defined as follows.

before-edge

  The offset of the "before-edge" baseline of the line from the dominant-baseline of the line is determined by ignoring all inline-areas whose alignment-baseline is either "before-edge" or "after-edge". For the "before-edge", extents are measured from the dominant-baseline in the direction toward the top of the reference-area. The top of the reference-area is defined by the reference-area's reference-orientation. The "before-edge" baseline offset is set to the maximum extent of the "before-edges" of the allocation-rectangles of the remaining areas. If all the inline-areas in a line-area are aligned either to the "before-edge" or to the "after-edge", then use the offset of the "text-before-edge" baseline of the line as the offset of the "before-edge" baseline of the line.

after-edge

  The offset of the "after-edge" baseline of the line from the dominant-baseline of the line is determined by ignoring all inline-areas whose alignment-baseline is `after-edge`. For the "after-edge", extents are measured from the dominant-baseline in the direction toward the bottom of the reference-area. The top of the reference-area is defined by the reference-area's reference-orientation. The "after-edge" baseline offset is set to the negative of the maximum of (1) the maximum extent of the "after-edges" of the allocation-rectangles of the remaining areas and (2) the maximum height of the allocation-rectangles of the areas that are ignored minus the offset of the "before-edge" baseline of the line.

  > NOTE:

  > If all the inline-areas in a line-area are aligned to the "after-edge" then the specification for the "before-edge" will set the "before-edge" baseline to coincide with the "text-before-baseline" of the line. Then, case (2) above will determine an offset to the "bottom-edge" baseline that will align the "before-edge" of the area with the greatest height to its allocation-rectangle to "before-edge" baseline.

  > NOTE:

  > The above specifications for "before-edge" and "after-edge" have the following three properties: (1) the allocation-rectangles of all the areas are below the "before-edge", (2) the allocation-rectangles of all the areas are above the "after-edge", and (3) the distance between the "before-edge" and the "after-edge" cannot be decreased without violating (1) or (2). The specified placement of the "before-edge" and "after-edge" is not the only way that (1)-(3) can be satisfied, but it is the only way they can be satisfied with the smallest possible offset to the "before-edge".

Examples showing "before-edge" and "after-edge" alignment:

The rectangles with lines or arrows are images with an intrinsic size as shown. The rectangles with no arrows represent images that receive the default, dominant baseline, alignment. The alignment of the other rectangles is at the furthest point from the arrow head (which is in the middle when there are two arrowheads). Examples 1 and 2 show the "before-edge" alignment is determined by the tallest non-"before-edge" aligned objects: in example 1 this is the default aligned, arrowhead free rectangular image and in example 2 this is the double headed arrow rectangle. Examples 3 and 4 show defaulting to the "text-before-edge" when all the areas have either "before-edge" or "after-edge" alignment. In example 3, the images with "before-edge" alignment has a taller member than do the "after-edge" aligned images. In example 4, the tallest image is in the "after-edge" aligned set. Example 5 is a repetition of example 2 with largest image being an "after-edge" aligned image.

There are also four baselines that are defined only for horizontal writing-modes.

top

  This baseline is the same as the "before-edge" baseline in a horizontal writing-mode and is undefined in a vertical writing mode.

text-top

  This baseline is the same as the "text-before-edge" baseline in a horizontal writing-mode and is undefined in a vertical writing mode.

bottom

  This baseline is the same as the "after-edge" baseline in a horizontal writing-mode and is undefined in a vertical writing mode.

text-bottom

  This baseline is the same as the "text-after-edge" baseline in a horizontal writing-mode and is undefined in a vertical writing mode.

The alignment of a formatting object with respect to its parent is determined by three things: the scaled-baseline-table of the parent and the alignment-baseline and alignment-point of the formatting object being aligned. Prior to alignment, the scaled-baseline-table of the parent may be shifted. The property specifications below provide the information necessary to align the parent and child formatting objects.

There are four properties that control alignment of formatting objects to the above set of baselines. These properties are all independent and are designed so that typically only the specification of one of the properties is needed to achieve a particular alignment goal.

The primary baseline alignment property is the "dominant-baseline" property. This property has a compound value with three components. The dominant-baseline-identifier component is the default alignment-baseline to be used when aligning two inline areas. The baseline-table component specifies the positions of the baselines in the font design space coordinates. (See [7.7.1 Fonts and Font Data].) The baseline-table acts something like a musical staff; it defines particular points along the block-progression-direction to which glyphs and inline formatting objects can be aligned. The baseline-table font-size component provides a scaling factor for the baseline-table.

For convenience, the specification will sometimes refer to the baseline identified by the dominant-baseline-identifier component of the "dominant-baseline" property as the "dominant baseline" (in an abuse of terminology).

A simple example of alignment is shown in the following figure. The figure shows the presentation of two inline formatting objects, one inside the other. These inline formatting objects make up the content of a line in a block where the writing-mode is "lr-tb" and the font is "Helvetica". The structure of the example is as follows:

    <fo:inline>Apex <fo:inline>Top</fo:inline></fo:inline>

Because no properties are specified, the initial values apply. Since a horizontal writing-mode is in use, the dominant-baseline-identifier is set to "alphabetic" and the baseline-table is taken from the nominal-font for the block in which the line appears, which, in this case, is Helvetica.

In the figure, the positions of the baselines relative to the current font size are shown as red (staff) lines. These lines are labeled with abbreviations of the names of the baselines (e.g., TBE for "text-before-edge"). The baseline identified by the dominant-baseline-identifier (A) is shown in blue. There is a break in the staff lines to separately show the inner inline formatting object. This is not necessary for this example, but this distinction will become important in subsequent examples.

The "alignment-baseline" property is the primary control on the positioning of an inner formatting object with respect to its parent. For all but fo:character, the initial value of the "alignment-baseline" property is "baseline". This aligns the dominant-baseline of the inner inline formatting object with the dominant baseline of the outer inline formatting object. This is shown by the short blue line that connects the two separated staffs (A) in the figure.

The glyphs determined by the fo:characters that are in the content of the two formatting objects are aligned based on the script to which the glyph belongs. Since this example only has Latin glyphs, they are aligned to the "alphabetic" baseline.

An inner inline formatting object containing Latin characters aligned to an outer inline formatting object also containing Latin characters.

In the next figure, the content of the inner inline formatting object is in Gurmukhi, the script of the Punjabi language. The Gurmukhi syllables are read as, "guru". Rather than use Unicode values for these characters, they are symbolized by placing the Latin transliteration in italic type. The structure of the example becomes:

    <fo:inline>Apex <fo:inline>guru</fo:inline></fo:inline>

The only change from the previous example is that the glyphs of the Gurmukhi script are aligned to the "hanging" baseline of the inner inline formatting object. The alignment of that formatting object itself, with respect to the outer inline formatting object, is unchanged.

An inner inline formatting object containing Gurmukhi characters aligned to an outer inline formatting object containing Latin characters.

In the next figure, fragments of the text of the previous examples make up the content of the outer inline formatting object. The inner inline formatting object has a change of font-size, however. The structure is:

    <fo:inline>Apguru
      <fo:inline font-size='.75em'>
        Exji
      </fo:inline>
    </fo:inline>

In this example, the alignment of the inner inline formatting object itself does not change, nor does the alignment of the smaller glyphs inside the inner formatting object. The Latin glyphs are still aligned to the "alphabetic" baseline and the Gurmukhi glyphs, which are pronounced "ji" are aligned to the "hanging" baseline. Note also that just changing the "font-size" property did not change the baseline-table in effect in the inner inline formatting object.

The inner inline formatting object has a reduced font-size.

The next figure is equivalent to the previous example with the Gurmukhi character replaced by ideographic characters. These are aligned to the "ideographic" baseline.

The previous figure re-done with ideographic glyphs instead of Gurmukhi glyphs. The EM boxes are shown for the ideograms to clarify the alignment of these glyphs.

To change the scaling of the lines of the baseline table, it is necessary to use the "dominant-baseline" property on the inner inline formatting object. The value of "reset-size" causes the baseline-table font-size to be reset from the font-size of the formatting object on which the "dominant-baseline" property appears. The next figure shows the effect of this, using the structure:

    <fo:inline>Apguru
      <fo:inline font-size='.75em'
                 dominant-baseline='reset-size'>
         Exji
      </fo:inline>
    </fo:inline>

The alignment of the inner inline formatting object, with respect to the outer inline formatting object, is still determined by aligning the dominant baselines. But, the baseline-table of the inner inline formatting object has been rescaled to the font-size of the inner inline formatting object. Hence the smaller glyphs align with each other.

The baseline-table of the inner inline formatting object has been re-sized to match the font-size of the inner inline formatting object.

But, what if it is more important that the small Gurmukhi glyphs align with the large Gurmukhi glyphs than having the Latin glyphs align. There are at least two ways to achieve this. The structure:

    <fo:inline dominant-baseline='hanging'>Apguru
      <fo:inline font-size='.75em'
                 dominant-baseline='reset-size'>
         Exji
      </fo:inline>
    </fo:inline>

is illustrated in the next figure. The "hanging" baseline becomes the dominant baseline and the initial value of the "alignment-baseline" property causes the (newly) dominant "hanging" baselines to be aligned as is shown by the connection of the blue baselines.

Changing the dominant baseline to the "hanging" baseline causes the inner inline formatting object to be aligned on its parent's "hanging" baseline.

It is also possible to achieve the effect of the above figure without changing the dominant baseline. Instead it is sufficient to explicitly specify that the inner inline formatting object is aligned on its "hanging" baseline. This is done by:

    <fo:inline>Apguru
      <fo:inline font-size='.75em'
                 dominant-baseline='reset-size'
                 alignment-baseline='hanging'>
         Exji
      </fo:inline>
    </fo:inline>

The only change this approach would make in the above figure is to color the "hanging" baseline red and keep the "alphabetic" baseline as the (blue) dominant baseline. This baseline in the inner inline formatting object would not (as it does not in the above figure) align with the "alphabetic" baseline in the outer inline formatting object.

The third baseline alignment property is the "baseline-shift" property. Like the properties other than the "dominant-baseline" property, this property does not change the baseline-table or the baseline-table font-size. It does shift the whole baseline table of the parent formatting object so that when an inner inline formatting object is aligned to one of the parents baselines, the position of the inner inline formatting object is shifted. This is illustrated in the next figure. The structure which creates this figure is:

    <fo:inline>Ap
      <fo:inline baseline-shift='super'>1ji</fo:inline>
    </fo:inline>

Because the whole set of baseline-table staff lines are shifted to the position of the superscript baseline: it does not matter to which baseline the glyphs in the superscript are aligned. The European number "1" is aligned to the "alphabetic" baseline and the Gurmukhi syllable "ji" is aligned to the "hanging" baseline.

Using a "baseline-shift" for a super-script (or a sub-script).

It is more common for the font-size of the super-script text to be smaller than the font-size of the text to which it is appended. Consider:

    <fo:inline>Ap
      <fo:inline font-size='.75em'
                 baseline-shift='super'>
        1ji
      </fo:inline>
    </fo:inline>

Because changing the font-size on a super-script (or sub-script) is common, this is the one case where changing the font-size does cause the baseline-table font-size to be reset when the "dominant-baseline" property has its initial value. After the rescaling, the default alignment to the dominant baseline positions the inline formatting object for the super-script to the dominant baseline position in the shifted baseline-table of the parent formatting object.

Reducing the font-size of the super-script automatically resets the baseline-table size so that mixed languages in the super-script stay mutually aligned.

The fourth alignment property is the "alignment-adjust" property. This property is primarily used for objects, such as some graphics, that do not belong to a particular script and do not have a predefined alignment point. The "alignment-adjust" property allows the author to assign where, on the start-edge of the object, the alignment point for that object lies.

#### 7.12.1 "alignment-adjust"

XSL Definition:

Value: | auto | baseline | before-edge | text-before-edge | middle | central | after-edge | text-after-edge | ideographic | alphabetic | hanging | mathematical | <percentage> | <length> | inherit
Initial: | auto
Applies to: | all inline formatting objects
Inherited: | no
Percentages: | see prose
Media: | visual

The "alignment-adjust" property allows more precise alignment of areas generated by formatting objects, in particular for formatting objects, such as graphics, that do not have a baseline-table or lack the desired baseline in their baseline-table. With the "alignment-adjust" property, the position of the baseline identified by the "alignment-baseline" can be explicitly determined.

Values for the property have the following meaning:

auto

  For a glyph, the alignment-point is the intersection of the start-edge of the allocation-rectangle of the glyph-area and the block-progression-direction position of the alignment-point from the font as specified in [7.7.1 Fonts and Font Data]. For other inline-areas, the alignment-point is at the intersection of the start-edge of the allocation-rectangle and the baseline identified by the "alignment-baseline" property if this baseline exists in the baseline-table for the dominant-baseline for the inline-area. If the baseline-identifier does not exist in the baseline-table for the glyph or other inline-area, then the User Agent may either use heuristics to determine where that missing baseline would be or may use the dominant-baseline as a fallback. For areas generated by a fo:external-graphic, or fo:instream-foreign-object, the alignment point is at the intersection of the start-edge and after-edge of the allocation-rectangle of the area.

baseline

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the dominant-baseline of the area.

before-edge

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "before-edge" baseline of the area.

text-before-edge

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "text-before-edge" baseline of the area.

central

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "central" baseline of the area.

middle

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "middle" baseline of the area.

after-edge

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "after-edge" baseline of the area.

text-after-edge

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "text-after-edge" baseline of the area.

ideographic

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "ideographic" baseline of the area.

alphabetic

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "alphabetic" baseline of the area.

hanging

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "hanging" baseline of the area.

mathematical

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "mathematical" baseline of the area.

top

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "top" baseline of the area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

bottom

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "bottom" baseline of the area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

text-top

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "text-top" baseline of the area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

text-bottom

  The alignment-point is at the intersection of the start-edge of the allocation-rectangle and the "text-bottom" baseline of the area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

<percentage>

  The computed value of the property is this percentage multiplied by the area's computed "height" if the area is generated by an fo:external-graphic or fo:instream-foreign-object, the "font-size" if the area was generated by an fo:character, and the "line-height" otherwise. The alignment-point is on the start-edge of the allocation-rectangle of the area being aligned. Its position along the start-edge relative to the intersection of the dominant-baseline and the start-edge is offset by the computed value. The offset is opposite to the shift-direction if that value is positive and in the shift-direction if that value is negative value). A value of "0%" makes the dominant-baseline the alignment point.

<length>

  The alignment-point is on the start-edge of the allocation-rectangle of the area being aligned. Its position along the start-edge relative to the intersection of the dominant-baseline and the start-edge is offset by <length> value. The offset is opposite to the shift-direction if that value is positive and in the shift-direction if that value is negative. A value of "0cm" makes the dominant-baseline the alignment point.

#### 7.12.2 "alignment-baseline"

XSL Definition:

Value: | auto | baseline | before-edge | text-before-edge | middle | central | after-edge | text-after-edge | ideographic | alphabetic | hanging | mathematical | inherit
Initial: | auto
Applies to: | all inline formatting objects
Inherited: | no
Percentages: | N/A
Media: | visual

This property specifies how an object is aligned with respect to its parent. That is, to which of the parent's baselines the alignment-point of this object is aligned. The alignment-adjust property specifies how the alignment point is determined. It defaults to the baseline with the same name as the computed value of the alignment-baseline property. That is, the position of "ideographic" alignment-point in the block-progression-direction is the position of the "ideographic" baseline in the baseline-table of the object being aligned.

Values have the following meanings:

auto

  The computed value depends on the kind of object on which it is being used. For fo:character, the value is the dominant-baseline of the script to which the character belongs. If the value of the "script" property on the parent formatting object is other than "auto" then use the baseline for that script; otherwise, use the dominant-baseline of the parent. For all other objects, the value is computed as for the "baseline" value.

baseline

  The alignment-point of the object being aligned is aligned with the dominant-baseline of the parent area.

before-edge

  The alignment-point of the object being aligned is aligned with the "before-edge" baseline of the parent area.

text-before-edge

  The alignment-point of the object being aligned is aligned with the "text-before-edge" baseline of the parent area.

central

  The alignment-point of the object being aligned is aligned with the "central" baseline of the parent area.

middle

  The alignment-point of the object being aligned is aligned with the "middle" baseline of the parent area.

after-edge

  The alignment-point of the object being aligned is aligned with the "after-edge" baseline of the parent area.

text-after-edge

  The alignment-point of the object being aligned is aligned with the "text-after-edge" baseline of the parent area.

ideographic

  The alignment-point of the object being aligned is aligned with the "ideographic" baseline of the parent area.

alphabetic

  The alignment-point of the object being aligned is aligned with the "alphabetic" baseline of the parent area.

hanging

  The alignment-point of the object being aligned is aligned with the "hanging" baseline of the parent area.

mathematical

  The alignment-point of the object being aligned is aligned with the "mathematical" baseline of the parent area.

top

  The alignment-point of the object being aligned is aligned with the "top" baseline of the parent area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

bottom

  The alignment-point of the object being aligned is aligned with the "bottom" baseline of the parent area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

text-top

  The alignment-point of the object being aligned is aligned with the "text-top" baseline of the parent area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

text-bottom

  The alignment-point of the object being aligned is aligned with the "text-bottom" baseline of the parent area if the writing-mode is horizontal. Otherwise, the dominant-baseline is used.

#### 7.12.3 "baseline-shift"

XSL Definition:

Value: | baseline | sub | super | <percentage> | <length> | inherit
Initial: | baseline
Applies to: | all inline formatting objects
Inherited: | no
Percentages: | refers to the "line-height" of the parent area
Media: | visual

The "baseline-shift" property allows repositioning of the dominant-baseline relative to the dominant-baseline of the parent area. The shifted object might be a sub- or superscript. Within the shifted object, the whole baseline-table is offset; not just a single baseline. The amount of the shift is determined from information from the parent area, the sub- or superscript offset from the nominal-font of the parent area, percent of the "line-height" of the parent area or an absolute value.

When the value of "baseline-shift" is other than "0", then the baseline-table font-size component of the "dominant-baseline" property is re-computed to use the "font-zise" applicable to the formatting object on which the non-zero "baseline-shift" property is specified.

Values for the property have the following meaning:

baseline

  There is no baseline shift; the dominant-baseline remains in its original position.

sub

  The dominant-baseline is shifted to the default position for subscripts. The offset to this position is determined using the font data for the nominal font. Because in most fonts the subscript position is normally given relative to the "alphabetic" baseline, the User Agent may compute the effective position for subscripts for superscripts when some other baseline is dominant. The suggested computation is to subtract the difference between the position of the dominant baseline and the position of the "alphabetic" baseline from the position of the subscript. The resulting offset is determined by multiplying the effective subscript position by the dominant baseline-table font-size. If there is no applicable font data the User Agent may use heuristics to determine the offset.

super

  The dominant-baseline is shifted to the default position for superscripts. The offset to this position is determined using the font data for the nominal font. Because in most fonts the superscript position is normally given relative to the "alphabetic" baseline, the User Agent may compute the effective position for superscripts when some other baseline is dominant. The suggested computation is to subtract the difference between the position of the dominant baseline and the position of the "alphabetic" baseline from the position of the superscript. The resulting offset is determined by multiplying the effective superscript position by the dominant baseline-table font-size. If there is no applicable font data the User Agent may use heuristics to determine the offset.

<percentage>

  The computed value of the property is this percentage multiplied by the computed "line-height" of the parent area. The dominant-baseline is shifted in the shift-direction (positive value) or opposite to the shift-direction (negative value) of the parent area by the computed value. A value of "0%" is equivalent to "baseline".

<length>

  The dominant-baseline is shifted in the shift-direction (positive value) or opposite to the shift-direction (negative value) of the parent area by the <length> value. A value of "0cm" is equivalent to "baseline".

> NOTE:

> Although it may seem that "baseline-shift" and "alignment-adjust" properties are doing the same thing, there is an important although, perhaps, subtle difference. For "alignment-adjust" the percentage values refer to the "line-height" of the area being aligned. For "baseline-shift" the percentage values refer to the "line-height" of the parent. Similarly, it is the "sub" and "super" offsets of the parent that are used to align the shifted baseline rather than the "sub" or "super" offsets of the areas being positioned. To ensure a consistent sub- or superscript position, it makes more sense to use the parent as the reference rather than the subscript formatting object which may have a changed "line-height" due to "font-size" changes in the sub- or superscript formatting object.

> Using the "alignment-adjust" property is more suitable for positioning objects, such as graphics, that have no internal textual structure. Using the "baseline-shift" property is intended for sub- and superscripts where the positioned object may itself be a textual object. The baseline-shift provides a way to define a specific baseline offset other than the named offsets that are defined relative to the dominant-baseline. In addition, having "baseline-shift" makes it easier for tool to generate the relevant properties; many formatting programs already have a notion of baseline shift.

#### 7.12.4 "display-align"

XSL Definition:

Value: | auto | before | center | after | inherit
Initial: | auto
Applies to: | fo:table-cell, fo:region-body, fo:region-before, fo:region-after, fo:region-start, fo:region-end
Inherited: | yes
Percentages: | N/A
Media: | visual

This property specifies the alignment, in the block-progression-direction, of the areas that are the children of a reference-area.

Values for the property have the following meaning:

auto

  If the "relative-align" property applies to this formatting object the "relative-align" property is used. If not, this value is treated as if "before" had been specified.

before

  The before-edge of the allocation-rectangle of the first child area is placed coincident with the before-edge of the content-rectangle of the reference-area.

center

  The child areas are placed such that the distance between the before-edge of the allocation-rectangle of the first child area and the before-edge of the content-rectangle of the reference-area is the same as the distance between the after-edge of the allocation-rectangle of the last child area and the after-edge of the content-rectangle of the reference-area.

after

  The after-edge of the allocation-rectangle of the last child area is placed coincident with the after-edge of the content-rectangle of the reference-area.

#### 7.12.5 "dominant-baseline"

XSL Definition:

Value: | auto | use-script | no-change | reset-size | ideographic | alphabetic | hanging | mathematical | inherit
Initial: | auto
Applies to: | all inline formatting objects
Inherited: | no
Percentages: | N/A
Media: | visual

The "dominant-baseline" property is used to determine or re-determine a scaled-baseline-table. A scaled-baseline-table is a compound value with three components: a baseline-identifier for the dominant-baseline, a baseline-table and a baseline-table font-size. Some values of the property re-determine all three values; other only re-establish the baseline-table font-size. When the initial value, "auto", would give an undesired result, this property can be used to explicitly set the desire scaled-baseline-table.

Values for the property have the following meaning:

auto

  If this property occurs on a block-level formatting object, then the computed value depends on the value of the "script" property. There are two cases. If the value of the "script" property is "auto", then, if the "writing-mode" is horizontal, then the value of the dominant-baseline component is "alphabetic", else if the "writing-mode" is vertical, then the value of the dominant-baseline component is "central". On the other hand, if the value of the "script" property is anything other than "auto", then the value of the "script" property is used to select the dominant baseline. The "writing-mode", whether horizontal or vertical, is used to select the baseline-table that corresponds to that baseline. The baseline-table font-size component is set to the value of the "font-size" property on the formatting object on which the "dominant-baseline" property occurs.

  Otherwise, if this property is not on a block-level formatting object, then the dominant-baseline and the baseline-table components remain the same as those of the parent formatting object. If the computed "baseline-shift" value actually shifts the baseline, then the baseline-table font-size component is set to the value of the "font-size" property on the formatting object on which the "dominant-baseline" property occurs, otherwise the baseline-table font-size remains the same as that of the parent formatting object. If there is no parent formatting object, the scaled-baseline-table value is constructed as above for block-level formatting-objects.

use-script

  The dominant-baseline and the baseline-table components are set using the value of the "script" property. The value of the "script" property is used to select the dominant baseline. The "writing-mode", whether horizontal or vertical, is used to select the appropriate set of baseline-tables and the dominant baseline is used to select the baseline-table that corresponds to that baseline. The baseline-table font-size component is set to the value of the "font-size" property on the formatting object on which the "dominant-baseline" property occurs.

no-change

  The dominant-baseline, the baseline-table, and the baseline-table font-size remain the same as that of the parent formatting object.

reset-size

  The dominant-baseline and the baseline-table remain the same, but the baseline-table font-size is changed to the value of the "font-size" property on this formatting object. This re-scales the baseline-table for the current "font-size".

ideographic

  The dominant-baseline is set to the "ideographic" baseline using the baseline-table and baseline-table font-size of the parent area, the baseline-table is changed to correspond to the "ideographic" baseline, and the baseline-table font-size is changed to the value of the "font-size" property on this formatting object.

alphabetic

  The dominant-baseline is set to the "alphabetic" baseline using the baseline-table and baseline-table font-size of the parent area, the baseline-table is changed to correspond to the "alphabetic" baseline, and the baseline-table font-size is changed to the value of the "font-size" property on this formatting object.

hanging

  The dominant-baseline is set to the "hanging" baseline using the baseline-table and baseline-table font-size of the parent area, the baseline-table is changed to correspond to the "hanging" baseline, and the baseline-table font-size is changed to the value of the "font-size" property on this formatting object.

mathematical

  The dominant-baseline is set to the "mathematical" baseline using the baseline-table and baseline-table font-size of the parent area, the baseline-table is changed to correspond to the "mathematical" baseline, and the baseline-table font-size is changed to the value of the "font-size" property on this formatting object.

If there is no baseline-table in the nominal font or if the baseline-table lacks an entry for the desired baseline, then the User Agent may use heuristics to determine the position of the desired baseline.

#### 7.12.6 "relative-align"

XSL Definition:

Value: | before | baseline | inherit
Initial: | before
Applies to: | fo:list-item, fo:table-cell
Inherited: | yes
Percentages: | N/A
Media: | visual

This property specifies the alignment, in the block-progression-direction, between two or more areas. If the "display-align" property applies to this formatting object and has a value other than "auto" this property is ignored.

Values for the property have the following meaning:

before

  For an fo:table-cell: for each row, the first child area of all the cells that start in the row and that have this value is placed such that the before-edge of the content-rectangle is placed at the same distance from the row grid. In addition, at least, one of these first child areas of the cells has to be placed with the before-edge of its allocation-rectangle coincident with the before-edge of the content-rectangle of the table-cell.

  For an fo:list-item the before-edge of the first area descendant generated by the fo:list-item-label is placed coincident with the before-edge of the area generated by the fo:list-item. Similarly the before-edge of the first area descendant generated by the fo:list-item-body is placed coincident with the before-edge of the area generated by the fo:list-item.

baseline

  For an fo:table-cell: for each row, the first child area of all the cells that start in the row and that have this value is placed such that the dominant-baseline, as specified on the fo:table-row, of the first line is placed at the same distance from the row grid. In addition, at least, one of these first child areas of the cells has to be placed with the before-edge of its allocation-rectangle coincident with the before-edge of the content-rectangle of the table-cell.

  > NOTE:

  > That is, for all applicable cells the baseline of all the first lines are all aligned and placed the minimum distance down in the block-progression-direction. It should be noted that the start-edges of the content-rectangles of the cells need not align.

  For an fo:list-item the distance between the baseline of the first line-area of the first area descendant generated by the fo:list-item-label is the same as the distance between the baseline of the first line-area of the first area descendant generated by the fo:list-item-body. In addition, at least, one of these first area descendants has to be placed such that the before-edge of its allocation-rectangle is coincident with the before-edge of the content-rectangle of the list-item.

### 7.13 Area Dimension Properties

#### 7.13.1 "block-progression-dimension"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | auto | <length> | <percentage> | <length-range> | inherit
Initial: | auto
Applies to: | see prose
Inherited: | no
Percentages: | see prose
Media: | visual

This property specifies the block-progression-dimension of the content-rectangle. The user may specify an explicit size (<length> or <percentage>) or a <length-range>, allowing the size to be adjusted by the formatter.

This property does not apply when the "line-height" property applies to the same dimension of the areas generated by this formatting object.

Values have the following meanings:

auto

  No constraint is imposed by this property. The block-progression-dimension is determined by the formatter taking all other constraints into account.

  Specifying block-progression-dimension="auto" will set:

  - block-progression-dimension.minimum="auto"

  - block-progression-dimension.optimum="auto"

  - block-progression-dimension.maximum="auto"

<length>

  Specifies a fixed block-progression-dimension.

  Specifying block-progression-dimension=<length> will set:

  - block-progression-dimension.minimum=<length>

  - block-progression-dimension.optimum=<length>

  - block-progression-dimension.maximum=<length>

<percentage>

  Specifies a percentage block-progression-dimension. The percentage is calculated with respect to the corresponding dimension of the closest area ancestor that was generated by a block-level formatting object. If that dimension is not specified explicitly (i.e., it depends on content's block-progression-dimension), the value is interpreted as "auto".

  Specifying block-progression-dimension=<percentage> will set:

  - block-progression-dimension.minimum=<percentage>

  - block-progression-dimension.optimum=<percentage>

  - block-progression-dimension.maximum=<percentage>

<length-range>

  Specifies the dimension as a length-range, consisting of:

  - block-progression-dimension.optimum

    This is the preferred dimension of the area created; if minimum and maximum are identical, the area is of a fixed dimension. If they are, respectively, smaller and larger than optimum, then the area may be adjusted in dimension within that range.

    A value of "auto" may be specified for optimum, indicating that there is no preferred dimension, but that the intrinsic or resolved dimension of the area should be used. If minimum and/or maximum are not also auto, then the dimension shall be constrained between those limits.

  - block-progression-dimension.minimum

  - block-progression-dimension.maximum

    A value of "auto" may be specified for block-progression-dimension.maximum. This indicates that there is no absolute maximum limit, and the object may be sized to its intrinsic size.

  Negative values for block-progression-dimension.minimum, block-progression-dimension.optimum, and block-progression-dimension.maximum are invalid and are treated as if "0pt" had been specified.

  If the computed value of block-progression-dimension.maximum is less than the computed value of block-progression-dimension.optimum, it is treated as if the value of block-progression-dimension.optimum had been specified.

  If the computed value of block-progression-dimension.minimum is greater than the computed value of block-progression-dimension.optimum, it is treated as if the value of block-progression-dimension.optimum had been specified.

  If the value of block-progression-dimension.optimum is "auto" and the computed value of block-progression-dimension.minimum is greater than the computed value of block-progression-dimension.maximum the block-progression-dimension.minimum is treated as if the value of block-progression-dimension.maximum had been specified.

#### 7.13.2 "content-height"

XSL Definition:

Value: | auto | scale-to-fit | <length> | <percentage> | inherit
Initial: | auto
Applies to: | fo:external-graphic, fo:instream-foreign-object
Inherited: | no
Percentages: | intrinsic height
Media: | visual

Values have the following meanings:

auto

  The content-height should be the intrinsic content-height.

scale-to-fit

  A size of the content-height equal to the height of the viewport. This value implies a certain scaling factor to be applied onto the content.

<length>

  An absolute size for the content-height. This value implies a certain scaling factor to be applied onto the content.

<percentage>

  A percentage representing a scaling factor for the content-height.

Specifies the content-height of some object (e.g., an external graphic). If the value is a percentage, the value of this property is the percentage applied to the intrinsic height.

#### 7.13.3 "content-width"

XSL Definition:

Value: | auto | scale-to-fit | <length> | <percentage> | inherit
Initial: | auto
Applies to: | fo:external-graphic, fo:instream-foreign-object
Inherited: | no
Percentages: | intrinsic height
Media: | visual

Values have the following meanings:

auto

  The content-width should be the intrinsic content-width.

scale-to-fit

  A size of the content-width equal to the height of the viewport. This value implies a certain scaling factor to be applied onto the content.

<length>

  An absolute size for the content-width. This value implies a certain scaling factor to be applied onto the content.

<percentage>

  A percentage representing a scaling factor for the content-width.

Specifies the content-width of some object (e.g., an external graphic). If the value is a percentage, the value of this property is the percentage applied to the intrinsic width.

#### 7.13.4 "height"

CSS2 Definition:

Value: | <length> | <percentage> | auto | inherit
Initial: | auto
Applies to: | all elements but non-replaced inline elements, table columns, and column groups
Inherited: | no
Percentages: | see prose
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-height.

This property specifies the content height of boxes generated by block-level and replaced elements.

This property does not apply to non-replaced inline-level elements. The height of a non-replaced inline element's boxes is given by the element's (possibly inherited) 'line-height' value.

Values have the following meanings:

auto

  The height depends on the values of other properties.

<length>

  Specifies a fixed height.

<percentage>

  Specifies a percentage height. The percentage is calculated with respect to the height of the generated box's containing block. If the height of the containing block is not specified explicitly (i.e., it depends on content height), the value is interpreted like "auto".

Negative values for 'height' are illegal.

XSL modifications to the CSS definition:

In XSL, this property is mapped to either "inline-progression-dimension" or "block-progression-dimension", based on the applicable values of the "writing-mode" and "reference-orientation" properties. Details on the mapping are given in [5 Property Refinement / Resolution].

For a discussion of the "height" property in tables see: http://www.w3.org/TR/REC-CSS2/tables.html

#### 7.13.5 "inline-progression-dimension"

Writing-mode Relative Equivalent of a CSS2 Property.

Value: | auto | <length> | <percentage> | <length-range> | inherit
Initial: | auto
Applies to: | see prose
Inherited: | no
Percentages: | see prose
Media: | visual

This property specifies the inline-progression-dimension of the content-rectangle. The user may specify an explicit size (<length> or <percentage>) or a <length-range>, allowing the size to be adjusted by the formatter.

This property does not apply when the "line-height" property applies to the same dimension of the areas generated by this formatting object.

Values have the following meanings:

auto

  No constraint is imposed by this property. The block-progression-dimension is determined by the formatter taking all other constraints into account.

  Specifying inline-progression-dimension=auto will set:

  - inline-progression-dimension.minimum=auto

  - inline-progression-dimension.optimum=auto

  - inline-progression-dimension.maximum=auto

<length>

  Specifies a fixed inline-progression-dimension.

  Specifying inline-progression-dimension=<length> will set:

  - inline-progression-dimension.minimum=<length>

  - inline-progression-dimension.optimum=<length>

  - inline-progression-dimension.maximum=<length>

<percentage>

  Specifies a percentage inline-progression-dimension. The percentage is calculated with respect to the corresponding dimension of the closest area ancestor that was generated by a block-level formatting object. If that dimension is not specified explicitly (i.e., it depends on content's inline-progression-dimension), the value is interpreted as "auto".

  Specifying inline-progression-dimension=<percentage> will set:

  - inline-progression-dimension.minimum=<percentage>

  - inline-progression-dimension.optimum=<percentage>

  - inline-progression-dimension.maximum=<percentage>

<length-range>

  Specifies the dimension as a length-range, consisting of:

  - inline-progression-dimension.optimum

    This is the preferred dimension of the area created, if minimum and maximum are identical, the area is of a fixed dimension. If they are, respectively, smaller and larger than optimum, then the area may be adjusted in dimension within that range.

    A value of "auto" may be specified for optimum, indicating that there is no preferred dimension, but that the intrinsic or resolved dimension of the area should be used. If minimum and/or maximum are not also auto, then the dimension shall be constrained between those limits.

  - inline-progression-dimension.minimum

  - inline-progression-dimension.maximum

    A value of "auto" may be specified for inline-progression-dimension.maximum. This indicates that there is no absolute maximum limit, and the object may be sized to its intrinsic size.

  Negative values for inline-progression-dimension.minimum, inline-progression-dimension.optimum, and inline-progression-dimension.maximum are invalid and are treated as if "0pt" had been specified.

  If the computed value of inline-progression-dimension.maximum is less than the computed value of inline-progression-dimension.optimum, it is treated as if the value of inline-progression-dimension.optimum had been specified.

  If the computed value of inline-progression-dimension.minimum is greater than the computed value of inline-progression-dimension.optimum, it is treated as if the value of inline-progression-dimension.optimum had been specified.

#### 7.13.6 "max-height"

CSS2 Definition:

Value: | <length> | <percentage> | none | inherit
Initial: | 0pt
Applies to: | all elements except non-replaced inline elements and table elements
Inherited: | no
Percentages: | refer to height of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-max-height.

These two properties ["max-height" and "max-width"] allow authors to constrain box heights to a certain range. Values have the following meanings:

none

  (Only on "max-height") No limit on the height of the box.

<length>

  Specifies a fixed minimum or maximum computed height.

<percentage>

  Specifies a percentage for determining the computed value. The percentage is calculated with respect to the height of the generated box's containing block. If the height of the containing block is not specified explicitly (i.e., it depends on content height), the percentage value is interpreted like "auto".

XSL modifications to the CSS definition:

In XSL, this property is mapped to either "inline-progression-dimension" or "block-progression-dimension", based on the applicable values of the "writing-mode" and "reference-orientation" properties. Details on the mapping are given in [5 Property Refinement / Resolution].

#### 7.13.7 "max-width"

CSS2 Definition:

Value: | <length> | <percentage> | none | inherit
Initial: | none
Applies to: | all elements except non-replaced inline elements and table elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-max-width.

These two properties ["max-height" and "max-width"] allow authors to constrain box widths to a certain range. Values have the following meanings:

none

  (Only on "max-width") No limit on the width of the box.

<length>

  Specifies a fixed minimum or maximum computed width.

<percentage>

  Specifies a percentage for determining the computed value. The percentage is calculated with respect to the width of the generated box's containing block.

XSL modifications to the CSS definition:

In XSL, this property is mapped to either "inline-progression-dimension" or "block-progression-dimension", based on the applicable values of the "writing-mode" and "reference-orientation" properties. Details on the mapping are given in [5 Property Refinement / Resolution].

#### 7.13.8 "min-height"

CSS2 Definition:

Value: | <length> | <percentage> | inherit
Initial: | 0pt
Applies to: | all elements except non-replaced inline elements and table elements
Inherited: | no
Percentages: | refer to height of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-min-height.

XSL modifications to the CSS definition:

In XSL, this property is mapped to either "inline-progression-dimension" or "block-progression-dimension", based on the applicable values of the "writing-mode" and "reference-orientation" properties. Details on the mapping are given in [5 Property Refinement / Resolution].

#### 7.13.9 "min-width"

CSS2 Definition:

Value: | <length> | <percentage> | inherit
Initial: | depends on UA
Applies to: | all elements except non-replaced inline elements and table elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-min-width.

XSL modifications to the CSS definition:

In XSL, this property is mapped to either "inline-progression-dimension" or "block-progression-dimension", based on the applicable values of the "writing-mode" and "reference-orientation" properties. Details on the mapping are given in [5 Property Refinement / Resolution].

#### 7.13.10 "scaling"

XSL Definition:

Value: | uniform | non-uniform | inherit
Initial: | uniform
Applies to: | fo:external-graphic, fo:instream-foreign-object
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

uniform

  Scaling should preserve the aspect ratio.

non-uniform

  Scaling need not preserve the aspect ratio.

Specifies whether scaling needs to preserve the intrinsic aspect ratio.

#### 7.13.11 "scaling-method"

XSL Definition:

Value: | auto | integer-pixels | resample-any-method | inherit
Initial: | auto
Applies to: | fo:external-graphic, fo:instream-foreign-object
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  The User Agent is free to choose either resampling, integer scaling, or any other scaling method.

integer-pixels

  The User Agent should scale the image such that each pixel in the original image is scaled to the nearest integer number of device-pixels that yields an image less-then-or-equal-to the image size derived from the content-height, content-width, and scaling properties.

resample-any-method

  The User Agent should resample the supplied image to provide an image that fills the size derived from the content-height, content-width, and scaling properties. The user agent may use any sampling method.

This property is used to indicate a preference in the scaling/sizing tradeoff to be used when formatting bitmapped graphics.

> NOTE:

> This is defined as a preference to allow the user agent the flexibility to adapt to device limitations and to accommodate over-constrained situations involving min/max dimensions and scale factors.

#### 7.13.12 "width"

CSS2 Definition:

Value: | <length> | <percentage> | auto | inherit
Initial: | auto
Applies to: | all elements but non-replaced inline elements, table-rows, and row groups
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-width.

This property specifies the content width of boxes generated by block-level and replaced elements.

This property does not apply to non-replaced inline-level elements. The width of a non-replaced inline element's boxes is that of the rendered content within them (before any relative offset of children). Recall that inline boxes flow into line boxes. The width of line boxes is given by their containing block, but may be shorted by the presence of floats.

The width of a replaced element's box is intrinsic and may be scaled by the user agent if the value of this property is different than 'auto'.

Values have the following meanings:

auto

  The width depends on the values of other properties.

<length>

  Specifies a fixed width.

<percentage>

  Specifies a percentage width. The percentage is calculated with respect to the width of the generated box's containing block.

Negative values for "width" are illegal.

XSL modifications to the CSS definition:

In XSL, this property is mapped to either "inline-progression-dimension" or "block-progression-dimension", based on the applicable values of the "writing-mode" and "reference-orientation" properties. Details on the mapping are given in [5 Property Refinement / Resolution].

### 7.14 Block and Line-related Properties

#### 7.14.1 "hyphenation-keep"

XSL Definition:

Value: | auto | column | page | inherit
Initial: | auto
Applies to: | fo:block
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  No restriction applies. The word may be hyphenated at the end of any region.

column

  Both parts of a hyphenated word shall lie within a single column.

page

  Both parts of a hyphenated word shall lie within a single page.

Controls whether hyphenation can be performed on the last line that fits in a given reference-area.

#### 7.14.2 "hyphenation-ladder-count"

XSL Definition:

Value: | no-limit | <number> | inherit
Initial: | no-limit
Applies to: | fo:block
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

no-limit

  Any number of successive lines may be hyphenated.

<integer>

  An integer greater than or equal to 1.

Specifies a limit on the number of successive hyphenated line-areas the formatter may generate in a block-area.

#### 7.14.3 "last-line-end-indent"

XSL Definition:

Value: | <length> | <percentage> | inherit
Initial: | 0pt
Applies to: | fo:block
Inherited: | yes
Percentages: | width of containing block
Media: | visual

Values have the following meanings:

<length>

  The "last-line-end-indent" is specified as a length.

<percentage>

  The "last-line-end-indent" is specified as a percentage of the block's content-rectangle inline-progression-dimension.

Specifies an indent to be applied to the end-edge of the last (or only) line-area contained in a block-area. It is added to the block's end-edge. Positive values indent the edge, negative values outdent the edge.

#### 7.14.4 "line-height"

CSS2 Definition:

Value: | normal | <length> | <number> | <percentage> | <space> | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | refer to the font size of the element itself
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-line-height.

Values have the following meanings:

normal

  Tells user agents to set the computed value to a "reasonable" value based on the font size of the element. The value has the same meaning as <number>. We recommend a computed value for "normal" between 1.0 to 1.2.

<length>

  The box height is set to this length. Negative values are illegal.

<number>

  The computed value of the property is this number multiplied by the element's font size. Negative values are illegal. However, the number, not the computed value, is inherited.

<percentage>

  The computed value of the property is this percentage multiplied by the element's computed font size. Negative values are illegal.

If the property is set on a block-level element whose content is composed of inline-level elements, it specifies the minimal height of each generated inline box.

If the property is set on an inline-level element, it specifies the exact height of each box generated by the element. (Except for inline replaced elements, where the height of the box is given by the "height" property.)

When an element contains text that is rendered in more than one font, user agents should determine the "line-height" value according to the largest font size.

Generally, when there is only one value of "line-height" for all inline boxes in a paragraph (and no tall images), the above will ensure that baselines of successive lines are exactly "line-height" apart. This is important when columns of text in different fonts have to be aligned, for example in a table.

Note that replaced elements have a "font-size" and a "line-height" property, even if they are not used directly to determine the height of the box. The "font-size" is, however, used to define the "em" and "ex" units, and the "line-height" has a role in the "vertical-align" property.

XSL modifications to the CSS definition:

In XSL the "line-height" property is used in determining the half-leading trait.

XSL adds the following value with the following meanings:

<space>

  Specifies the minimum, optimum, and maximum values, the conditionality, and precedence of the "line-height" that is used in determining the half-leading.

  Negative values for line-height.minimum, line-height.optimum, and line-height.maximum are invalid and will be interpreted as 0pt.

  If the value of line-height.maximum is less than the value of line-height.optimum, it is treated as if the value of line-height.optimum had been specified. If the value of line-height.minimum is greater than the value of line-height.optimum, it is treated as if the value of line-height.optimum had been specified.

  The line-height.conditionality setting can be used to control the half-leading above the first line or after the last line that is placed in a reference-area.

  The line-height.precedence setting can be used to control the merging of the half-leading with other spaces.

If line-height is specified using <length>, <percentage>, or <number>, the formatter shall convert the single value to a space-specifier with the subfields interpreted as follows:

- line-height.minimum: the resultant computed value (as a length) of the <length>, <percentage>, or <number>.

- line-height.optimum: the resultant computed value (as a length) of the <length>, <percentage>, or <number>.

- line-height.maximum: the resultant computed value (as a length) of the <length>, <percentage>, or <number>.

- line-height.precedence: force.

- line-height.conditionality: retain

#### 7.14.5 "line-height-shift-adjustment"

XSL Definition:

Value: | consider-shifts | disregard-shifts | inherit
Initial: | consider-shifts
Applies to: | fo:block
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

consider-shifts

  In determining the line-height, include the adjusted top-edge and bottom-edge of any characters that have a baseline-shift.

disregard-shifts

  In determining the line-height, include the unshifted top-edge and bottom-edge of any characters that have a baseline-shift.

This property is used to control whether the line-height is adjusted for content that has a baseline-shift.

> NOTE:

> This property can be used to prevent superscript and subscript characters from disrupting the line-spacing.

#### 7.14.6 "line-stacking-strategy"

XSL Definition:

Value: | line-height | font-height | max-height | inherit
Initial: | line-height
Applies to: | fo:block
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

line-height

  Uses the per-inline-height-rectangle as described in [4.5 Line-areas].

  > NOTE:

  > This matches CSS's line-height and positioning strategy.

font-height

  Uses the nominal-requested-line-rectangle as described in [4.5 Line-areas].

max-height

  Uses the maximal-line-rectangle as described in [4.5 Line-areas].

Selects the strategy for positioning adjacent lines, relative to each other.

#### 7.14.7 "linefeed-treatment"

XSL Definition:

Value: | ignore | preserve | treat-as-space | treat-as-zero-width-space | inherit
Initial: | treat-as-space
Applies to: | see prose
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

ignore

  Specifies that any character flow object whose Unicode character code is U+000A shall be discarded.

preserve

  Specifies no special action.

treat-as-space

  Specifies that any character flow object whose Unicode character code is U+000A shall be treated by subsequent XSL processing (including collapsing) and the formatter as if its Unicode character code were U+0020.

treat-as-zero-width-space

  Specifies that any character flow object whose Unicode character code is U+000A shall be treated by subsequent XSL processing as if its Unicode character code were U+00200B.

  > NOTE:

  > The Unicode Standard recommends that the zero width space is considered a valid line-break point and that if two characters with a zero width space in between are placed on the same line they are placed with no space between them and that if they are placed on two lines no additional glyph area, such as for a hyphen, is created at the line-break.

The "linefeed-treatment" property specifies the treatment of linefeeds (U+000A characters).

#### 7.14.8 "space-treatment"

XSL Definition:

Value: | ignore | preserve | ignore-if-before-linefeed | ignore-if-after-linefeed | ignore-if-surrounding-linefeed | inherit
Initial: | preserve
Applies to: | see prose
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

ignore

  Specifies that any character flow object whose character is classified as "white space" in XML, except for U+000A (linefeed) characters (since their treatment is determine by the `linefeed-treatment` property), shall be discarded.

preserve

  Specifies no special action.

ignore-if-before-linefeed

  Specifies that any character flow object, or any sequence of character flow objects, whose character is classified as "white space" in XML, except for U+000A (linefeed) characters (since their treatment is determine by the linefeed-treatment property), that immediately precedes a linefeed character, shall be discarded. This action shall take place regardless of the setting of the linefeed-treatment property.

ignore-if-after-linefeed

  Specifies that any character flow object, or any sequence of character flow objects, whose character is classified as "white space" in XML, except for U+000A (linefeed) characters (since their treatment is determine by the linefeed-treatment property), that immediately follows a linefeed character, shall be discarded. This action shall take place regardless of the setting of the linefeed-treatment property.

ignore-if-surrounding-linefeed

  Specifies that any character flow object, or any sequence of character flow objects, whose character is classified as "white space" in XML, except for U+000A (linefeed) characters (since their treatment is determine by the linefeed-treatment property), that immediately precedes or follows a linefeed character, shall be discarded. This action shall take place regardless of the setting of the linefeed-treatment property.

The "space-treatment" property specifies the treatment of space (U+0020) and other whitespace characters except for linefeeds (U+000A characters).

#### 7.14.9 "text-align"

CSS2 Definition:

Value: | start | center | end | justify | inside | outside | left | right | <string> | inherit
Initial: | start
Applies to: | block-level elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-text-align.

This property describes how inline content of a block is aligned. Values have the following meanings:

left
center
right
justify

  Left, right, center, and double justify text, respectively.

<string>

  Specifies a string on which cells in a table column will align (see the section on horizontal alignment in a column for details and an example). This value applies only to table cells. If set on other elements, it will be treated as 'left' or 'right', depending on whether 'direction' is 'ltr', or 'rtl', respectively.

A block of text is a stack of line boxes. In the case of 'left', 'right' and 'center', this property specifies how the inline boxes within each line box align with respect to the line box's left and right sides; alignment is not with respect to the viewport. In the case of 'justify', the UA may stretch the inline boxes in addition to adjusting their positions. (See also 'letter-spacing' and 'word-spacing'.)

> NOTE:

> The actual justification algorithm used is user agent and written language dependent.

> Conforming user agents may interpret the value 'justify' as 'left' or 'right', depending on whether the element's default writing direction is left-to-right or right-to-left, respectively.

XSL modifications to the CSS definition:

Values have the following meanings:

start

  Specifies that the content is to be aligned on the start-edge in the inline-progression-direction.

center

  Specifies that the content is to be centered in the inline-progression-direction.

end

  Specifies that the content is to be aligned on the end-edge in the inline-progression-direction.

justify

  Specifies that the contents is to be expanded to fill the available width in the inline-progression-direction.

  The last (or only) line of any block, and any lines in the block ending in U+000A, will be aligned in accordance with the "text-align-last" property value. If such lines are to be justified specify "text-align-last='justify'".

inside

  If the page binding edge is on the start-edge, the alignment will be start. If the binding is the end-edge, the alignment will be end. If neither, use start alignment.

outside

  If the page binding edge is on the start-edge, the alignment will be end. If the binding is the end-edge, the alignment will be start. If neither, use end alignment.

left

  Interpreted as "text-align='start'".

right

  Interpreted as "text-align='end'".

<string>

  Specifies a string on which cells in a table column will align (see the section, in the CSS2 recommendation, on horizontal alignment in a column for details and an example). This value applies only to table cells. If set on other elements, it will be treated as "start".

This property describes how inline content of a block is aligned.

#### 7.14.10 "text-align-last"

XSL Definition:

Value: | relative | start | center | end | justify | inside | outside | left | right | inherit
Initial: | relative
Applies to: | fo:block
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

relative

  If text-align is justify, then the alignment of the last line, and of any line ending in U+000A, will be start. If text-align is not justify, text-align-last will use the value of text-align.

start

  Specifies that the content is to be aligned on the start-edge in the inline-progression-direction.

center

  Specifies that the contents is to be centered in the inline-progression-direction.

end

  Specifies that the content is to be aligned on the end-edge in the inline-progression-direction.

justify

  Specifies that the contents is to be expanded to fill the available width in the inline-progression-direction.

inside

  If the page binding edge is on the start-edge, the alignment will be start. If the binding is the end-edge, the alignment will be end. If neither, use start-side.

outside

  If the page binding edge is on the start-edge, the alignment will be end. If the binding is the end-edge the alignment will be start. If neither, use end alignment.

left

  Interpreted as "text-align-last='start'".

right

  Interpreted as "text-align-last='end'".

Specifies the alignment of the last line-area in a block, and any lines in the block ending in U+000A.

#### 7.14.11 "text-indent"

CSS2 Definition:

Value: | <length> | <percentage> | inherit
Initial: | 0pt
Applies to: | block-level elements
Inherited: | yes
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-text-indent.

This property specifies the indentation of the first line of text in a block. More precisely, it specifies the indentation of the first box that flows into the block's first line box. The box is indented with respect to the left (or right, for right-to-left layout) edge of the line box. User agents should render this indentation as blank space.

Values have the following meanings:

<length>

  The indentation is a fixed length.

<percentage>

  The indentation is a percentage of the containing block width

The value of 'text-indent' may be negative, but there may be implementation-specific limits.

XSL modifications to the CSS definition:

The "text-indent" property specifies an adjustment to the start-indent of the first line-area in a block-area. This indent is added to the block's start-indent.

A negative value specifies a hanging indent (outdent) on the first line.

#### 7.14.12 "white-space-collapse"

XSL Definition:

Value: | false | true | inherit
Initial: | true
Applies to: | see prose
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

false

  Specifies no special action.

true

  Specifies, for any character flow object such that:

  - its character is classified as "white space" in XML, and

  - it is not a preserved linefeed (due to `linefeed-treatment="preserve"` ), and

  - the immediately preceding (non-ignored) flow object was a character flow object also with a character of class white-space or the immediately following (non-ignored) flow object is a preserved linefeed,

  that flow object shall be ignored.

The "white-space-collapse" property specifies the treatment of consecutive white-space. The effect is as follows: after all ignored white-space is discarded and all "treat-as-space" white-space is turned into a space, all resulting runs of two or more consecutive spaces are replaced by a single space, then any remaining space immediately adjacent to a remaining linefeed is also discarded. An implementation is free to use any algorithm to achieve an equivalent effect.

#### 7.14.13 "wrap-option"

XSL Definition:

Value: | no-wrap | wrap | inherit
Initial: | wrap
Applies to: | see prose
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

nowrap

  No line-wrapping will be performed.

  In the case when lines are longer than the available width of the content-rectangle, the overflow will be treated in accordance with the "overflow" property specified on the reference-area.

wrap

  Line-breaking will occur if the line overflows the available block width. No special markers or other treatment will occur.

Specifies how line-wrapping (line-breaking) of the content of the formatting object is to be handled.

### 7.15 Character Properties

#### 7.15.1 "character"

XSL Definition:

Value: | <character>
Initial: | N/A, value is required
Applies to: | fo:character
Inherited: | no, a value is required
Percentages: | N/A
Media: | visual

Values have the following meanings:

<character>

Specifies the Unicode character to be presented.

#### 7.15.2 "letter-spacing"

CSS2 Definition:

Value: | normal | <length> | <space> | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-letter-spacing.

This property specifies spacing behavior between text characters. Values have the following meanings:

normal

  The spacing is the normal spacing for the current font. This value allows the user agent to alter the space between characters in order to justify text.

<length>

  This value indicates inter-character space in addition to the default space between characters. Values may be negative, but there may be implementation-specific limits. User agents may not further increase or decrease the inter-character space in order to justify text.

Character-spacing algorithms are user agent dependent. Character spacing may also be influenced by justification (see the "text-align" property).

When the resultant space between two characters is not the same as the default space, user agents should not use ligatures.

Conforming user agents may consider the value of the 'letter-spacing' property to be 'normal'.

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<space>

  This allows the user to specify a range of adjustments in addition to the default space between characters.

  The minimum and maximum values specify the limits of the adjustment.

Default space between characters is defined to be 0pt, i.e., glyph-areas stacked with no extra space between the allocation-rectangles of the glyph-areas. The inline-progression-dimension of the glyph-area is obtained by formatting the fo:character.

For an fo:character that in the Unicode database is classified as "Alphabetic" the start-space and end-space traits are each set to a value as follows:

- For "normal": .optimum = "the normal spacing for the current font" / 2, .maximum = auto, .minimum = auto, .precedence = force, and .conditionality = discard. A value of auto for a component implies that the limits are User Agent specific.

- For a <length>: .optimum = <length> / 2, .maximum = .optimum, .minimum = .optimum, .precedence = force, and .conditionality = discard.

- For a <space>: a value that is half the value of the "letter-spacing" property for the numeric components and the value for the .precedence and .conditionality components. The initial values for .precedence is "force" and for .conditionality "discard".

The CSS statement that "Conforming user agents may consider the value of the 'letter-spacing' property to be 'normal'." does not apply in XSL, if the User Agent implements the "Extended" property set.

> NOTE:

> If it is desired that the letter-space combine with other spaces that have less than forcing precedence, then the value of the letter-space should be specified as a <space> with precedence less than force which implies that space combines according to the space resolution rules described in [4.3 Spaces and Conditionality].

The algorithm for resolving the adjusted values between word-spacing and letter-spacing is User Agent dependent.

#### 7.15.3 "suppress-at-line-break"

XSL Definition:

Value: | auto | suppress | retain | inherit
Initial: | auto
Applies to: | fo:character
Inherited: | no
Percentages: | N/A
Media: | visual

This property applies only to fo:character and determines whether the character's representation shall be suppressed when it would occur adjacent to a formatter-generated line break. Multiple characters may be so suppressed.

This property has the following values:

auto

  The value of this property is determined by the Unicode value of the object's character property. The character at codepoint U+0020 is treated as if 'suppress' had been specified. All other characters are treated as if 'retain' had been specified.

  This value does not automatically suppress the presentation of the non-breaking-space (U+00A0), the fixed spaces (U+2000 through U+200A), or the ideographic-space (U+3000).

suppress

  If the glyph-area generated by the fo:character is first or last in a line-building partition (see section [4.7.2 Line-building]) then it is deleted rather than being placed in the area tree, together with all adjacent areas with a suppress-at-line-break value of `suppress`. Otherwise it is retained and placed in the area tree.

retain

  The glyph-area generated by the fo:character shall be placed in the area tree whether or not it is first or last in a line-building partition.

#### 7.15.4 "text-decoration"

CSS2 Definition:

Value: | none | [ [ underline | no-underline] || [ overline | no-overline ] || [ line-through | no-line-through ] || [ blink | no-blink ] ] | inherit
Initial: | none
Applies to: | all elements
Inherited: | no, but see prose
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-text-decoration.

This property describes decorations that are added to the text of an element. If the property is specified for a block-level element, it affects all inline-level descendants of the element. If it is specified for (or affects) an inline-level element, it affects all boxes generated by the element. If the element has no content or no text content (e.g., the IMG element in HTML), user agents must ignore this property.

Values have the following meanings:

none

  Produces no text decoration.

underline

  Each line of text is underlined.

overline

  Each line of text has a line above it.

line-through

  Each line of text has a line through the middle

blink

  Text blinks (alternates between visible and invisible). Conforming user agents are not required to support this value.

The color(s) required for the text decoration should be derived from the "color" property value.

This property is not inherited, but descendant boxes of a block box should be formatted with the same decoration (e.g., they should all be underlined). The color of decorations should remain the same even if descendant elements have different "color" values.

XSL modifications to the CSS definition:

XSL adds the following values with the following meanings:

no-underline

  Turns off underlining, if any.

no-overline

  Turns off overlining, if any.

no-line-through

  Turns off line-through, if any.

no-blink

  Turns off blinking, if any.

#### 7.15.5 "text-shadow"

CSS2 Definition:

Value: | none | [<color> || <length> <length> <length>? ,]* [<color> || <length> <length> <length>?] | inherit
Initial: | none
Applies to: | all elements
Inherited: | no, see prose
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-text-shadow.

This property accepts a comma-separated list of shadow effects to be applied to the text of the element. The shadow effects are applied in the order specified and may thus overlay each other, but they will never overlay the text itself. Shadow effects do not alter the size of a box, but may extend beyond its boundaries. The stack level of the shadow effects is the same as for the element itself.

Each shadow effect must specify a shadow offset and may optionally specify a blur radius and a shadow color.

A shadow offset is specified with two "length" values that indicate the distance from the text. The first length value specifies the horizontal distance to the right of the text. A negative horizontal length value places the shadow to the left of the text. The second length value specifies the vertical distance below the text. A negative vertical length value places the shadow above the text.

A blur radius may optionally be specified after the shadow offset. The blur radius is a length value that indicates the boundaries of the blur effect. The exact algorithm for computing the blur effect is not specified.

A color value may optionally be specified before or after the length values of the shadow effect. The color value will be used as the basis for the shadow effect. If no color is specified, the value of the "color" property will be used instead.

#### 7.15.6 "text-transform"

CSS2 Definition:

Value: | capitalize | uppercase | lowercase | none | inherit
Initial: | none
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-text-transform.

This property controls capitalization effects of an element's text. Values have the following meanings:

capitalize

  Puts the first character of each word in uppercase.

uppercase

  Puts all characters of each word in uppercase.

lowercase

  Puts all characters of each word in lowercase.

none

  No capitalization effects.

The actual transformation in each case is written language dependent. See [RFC2070] for ways to find the language of an element.

Conforming user agents may consider the value of "text-transform" to be "none" for characters that are not from the ISO Latin-1 repertoire and for elements in languages for which the transformation is different from that specified by the case-conversion tables of Unicode or ISO 10646.

XSL modifications to the CSS definition:

There are severe internationalization issues with the use of this property. It has been retained for CSS compatibility, but its use is not recommended in XSL.

#### 7.15.7 "treat-as-word-space"

XSL Definition:

Value: | auto | true | false | inherit
Initial: | auto
Applies to: | fo:character
Inherited: | no
Percentages: | N/A
Media: | visual

This property determines if the character shall be treated as a word-space or as a normal letter.

This property has the following values:

auto

  The value of this property is determined by the Unicode codepoint for the character.

  As the default behavior:

  - The characters at codepoints U+0020 and U+00A0 are treated as if 'true' had been specified. All other characters are treated as if 'false' had been specified.

  - This property does not automatically apply word-spacing to the fixed spaces (U+2000 through U+200A) or the ideographic-space (u+3000).

  - This default behavior can be overridden by information in the font used for formatting the character, which can specify additional characters that may be treated as "word-spaces".

true

  This inline-progression-dimension of the character shall be adjusted as described in the "word-spacing" property.

false

  This character shall not have a word-spacing adjustment applied.

#### 7.15.8 "word-spacing"

CSS2 Definition:

Value: | normal | <length> | <space> | inherit
Initial: | normal
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-word-spacing.

This property specifies spacing behavior between words. Values have the following meanings:

normal

  The normal inter-word space, as defined by the current font and/or the UA.

<length>

  This value indicates inter-word space in addition to the default space between words. Values may be negative, but there may be implementation-specific limits.

Word spacing algorithms are user agent-dependent. Word spacing is also influenced by justification (see the 'text-align' property).

XSL modifications to the CSS definition:

The following value type has been added for XSL:

<space>

  This allows the user to specify a range of adjustments in addition to the default space between words.

  The minimum and maximum values specify the limits of the adjustment.

Default space between words is defined to be the inline-progression-dimension of the glyph-area obtained by formatting the current fo:character whose treat-as-wordspace trait has the value "true".

For fo:character whose treat-as-word-space trait has the value "true", the start-space and end-space traits are each set to a value as follows:

- For "normal": .optimum = ("the normal inter-word-space, as defined by the current font and/or the UA" - "the inline-progression-dimension of the glyph-area obtained by formatting the fo:character") / 2, .maximum = .optimum, .minimum = .optimum, .precedence = force, and .conditionality = discard.

- For a <length>: .optimum = <length> / 2, .maximum = .optimum, .minimum = .optimum, .precedence = force, and .conditionality = discard.

- For a <space>: a value that is half the value of the "word-spacing" property for the numeric components and the value for the .precedence and .conditionality components. The initial values for .precedence is "force" and for .conditionality "discard".

> NOTE:

> If it is desired that the word-space combine with other spaces that have less than forcing precedence, then the value of the word-space should be specified as a <space> with precedence less than force which implies that space combines according to the space resolution rules described in [4.3 Spaces and Conditionality].

The algorithm for resolving the adjusted values between word-spacing and letter-spacing is User Agent dependent.

> NOTE:

> The "word-spacing" property only affects the placement of glyphs and not the shape that may be associated with the characters. For example, adjusting a "_" treated as a word-space does not lengthen or shorten the "_" glyph.

### 7.16 Color-related Properties

#### 7.16.1 "color"

CSS2 Definition:

Value: | <color> | inherit
Initial: | depends on user agent
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/colors.html#propdef-color.

<color>

  Any valid color specification.

This property describes the foreground color of an element's text content.

XSL modifications to the CSS definition:

XSL adds an "icc-color" function (see [5.10.2 Color Functions]) as a valid value of this property.

#### 7.16.2 "color-profile-name"

XSL Definition:

Value: | <name> | inherit
Initial: | N/A, value is required
Applies to: | fo:color-profile
Inherited: | no
Percentages: | N/A
Media: | visual

<name>

Specifies the name of a color-profile for internal references.

#### 7.16.3 "rendering-intent"

XSL Definition:

Value: | auto | perceptual | relative-colorimetric | saturation | absolute-colorimetric | inherit
Initial: | auto
Applies to: | fo:color-profile
Inherited: | no
Percentages: | N/A
Media: | visual

"rendering-intent" permits the specification of a color-profile rendering-intent other than the default. "rendering-intent" is applicable primarily to color-profiles corresponding to CMYK color spaces. The different options cause different methods to be used for translating colors to the color gamut of the target rendering device.

Values have the following meanings:

auto

  This is the default behavior. The user-agent determines the best intent based on the content type. For image content containing an embedded profile, it shall be assumed that the intent specified within the profile is the desired intent. Otherwise, the user agent shall use the current profile and force the intent, overriding any intent that might be stored in the profile itself.

perceptual

  This method, often the preferred choice for images, preserves the relationship between colors. It attempts to maintain relative color values among the pixels as they are mapped to the target device gamut. Sometimes pixel values that were originally within the target device gamut are changed in order to avoid hue shifts and discontinuities and to preserve as much as possible the overall appearance of the scene.

relative-colorimetric

  Leaves colors that fall inside the gamut unchanged. This method usually converts out of gamut colors to colors that have the same lightness but fall just inside the gamut.

saturation

  Preserves the relative saturation (chroma) values of the original pixels. Out of gamut colors are converted to colors that have the same saturation but fall just inside the gamut.

absolute-colorimetric

  Disables white point matching when converting colors. This option is generally not recommended.

### 7.17 Float-related Properties

#### 7.17.1 "clear"

CSS2 Definition:

Value: | start | end | left | right | both | none | inherit
Initial: | none
Applies to: | block-level elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-clear.

This property indicates which sides of an element's box(es) may not be adjacent to an earlier floating box. (It may be that the element itself has floating descendants; the 'clear' property has no effect on those.)

This property may only be specified for block-level elements (including floats). For compact and run-in boxes, this property applies to the final block box to which the compact or run-in box belongs.

Values have the following meanings when applied to non-floating block boxes:

left

  The top margin of the generated box is increased enough that the top border edge is below the bottom outer edge of any left-floating boxes that resulted from elements earlier in the source document.

right

  The top margin of the generated box is increased enough that the top border edge is below the bottom outer edge of any right-floating boxes that resulted from elements earlier in the source document.

both

  The generated box is moved below all floating boxes of earlier elements in the source document.

none

  No constraint on the box's position with respect to floats.

When the property is set on floating elements, it results in a modification of the rules for positioning the float. An extra constraint (#10) is added [to those specified in the description of the 'float' property]:

10. The top outer edge of the float must be below the bottom outer edge of all earlier left-floating boxes (in the case of 'clear: left'), or all earlier right-floating boxes (in the case of 'clear: right'), or both ('clear: both').

XSL modifications to the CSS definition:

A start-float is defined to mean an area with area-class "xsl-side-float" that was generated by an fo:float with property "float" specified as "left" or "start".

An end-float is defined to mean an area with area-class "xsl-side-float" that was generated by an fo:float with property "float" specified as "right" or "end".

A side-float is defined to mean either a start-float or an end-float.

An area is defined to "clear" a side-float if the before-edge of the area's border-rectangle is positioned to be after the after-edge of the float, or if the area is not a descendant of the side-float's parent reference-area.

A block-level formatting object is defined "to clear" a side-float if the areas generated by the formatting object clear the side-float.

In XSL this property applies to block-level formatting objects and fo:float.

The clear property when applied to an fo:float that generates side-floats does not apply to the fo:float's anchor-area.

Values have the following meanings:

start

  Specifies that each area generated by the formatting object must clear every start-float whose parent reference-area is the nearest ancestor reference-area of the generated area, provided the start-float was generated by an fo:float that is before this formatting object, using pre-order traversal order of the formatting tree. Additionally specifies that each area generated by the formatting object must be placed so that the reference-area chain containing the generated area's nearest ancestor reference-area does not contain a later reference-area that is the parent of a start-float generated by an fo:float that is before this formatting object, using pre-order traversal of the formatting tree.

end

  Specifies that each area generated by the formatting object must clear every end-float whose parent reference-area is the nearest ancestor reference-area of the generated area, provided the end-float was generated by an fo:float that is before this formatting object, using pre-order traversal order of the formatting tree. Additionally specifies that each area generated by the formatting object must be placed so that the reference-area chain containing the generated area's nearest ancestor reference-area does not contain a later reference-area that is the parent of an end-float generated by an fo:float that is before this formatting object, using pre-order traversal of the formatting tree.

left

  Interpreted as "clear='start'".

right

  Interpreted as "clear='end'".

both

  Specifies that each area generated by the formatting object must clear every side-float whose parent reference-area is the nearest ancestor reference-area of the generated area, provided the side-float was generated by an fo:float that is before this formatting object, using pre-order traversal order of the formatting tree. Additionally specifies that each area generated by the formatting object must be placed so that the reference-area chain containing the generated area's nearest ancestor reference-area does not contain a later reference-area that is the parent of a side-float generated by an fo:float that is before this formatting object, using pre-order traversal of the formatting tree.

none

  This property does not impose any constraints.

When a block-level formatting object is constrained by the "clear" property, its space-before property component values may be altered as necessary for each area that it generates, in order to meet the constraint. The alterations are constrained to produce the minimum additional space required to meet the constraint of the "clear" property.

> NOTE:

> Depending on how near a side-float's after-edge is to the after-edge of its parent reference-area, a block-level formatting object may not be able to generate an area that is a descendant of the side-float's parent reference-area. In this case the first block-area generated by the formatting object must be placed in one of the following reference-areas in the reference-area chain that contains the side-float's parent reference-area.

#### 7.17.2 "float"

CSS2 Definition:

Value: | before | start | end | left | right | none | inherit
Initial: | none
Applies to: | all but positioned elements and generated content
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-float.

This property specifies whether a box should float to the left, right, or not at all. It may be set for elements that generate boxes that are not absolutely positioned. Values have the following meanings:

left

  The element generates a block box that is floated to the left. Content flows on the right side of the box, starting at the top (subject to the "clear" property). The "display" is ignored, unless it has the value "none".

right

  Same as "left", but content flows on the left side of the box, starting at the top.

none

  The box is not floated.

Here are the precise rules that govern the behavior of floats:

1. The left outer edge of a left-floating box may not be to the left of the left edge of its containing block. An analogous rule holds for right-floating elements.

2. If the current box is left-floating, and there are any left floating boxes generated by elements earlier in the source document, then for each such earlier box, either the left outer edge of the current box must be to the right of the right outer edge of the earlier box, or its top must be lower than the bottom of the earlier box. Analogous rules hold for right-floating boxes.

3. The right outer edge of a left-floating box may not be to the right of the left outer edge of any right-floating box that is to the right of it. Analogous rules hold for right-floating elements.

4. A floating box's outer top may not be higher than the top of its containing block.

5. The outer top of a floating box may not be higher than the outer top of any block or floated box generated by an element earlier in the source document.

6. The outer top of an element's floating box may not be higher than the top of any line-box containing a box generated by an element earlier in the source document.

7. A left-floating box that has another left-floating box to its left may not have its right outer edge to the right of its containing block's right edge. (Loosely: a left float may not stick out at the right edge, unless it is already as far to the left as possible.) An analogous rule holds for right-floating elements.

8. A floating box must be placed as high as possible.

9. A left-floating box must be put as far to the left as possible, a right-floating box as far to the right as possible. A higher position is preferred over one that is further to the left/right.

XSL modifications to the CSS definition:

The following values have been added for XSL: "before", "start", and "end".

In XSL this property applies only to fo:float

Values have the following meanings:

before

  Specifies that the block-areas generated by the fo:float shall be with area-class "xsl-before-float", and shall be descendants of a before-float-reference-area generated by a conditional sub-region of a region-body.

start

  Specifies that the block-areas generated by the fo:float shall be with area-class "xsl-side-float" and shall be floated toward the start-edge of the reference area.

end

  Specifies that the block-areas returned by the fo:float shall be with area-class "xsl-side-float" and shall be floated toward the end-edge of the reference area.

left

  Interpreted as "float='start'".

right

  Interpreted as "float='end'".

none

  Specifies that the block-areas generated by the fo:float shall be normal.

This property determines the area-class trait of the block-areas returned by the fo:float, which controls the placement and parent of these block-areas.

### 7.18 Keeps and Breaks Properties

Page breaks only apply to descendants of the fo:flow formatting object, and not within absolutely positioned areas, or out-of-line areas. In descendants of fo:flow formatting objects, column breaks apply, and a column break in the last (or only) column implies a page break; column breaks in static-content apply except for those in the last (or only) column which are ignored.

The semantics of keeps and breaks are further described in [4.8 Keeps and Breaks].

#### 7.18.1 "break-after"

XSL Definition:

Value: | auto | column | page | even-page | odd-page | inherit
Initial: | auto
Applies to: | block-level formatting objects, fo:list-item, and fo:table-row.
Inherited: | no
Percentages: | N/A
Media: | visual

Values for these properties have the following meanings:

auto

  No break shall be forced.

  > NOTE:

  > Page breaks may occur as determined by the formatter's processing as affected by the "widow", "orphan", "keep-with-next", "keep-with-previous", and "keep-together" properties.

column

  Imposes a break-after condition with a context consisting of column-areas.

page

  Imposes a break-after condition with a context consisting of page-areas.

even-page

  Imposes a break-after condition with a context consisting of even page-areas (a blank page may be generated if necessary).

odd-page

  Imposes a break-after condition with a context consisting of odd page-areas (a blank page may be generated if necessary).

Specifies that the last area generated by formatting this formatting object shall be the last one placed in a particular context (e.g., page-area, column-area).

This property has no effect when it appears on an fo:table-row formatting object in which there is any row spanning occurring that includes both the current fo:table-row and the subsequent one.

#### 7.18.2 "break-before"

XSL Definition:

Value: | auto | column | page | even-page | odd-page | inherit
Initial: | auto
Applies to: | block-level formatting objects, fo:list-item, and fo:table-row.
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  No break shall be forced.

  > NOTE:

  > Page breaks may occur as determined by the formatter's processing as affected by the "widow", "orphan", "keep-with-next", "keep-with-previous", and "keep-together" properties.

column

  Imposes a break-before condition with a context consisting of column-areas.

page

  Imposes a break-before condition with a context consisting of page-areas.

even-page

  Imposes a break-before condition with a context consisting of even page-areas (a blank page may be generated if necessary).

odd-page

  Imposes a break-before condition with a context consisting of odd page-areas (a blank page may be generated if necessary).

Specifies that the first area generated by formatting this formatting object shall be the first one placed in a particular context (e.g., page-area, column-area).

This property has no effect when it appears on an fo:table-row formatting object in which there is any row spanning occurring that includes both the current fo:table-row and the previous one.

#### 7.18.3 "keep-together"

XSL Definition:

Value: | <keep> | inherit
Initial: | .within-line=auto, .within-column=auto, .within-page=auto
Applies to: | block-level formatting objects, inline formatting objects, fo:title, fo:list-item, fo:list-item-label, and fo:list-item-body
Inherited: | yes
Percentages: | N/A
Media: | visual

This property imposes keep-together conditions on formatting objects.

The <keep> datatype is composed of three components: within-line, within-column, and within-page. Different components apply to different classes of formatting objects and provide keep conditions relative to different contexts. In the case of the within-line component, the keep context consists of line-areas; for the within-column component, the keep context consists of column-areas; for the within-page component, the keep context consists of page-areas. In the descriptions below, the term "appropriate context" should be interpreted in terms of the previous sentence.

Values of the components have the following meanings:

auto

  There are no keep-together conditions imposed by this property.

always

  Imposes a keep-together condition with strength "always" in the appropriate context.

<integer>

  Imposes a keep-together condition with strength of the given <integer> in the appropriate context.

The semantics of keeps and breaks are further described in [4.8 Keeps and Breaks].

#### 7.18.4 "keep-with-next"

XSL Definition:

Value: | <keep> | inherit
Initial: | .within-line=auto, .within-column=auto, .within-page=auto
Applies to: | block-level formatting objects, inline formatting objects, fo:list-item, and fo:table-row
Inherited: | no
Percentages: | N/A
Media: | visual

This property imposes keep-with-next conditions on formatting objects.

The <keep> datatype is composed of three components: within-line, within-column, and within-page. Different components apply to different classes of formatting objects and provide keep conditions relative to different contexts. In the case of the within-line component, the keep context consists of line-areas; for the within-column component, the keep context consists of column-areas; for the within-page component, the keep context consists of page-areas. In the descriptions below, the term "appropriate context" should be interpreted in terms of the previous sentence.

Values of the components have the following meanings:

auto

  There are no keep-with-next conditions imposed by this property.

always

  Imposes a keep-with-next condition with strength "always" in the appropriate context.

<integer>

  Imposes a keep-with-next condition with strength of the given <integer> in the appropriate context.

The semantics of keeps and breaks are further described in [4.8 Keeps and Breaks].

#### 7.18.5 "keep-with-previous"

XSL Definition:

Value: | <keep> | inherit
Initial: | .within-line=auto, .within-column=auto, .within-page=auto
Applies to: | block-level formatting objects, inline-level formatting objects, fo:list-item, and fo:table-row
Inherited: | no
Percentages: | N/A
Media: | visual

This property imposes keep-with-previous conditions on formatting objects.

The <keep> datatype is composed of three components: within-line, within-column, and within-page. Different components apply to different classes of formatting objects and provide keep conditions relative to different contexts. In the case of the within-line component, the keep context consists of line-areas; for the within-column component, the keep context consists of column-areas; for the within-page component, the keep context consists of page-areas. In the descriptions below, the term "appropriate context" should be interpreted in terms of the previous sentence.

Values of the components have the following meanings:

auto

  There are no keep-with-previous conditions imposed by this property.

always

  Imposes a keep-with-previous condition with strength "always" in the appropriate context.

<integer>

  Imposes a keep-with-previous condition with strength of the given <integer> in the appropriate context.

The semantics of keeps and breaks are further described in [4.8 Keeps and Breaks].

#### 7.18.6 "orphans"

CSS2 Definition:

Value: | <integer> | inherit
Initial: | 2
Applies to: | block-level elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/page.html#propdef-orphans.

See definition of property widows ([7.18.7 "widows"]).

#### 7.18.7 "widows"

CSS2 Definition:

Value: | <integer> | inherit
Initial: | 2
Applies to: | block-level elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/page.html#propdef-widows.

The "orphans" property specifies the minimum number of lines of a paragraph that must be left at the bottom of a page. The "widows" property specifies the minimum number of lines of a paragraph that must be left at the top of a page.

XSL modifications to the CSS definition:

In XSL the "orphans" property specifies the minimum number of line-areas in the first area generated by the formatting object. The "widows" property specifies the minimum number of line-areas in the last area generated by the formatting object.

### 7.19 Layout-related Properties

The following are layout-related properties that are not common to all formatting objects.

#### 7.19.1 "clip"

CSS2 Definition:

Value: | <shape> | auto | inherit
Initial: | auto
Applies to: | block-level and replaced elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visufx.html#propdef-clip.

The 'clip' property applies to elements that have a 'overflow' property with a value other than 'visible'. Values have the following meanings:

auto

  The clipping region has the same size and location as the element's box(es).

<shape>

  In CSS2, the only valid <shape> value is: rect (<top> <right> <bottom> <left>) where <top>, <bottom> <right>, and <left> specify offsets from the respective sides of the box.

  <top>, <right>, <bottom>, and <left> may either have a <length> value or "auto". Negative lengths are permitted. The value "auto" means that a given edge of the clipping region will be the same as the edge of the element's generated box (i.e., "auto" means the same as "0".)

  When coordinates are rounded to pixel coordinates, care should be taken that no pixels remain visible when <left> + <right> is equal to the element's width (or <top> + <bottom> equals the element's height), and conversely that no pixels remain hidden when these values are 0.

The element's ancestors may also have clipping regions (in case their "overflow" property is not "visible"); what is rendered is the intersection of the various clipping regions.

If the clipping region exceeds the bounds of the UA's document window, content may be clipped to that window by the native operating environment.

#### 7.19.2 "overflow"

CSS2 Definition:

Value: | visible | hidden | scroll | error-if-overflow | auto | inherit
Initial: | auto
Applies to: | block-level and replaced elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visufx.html#propdef-overflow.

This property specifies whether the content of a block-level element is clipped when it overflows the element's box (which is acting as a containing block for the content). Values have the following meanings:

visible

  This value indicates that content is not clipped, i.e., it may be rendered outside the block box.

hidden

  This value indicates that the content is clipped and that no scrolling mechanism should be provided to view the content outside the clipping region; users will not have access to clipped content. The size and shape of the clipping region is specified by the "clip" property.

scroll

  This value indicates that the content is clipped and that if the user agent uses scrolling mechanism that is visible on the screen (such as a scroll bar or a panner), that mechanism should be displayed for a box whether or not any of its content is clipped. This avoids any problem with scrollbars appearing and disappearing in a dynamic environment. When this value is specified and the target medium is "print" or 'projection', overflowing content should be printed.

auto

  The behavior of the "auto" value is user agent dependent, but should cause a scrolling mechanism to be provided for overflowing boxes.

Even if "overflow" is set to "visible", content may be clipped to a UA's document window by the native operating environment.

XSL modifications to the CSS definition:

One more value is defined as follows:

error-if-overflow

  This value implies the same semantics as the value "hidden" with the additional semantic that an error shall be indicated; implementations may recover by clipping the region.

#### 7.19.3 "reference-orientation"

XSL Definition:

Value: | 0 | 90 | 180 | 270 | -90 | -180 | -270 | inherit
Initial: | 0
Applies to: | see prose
Inherited: | yes (see prose)
Percentages: | N/A
Media: | visual

Values have the following meanings:

0

  The reference-orientation of this reference-area has the same reference-orientation as the containing reference-area.

90

  The reference-orientation of this reference-area is rotated 90 degrees counter-clockwise from the reference-orientation of the containing reference-area.

180

  The reference-orientation of this reference-area is rotated 180 degrees counter-clockwise from the reference-orientation of the containing reference-area.

270

  The reference-orientation of this reference-area is rotated 270 degrees counter-clockwise from the reference-orientation of the containing reference-area.

-90

  The reference-orientation of this reference-area is rotated 270 degrees counter-clockwise from the reference-orientation of the containing reference-area.

  > NOTE:

  > This is equivalent to specifying "270".

-180

  The reference-orientation of this reference-area is rotated 180 degrees counter-clockwise from the reference-orientation of the containing reference-area.

  > NOTE:

  > This is equivalent to specifying "180".

-270

  The reference-orientation of this reference-area is rotated 90 degrees counter-clockwise from the reference-orientation of the containing reference-area.

  > NOTE:

  > This is equivalent to specifying "90".

The reference-orientation specifies the direction for "top" for the content-rectangle of the "reference-area". This is used as the reference for deriving directions, such as the block-progression-direction, inline-progression-direction, etc. as specified by the "writing-mode" and "direction" properties, and the orientation, placement, and tiling of the background.

The "reference-orientation" property is applied only on formatting objects that establish a reference-area. Each value of "reference-orientation" sets the absolute direction for "top", "left", "bottom", and "right"; which is used by "writing-mode", "direction", and all positioning operations that are referenced to the reference-area or are nested within it.

The reference-orientation trait on an area is indirectly derived from the "reference-orientation" property on the formatting object that generates the area or the formatting object ancestors of that formatting object.

#### 7.19.4 "span"

XSL Definition:

Value: | none | all | inherit
Initial: | none
Applies to: | see prose
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

none

  This object does not span multiple columns.

all

  The areas resulting from this flow object shall span all the columns of a multi-column region.

Specifies if a block-level object should be placed in the current column or should span all columns of a multi-column region.

### 7.20 Leader and Rule Properties

#### 7.20.1 "leader-alignment"

XSL Definition:

Value: | none | reference-area | page | inherit
Initial: | none
Applies to: | fo:leader
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

none

  Leader-pattern has no special alignment.

reference-area

  Leader-pattern is aligned as if it began on the current reference-area's content-rectangle start-edge.

page

  Leader-pattern is aligned as if it began on the current page's start-edge.

Specifies whether fo:leaders having identical content and property values shall have their patterns aligned with each other, with respect to their common reference-area or page.

For fo:leaders where the "leader-pattern" property is specified as "dot" or as "use-content", this property will be honored.

If the fo:leader is aligned, the start-edge of each cycle of the repeated pattern will be placed on the start-edge of the next cycle in the appropriate pattern-alignment grid.

#### 7.20.2 "leader-pattern"

XSL Definition:

Value: | space | rule | dots | use-content | inherit
Initial: | space
Applies to: | fo:leader
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

space

  Leader is to be filled with blank space.

rule

  Leader is to be filled with a rule.

  If this choice is selected, the "rule-thickness" and "rule-style" properties are used to set the leader's style.

dots

  Leader is to be filled with a repeating sequence of dots. The choice of dot character is dependent on the user agent.

use-content

  Leader is to be filled with a repeating pattern as specified by the children of the fo:leader.

Provides the specification of how to fill in the leader.

If the leader is aligned, the start-edge of each cycle of each repeating pattern component will be placed on the start-edge of the next cycle in the pattern-alignment grid.

#### 7.20.3 "leader-pattern-width"

XSL Definition:

Value: | use-font-metrics | <length> | inherit
Initial: | use-font-metrics
Applies to: | fo:leader
Inherited: | yes
Percentages: | Refer to width of containing box
Media: | visual

Values have the following meanings:

use-font-metrics

  Use the width of the leader-pattern as determined from its font metrics.

<length>

  Sets length for leader-pattern-repeating.

  The leader will have an inline-space inserted after each pattern cycle to account for any difference between the width of the pattern as determined by the font metrics and the width specified in this property.

  If the length specified is less than the value that would be determined via the use-font-metrics choice, the value of this property is computed as if use-font-metrics choice had been specified.

Specifies the length of each repeat cycle in a repeating leader.

For leaders where the "leader-pattern" property is specified as "dot" or as "use-content", this property will be honored.

#### 7.20.4 "leader-length"

XSL Definition:

Value: | <length-range> | inherit
Initial: | leader-length.minimum=0pt, .optimum=12.0pt, .maximum=100%
Applies to: | fo:leader
Inherited: | yes
Percentages: | refer to width of content-rectangle of parent area
Media: | visual

Values have the following meanings:

<length-range>

  leader-length.minimum=sets minimum length for a leader

  leader-length.optimum=sets optimum length for a leader

  leader-length.maximum=sets maximum length for a leader

Specifies the minimum, optimum, and maximum length of an fo:leader.

This property constrains the length of the leader to be between the minimum and maximum lengths.

> NOTE:

> User agents may choose to use the value of "leader-length.optimum" to determine where to break the line, then use the minimum and maximum values during line justification."

#### 7.20.5 "rule-style"

XSL Definition:

Value: | none | dotted | dashed | solid | double | groove | ridge | inherit
Initial: | solid
Applies to: | fo:leader
Inherited: | yes
Percentages: | N/A
Media: | visual

Specifies the style (pattern) of the rule.

This property applies only if the "leader-pattern" property is specified as "rule".

Values have the following meanings:

none

  No rule, forces rule-thickness to 0.

dotted

  The rule is a series of dots.

dashed

  The rule is a series of short line segments.

solid

  The rule is a single line segment.

double

  The rule is two solid lines. The sum of the two lines and the space between them equals the value of "rule-thickness".

groove

  The rule looks as though it were carved into the canvas. (Top/left half of the rule's thickness is the color specified; the other half is white.)

ridge

  The opposite of "groove", the rule looks as though it were coming out of the canvas. (Bottom/right half of the rule's thickness is the color specified; the other half is white.)

#### 7.20.6 "rule-thickness"

XSL Definition:

Value: | <length>
Initial: | 1.0pt
Applies to: | fo:leader
Inherited: | yes
Percentages: | N/A
Media: | visual

Specifies the overall thickness of the rule.

This property applies only if the "leader-pattern" property is specified as "rule".

Values have the following meanings:

<length>

  The "rule-thickness" is always perpendicular to its length-axis.

  The rule is thickened equally above and below the line's alignment position. This can be adjusted through the "baseline-shift" property.

### 7.21 Properties for Dynamic Effects Formatting Objects

#### 7.21.1 "active-state"

XSL Definition:

Value: | link | visited | active | hover | focus
Initial: | no, a value is required
Applies to: | fo:multi-property-set
Inherited: | no
Percentages: | N/A
Media: | interactive

link

  This fo:multi-property-set applies if there is a fo:basic-link descendant of the parent fo:multi-properties and that link has not yet been visited.

visited

  This fo:multi-property-set applies if there is a fo:basic-link descendant of the parent fo:multi-properties and that link has been visited.

active

  This fo:multi-property-set applies while a normal area returned by the parent fo:multi-properties is being activated by the user. For example, between the times the user presses the mouse button and releases it.

hover

  This fo:multi-property-set applies while the user designates a normal area returned by the parent fo:multi-properties (with some pointing device), but does not activate it. For example the cursor (mouse pointer) hovers over such an area.

focus

  This fo:multi-property-set applies while a normal area returned by the parent fo:multi-properties has the focus (accepts keyboard events or other forms of text input).

The "active-state" property is used to control which of the fo:multi-property-sets are used to format the child flow objects within an fo:multi-properties formatting object. The states (or at least the events that cause the state to be entered) are defined by the DOM.

#### 7.21.2 "auto-restore"

XSL Definition:

Value: | true | false
Initial: | false
Applies to: | fo:multi-switch
Inherited: | yes
Percentages: | N/A
Media: | interactive

true

  If this fo:multi-switch is contained in another fo:multi-switch, and that fo:multi-switch changes the active fo:multi-case (hiding this fo:multi-switch), then this fo:multi-switch should restore its initial fo:multi-case.

false

  This fo:multi-switch should retain its current fo:multi-case.

Specifies if the initial fo:multi-case should be restored when the fo:multi-switch gets hidden by an ancestor fo:multi-switch.

> NOTE:

> A common case of using this property with a "true" value is when several nested fo:multi-switch objects build an expandable/collapsible table-of-contents view. If the table-of-contents is expanded far down the hierarchy, and an (far above) ancestor is closed, one would want all sub-titles to have restored to their original state when that ancestor is opened again.

#### 7.21.3 "case-name"

XSL Definition:

Value: | <name>
Initial: | none, a value is required
Applies to: | fo:multi-case
Inherited: | no, a value is required
Percentages: | N/A
Media: | interactive

<name>

  Specifies a name for an fo:multi-case. The name must be unique among the current fo:multi-case siblings, i.e., in the scope of the fo:multi-switch object that (directly) contains them. Other instances of fo:multi-switch objects may use the same names for its fo:multi-case objects.

The purpose of this property is to allow fo:multi-toggle objects to select fo:multi-case objects to switch to.

#### 7.21.4 "case-title"

XSL Definition:

Value: | <string>
Initial: | none, a value is required
Applies to: | fo:multi-case
Inherited: | no, a value is required
Percentages: | N/A
Media: | interactive

<string>

  Specifies a descriptive title for the fo:multi-case. The title can be displayed in a menu to represent this fo:multi-case when an fo:multi-toggle object names several fo:multi-case objects as allowed destinations.

#### 7.21.5 "destination-placement-offset"

XSL Definition:

Value: | <length>
Initial: | 0pt
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

<length>

The "destination-placement-offset" property specifies the distance from the beginning (top) of the page to the innermost line-area that contains the first destination area. If the first destination area is not contained in a line-area, the "destination-placement-offset" property instead directly specifies the distance to the top of the destination area.

If the specification of destination-placement-offset would result in a distance longer than the distance from the start of the document, the distance from the start of the document should be used.

If the specified distance would push the first destination area below the page-area, the distance should be decreased so the whole first destination area becomes visible, if possible. If the first destination area is higher than the page, the top of the area should be aligned with the top of the page.

#### 7.21.6 "external-destination"

XSL Definition:

Value: | <uri-specification>
Initial: | empty string
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

<uri-specification>

Specifies the destination resource (or, when a fragment identifier is given, sub-resource) for an fo:basic-link.

How the destination (sub-)resource is used and/or displayed is application and implementation-dependent. In typical browsing applications, the destination resource is displayed in the browser positioned so that some rendered portion resulting from the processing of some part of the specific destination sub-resource indicated by the fragment identifier is in view.

At least one of the external-destination and internal-destination properties should be assigned. If both are assigned, the system may either report the error, or use the internal-destination property.

#### 7.21.7 "indicate-destination"

XSL Definition:

Value: | true | false
Initial: | false
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

true

  The areas that belong to the link target when traversed should, in a system-dependent manner, be indicated.

false

  No special indication should be made.

> NOTE:

> This could be indicated in any feasible way, e.g., by reversed video, etc.

#### 7.21.8 "internal-destination"

XSL Definition:

Value: | empty string | <idref>
Initial: | empty string
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

<idref>

Specifies the destination flow object of an fo:basic-link. This property allows the destination flow object node to be explicitly specified.

At least one of the external-destination and internal-destination properties should be assigned. If both are assigned, the system may either report the error, or use the internal-destination property.

#### 7.21.9 "show-destination"

XSL Definition:

Value: | replace | new
Initial: | replace
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

replace

  The current document view should be replaced. However, if the destination area(s) are already available in a page/region, those areas should simply be moved/scrolled "into sight".

new

  A new (additional) document view should always be opened.

Specifies where the destination resource should be displayed.

#### 7.21.10 "starting-state"

XSL Definition:

Value: | show | hide
Initial: | show
Applies to: | fo:multi-case
Inherited: | no
Percentages: | N/A
Media: | interactive

show

  The content of the fo:multi-case is a candidate for being displayed initially.

hide

  The content of the fo:multi-case is not a candidate for being displayed initially.

Specifies if the fo:multi-case can be initially displayed.

The parent fo:multi-switch shall choose the first fo:multi-case child where the property "starting-state" has the value equal to "show".

> NOTE:

> Any number of the fo:multi-case objects may assign "starting-state" to "show".

If no fo:multi-case has "starting-state" property value of "show", the contents of no fo:multi-case should be displayed.

> NOTE:

> If no multi-case is displayed, the entire fo:multi-switch will effectively be hidden.

#### 7.21.11 "switch-to"

XSL Definition:

Value: | xsl-preceding | xsl-following | xsl-any | <name>[ <name>]*
Initial: | xsl-any
Applies to: | fo:multi-toggle
Inherited: | no
Percentages: | N/A
Media: | interactive

xsl-preceding

  Activating the switch should result in the current fo:multi-case being replaced by its preceding sibling.

  > NOTE:

  > The current fo:multi-case is the closest ancestor fo:multi-case.

  In other words, the current fo:multi-switch should switch to the previous sibling of the fo:multi-case that is currently selected.

  > NOTE:

  > The current fo:multi-switch is the closest ancestor fo:multi-switch.

  If the current fo:multi-case is the first sibling, xsl-preceding should switch to the last fo:multi-case sibling.

xsl-following

  Activating the switch should result in that the current fo:multi-case is replaced by its next sibling.

  If the current fo:multi-case is the last sibling, xsl-following should switch to the first fo:multi-case sibling.

xsl-any

  Activating the switch should allow the user to select any other fo:multi-case sibling.

  If there is only a single other fo:multi-case, the toggle should immediately switch to it (and not show that single choice to the user).

<name>

  A name matching a case-name of an fo:multi-case.

Specifies what fo:multi-case object(s) this fo:multi-toggle shall switch to.

If switch-to is a name list, the user can switch to any of the named multi-case objects. If a multi-toggle with a single name is activated, it should immediately switch to the named multi-case.

> NOTE:

> How to actually select the multi-case from a list is system dependent.

#### 7.21.12 "target-presentation-context"

XSL Definition:

Value: | use-target-processing-context | <uri-specification>
Initial: | use-target-processing-context
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

use-target-processing-context

  The context specified by the "target-processing-context" property shall be used.

<uri-specification>

Specifies the limited context in which the resource should be presented if the external destination is a resource of a processed structured media type for which a limited presentational context makes sense (e.g., XML, XHTML, SVG).

This property is ignored if the "external-destination" property has an empty string value or if the external destination is not of a processed structured media type for which a limited presentational context makes sense.

> NOTE:

> For example, an XML and XSL implementation may parse the XML document, but begin XSLT processing by applying templates to the node set indicated by the "target-presentation-context" property.

> NOTE:

> If this is a node other than the document root, numbering and other contextually-dependent presentation may differ between implementations. Some implementations may want to make this tradeoff for memory or performance reasons.

#### 7.21.13 "target-processing-context"

XSL Definition:

Value: | document-root | <uri-specification>
Initial: | document-root
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

document-root

  The root of the document of the external-destination is used.

<uri-specification>

Specifies the root of a virtual document that the processor preparing the new presentation should process if the external destination is a resource of a processed structured media type (e.g., XML, SVG).

This property is ignored if the "external-destination" property has an empty string value or if the external destination is not of a processed structured media type.

> NOTE:

> Not all URI references will be sensible roots, e.g., an XPointer that gives a string range into an XML document.

If the root is not valid for the media type the processor may ignore this property.

#### 7.21.14 "target-stylesheet"

XSL Definition:

Value: | use-normal-stylesheet | <uri-specification>
Initial: | use-normal-stylesheet
Applies to: | fo:basic-link
Inherited: | no
Percentages: | N/A
Media: | interactive

use-normal-stylesheet

  The implementation will discover stylesheets using its usual methods.

<uri-specification>

Specifies the stylesheet that shall be used for processing the resource. This stylesheet shall be used instead of any other stylesheet that otherwise would be used.

> NOTE:

> For example from HTTP header information, XML stylesheet processing instructions, or XHTML style and link elements.

This property is ignored if the "external-destination" property has an empty string value or if the external destination is not of a media type that uses stylesheets.

> NOTE:

> In this version of XSL, only a single stylesheet URI reference is permitted. A future version of XSL may extend the stylesheet specification.

### 7.22 Properties for Markers

#### 7.22.1 "marker-class-name"

XSL Definition:

Value: | <name>
Initial: | an empty name
Applies to: | fo:marker
Inherited: | no, a value is required
Percentages: | N/A
Media: | paged

Values have the following meanings:

<name>

  Names used as identifiers must be unique among fo:markers that are (conceptually) attached to the same area.

  If the name is empty or if a name-conflict is encountered, an error shall be reported. A processor may then continue processing.

This property identifies the fo:marker as being in a group with others that have the same name, each of which becomes a candidate to be retrieved by an fo:retrieve-marker that has a "retrieve-class-name" property of the same value.

#### 7.22.2 "retrieve-class-name"

XSL Definition:

Value: | <name>
Initial: | an empty name
Applies to: | fo:retrieve-marker
Inherited: | no, a value is required
Percentages: | N/A
Media: | paged

Values have the following meanings:

<name>

  A name that matches the "marker-class-name" property value of an fo:marker.

This property constrains that the fo:marker whose children are retrieved by the fo:retrieve-marker must have a "marker-class-name" property value that is the same as the value of this property.

#### 7.22.3 "retrieve-position"

XSL Definition:

Value: | first-starting-within-page | first-including-carryover | last-starting-within-page | last-ending-within-page
Initial: | first-starting-within-page
Applies to: | fo:retrieve-marker
Inherited: | no
Percentages: | N/A
Media: | paged

The term "containing page" is used here to mean the page that contains the first area generated or returned by the children of the retrieved fo:marker.

Values have the following meanings:

first-starting-within-page

  Specifies a preference for retrieving the children of an fo:marker attached to an area that is

  - within the containing page

  - whose "is-first" trait is set to "true"

  and that precedes in the area tree any other similarly constrained area that is attached to an identically named fo:marker, using pre-order traversal order.

first-including-carryover

  Specifies a preference for retrieving the children of an fo:marker attached to an area that is within the containing page and that precedes in the area tree any other similarly constrained area that is attached to an identically named fo:marker, using pre-order traversal order.

last-starting-within-page

  Specifies a preference for retrieving the children of an fo:marker attached to an area that is

  - within the containing page

  - whose "is-first" trait is set to "true"

  and that follows in the area tree any other similarly constrained area that is attached to an identically named fo:marker, using pre-order traversal order.

last-ending-within-page

  Specifies a preference for retrieving the children of an fo:marker attached to an area that is within the containing page whose "is-last" trait is set to "true" and that follows in the area tree any other similarly constrained area that is attached to an identically named fo:marker, using pre-order traversal order.

This property specifies the preference for which fo:marker's children shall be retrieved by an fo:retrieve-marker, based on the areas returned by the parent of the fo:marker relative to the areas returned by the parents of other identically named fo:marker's.

#### 7.22.4 "retrieve-boundary"

XSL Definition:

Value: | page | page-sequence | document
Initial: | page-sequence
Applies to: | fo:retrieve-marker
Inherited: | no
Percentages: | N/A
Media: | paged

The term "containing page" is used here to mean the page that contains the first area generated or returned by the children of the retrieved fo:marker.

Values have the following meanings:

page

  Specifies that the children of any fo:markers whose parent generated or returned a normal area within the containing page or generated non-normal area within the containing page may be retrieved by this fo:retrieve-marker.

page-sequence

  Specifies that only the children of fo:markers that are descendants of the fo:flow within the containing fo:page-sequence may be retrieved by this fo:retrieve-marker.

document

  Specifies that the children of any fo:marker that is a descendant of any fo:flow within the document may be retrieved by this fo:retrieve-marker.

### 7.23 Properties for Number to String Conversion

#### 7.23.1 "format"

XSL Definition:

Value: | <string>
Initial: | 1
Applies to: | fo:page-sequence
Inherited: | no
Percentages: | N/A
Media: | all

This property is defined in [XSLT]: Number to String Conversion Attributes.

#### 7.23.2 "grouping-separator"

XSL Definition:

Value: | <character>
Initial: | no separator
Applies to: | fo:page-sequence
Inherited: | no
Percentages: | N/A
Media: | all

This property is defined in [XSLT]: Number to String Conversion Attributes.

#### 7.23.3 "grouping-size"

XSL Definition:

Value: | <number>
Initial: | no grouping
Applies to: | fo:page-sequence
Inherited: | no
Percentages: | N/A
Media: | all

This property is defined in [XSLT]: Number to String Conversion Attributes.

#### 7.23.4 "letter-value"

XSL Definition:

Value: | auto | alphabetic | traditional
Initial: | auto
Applies to: | fo:page-sequence
Inherited: | no
Percentages: | N/A
Media: | all

This property is defined in [XSLT]: Number to String Conversion Attributes. A value of "auto" corresponds to the XSLT definition for when the attribute is not specified.

### 7.24 Pagination and Layout Properties

The following pagination and layout properties are all XSL only.

#### 7.24.1 "blank-or-not-blank"

XSL Definition:

Value: | blank | not-blank | any | inherit
Initial: | any
Applies to: | fo:conditional-page-master-reference
Inherited: | no
Percentages: | N/A
Media: | visual

This property forms part of a selection rule to determine if the referenced page-master is eligible for selection at this point in the page-sequence.

The values have the following meanings:

blank

  This master is eligible for selection if a page must be generated (e.g., to maintain proper page parity at the start or end of the page-sequence) and there are no areas from the fo:flow to be put on that page.

not-blank

  This master is eligible for selection if this page contains areas from the fo:flow.

any

  This master is always eligible for selection.

#### 7.24.2 "column-count"

XSL Definition:

Value: | <number> | inherit
Initial: | 1
Applies to: | fo:region-body
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

<integer>

  A positive integer. If a negative or non-integer value is provided, the value will be rounded to the nearest integer value greater than or equal to 1.

Specifies the number of columns in the region.

A value of 1 indicates that this is not a multi-column region.

#### 7.24.3 "column-gap"

XSL Definition:

Value: | <length> | <percentage> | inherit
Initial: | 12.0pt
Applies to: | fo:region-body
Inherited: | no
Percentages: | refer to width of the region being divided into columns.
Media: | visual

Values have the following meanings:

<length>

  This is an unsigned length. If a negative value has been specified a value of 0pt will be used.

<percentage>

  The value is a percentage of the inline-progression-dimension of the content-rectangle of the region.

Specifies the width of the separation between adjacent columns in a multi-column region. See the description in [6.4.13 fo:region-body] for further details.

#### 7.24.4 "extent"

XSL Definition:

Value: | <length> | <percentage> | inherit
Initial: | 0.0pt
Applies to: | fo:region-before, fo:region-after, fo:region-start, fo:region-end
Inherited: | no
Percentages: | refer to the corresponding height or width of the region reference-area.
Media: | visual

Values have the following meanings:

<length>

  This is an unsigned length. If a negative value has been specified a value of 0pt will be used.

<percentage>

  The value is a percentage of corresponding height or width of the page.

Specifies the width of the region-start or region-end or the height of the region-before or region-after.

#### 7.24.5 "flow-name"

XSL Definition:

Value: | <name>
Initial: | an empty name
Applies to: | fo:flow, fo:static-content
Inherited: | no, a value is required
Percentages: | N/A
Media: | visual

Values have the following meanings:

<name>

  Names used as identifiers must be unique within an fo:page-sequence.

  If the name is empty or if a name-conflict is encountered, an error shall be reported. A processor may then continue processing.

Defines the name of the flow.

The flow-name and region-name are used to assign the flow's content (or static-content's content) to a specific region or series of regions in the layout. In XSL this is done by specifying the name of the target region as the flow-name. (For example, text placed in the region-body would specify flow-name="xsl-region-body".)

#### 7.24.6 "force-page-count"

XSL Definition:

Value: | auto | even | odd | end-on-even | end-on-odd | no-force | inherit
Initial: | auto
Applies to: | fo:page-sequence
Inherited: | no
Percentages: | N/A
Media: | visual

Force-page-count is used to impose a constraint on the number of pages in a page-sequence. In the event that this constraint is not satisfied, an additional page will be added to the end of the sequence. This page becomes the "last" page of that sequence.

The values have the following meanings:

auto

  Force the last page in this page-sequence to be an odd-page if the initial-page-number of the next page-sequence is even. Force it to be an even-page if the initial-page-number of the next page-sequence is odd. If there is no next page-sequence or if the value of its initial-page-number is "auto" do not force any page.

even

  Force an even number of pages in this page-sequence.

odd

  Force an odd number of pages in this page-sequence.

end-on-even

  Force the last page in this page-sequence to be an even-page.

end-on-odd

  Force the last page in this page-sequence to be an odd-page.

no-force

  Do not force either an even or an odd number of pages in this page-sequence

> NOTE:

> Whether a page is an odd-page or even-page is determined from the page-number trait.

#### 7.24.7 "initial-page-number"

XSL Definition:

Value: | auto | auto-odd | auto-even | <number> | inherit
Initial: | auto
Applies to: | fo:page-sequence
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  The initial number shall be set to 1 if no previous fo:page-sequence exists in the document.

  If a preceding page-sequence exists, the initial number will be one greater than the last number for that sequence.

auto-odd

  A value is determined in the same manner as for "auto". If that value is an even number 1 is added.

auto-even

  A value is determined in the same manner as for "auto". If that value is an odd number 1 is added.

<integer>

  A positive integer. If a negative or non-integer value is provided, the value will be rounded to the nearest integer value greater than or equal to 1.

Sets the initial-page-number to be used on this page-sequence.

#### 7.24.8 "master-name"

XSL Definition:

Value: | <name>
Initial: | an empty name
Applies to: | fo:page-sequence, fo:simple-page-master, fo:page-sequence-master, fo:single-page-master-reference, fo:repeatable-page-master-reference, fo:conditional-page-master-reference
Inherited: | no, a value is required
Percentages: | N/A
Media: | viaual

Values have the following meanings:

<name>

  Names used as master identifiers may not be empty and must be unique.

  Uses of the name to reference a given named object need not be unique, but may not be empty and must refer to a master-name that exists within the document.

This property is used for two purposes:

- Identifying a master:

  If this property is specified on an fo:simple-page-master, it provides an identifying name of the master. This name is subsequently referenced as the value of properties on the following formatting objects: fo:single-page-master-reference, fo:repeatable-page-master-reference, and fo:conditional-page-master-reference to request the use of this master when creating a page instance. It may also be used on an fo:page-sequence to specify the use of this master when creating page instances.

  If this property is specified on an fo:page-sequence-master, it provides an identifying name of the master. This name is subsequently referenced as the value of properties on the fo:page-sequence to request the use of this page-sequence-master when creating page instances.

  A master-name must be unique across all page-masters and page-sequence-masters.

  If the name is empty or if a name-conflict is encountered, an error shall be reported. A processor may then continue processing.

- Selecting a master:

  - If this property is specified on the fo:page-sequence it specifies the name of the page-sequence-master or page-master to be used to create pages in the sequence.

  - If this property is specified on the fo:single-page-master-reference, it specifies the name of the page-master to be used to create a single page instance.

  - If this property is specified on the fo:repeatable-page-master-reference, it specifies the name of the page-master to be used in repetition until the content is exhausted or the maximum-repeats limit is reached, whichever occurs first.

  - If this property is specified on the fo:conditional-page-master-reference, it specifies the name of the page-master to be used whenever this alternative is chosen.

  If the name is empty or if a name-conflict is encountered, an error shall be reported. A processor may then continue processing.

#### 7.24.9 "maximum-repeats"

XSL Definition:

Value: | <number> | no-limit | inherit
Initial: | no-limit
Applies to: | fo:repeatable-page-master-reference, fo:repeatable-page-master-alternatives
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the constraint on the maximum number of pages in the sub-sequence of pages that may be generated by an fo:page-sequence that uses the fo:repeatable-page-master-reference or fo:repeatable-page-master-alternatives on which this property is specified.

The values have the following meanings:

no-limit

  No constraint is specified.

<integer>

  The maximum number of pages in the sub-sequence.

  The value is an integer greater than or equal to 0.

  If a fractional value or a value less than 0 is specified, it will be rounded to the nearest integer greater than or equal to 0.

  A value of 0 indicates this master-reference will not be used.

#### 7.24.10 "media-usage"

XSL Definition:

Value: | auto | paginate | bounded-in-one-dimension | unbounded
Initial: | auto
Applies to: | fo:root
Inherited: | no
Percentages: | NA
Media: | visual

The "media-usage" property is used to control how the selected display medium is used to present the page(s) specified by the stylesheet.

Values for the property have the following meaning:

auto

  The User Agent determines which value of "media-usage" (other than the "auto" value) is used. The User Agent may consider the type of media on which the presentation is to be placed in making this determination.

  > NOTE:

  > For example, the User Agent could use the following decision process. If the media is not continuous and is of fixed bounded size, then the "paginate" (described below) is used. Otherwise, the "bounded-in-one-dimension" is used.

paginate

  A sequence of pages is generated from the fo:page-sequences that are children of the fo:root as described in [6.4.5 fo:page-sequence].

bounded-in-one-dimension

  Only one page is generated per fo:page-sequence descendant from the fo:root. Exactly one of "page-height" or "page-width" must be specified on the first page master that is used. The size of the page in the other dimension is determined by the content flowed into the page.

  It is an error if more or less than one of "page-height" or "page-width" is specified on the first page master that is used. The User Agent may recover as follows: The recovery depends on the "reference-orientation" of the page master and "writing-mode" of the region of that page master to which the fo:flow is assigned. There are four cases: (1) the "reference-orientation" is "0" or "180" and the "writing-mode" is horizontal; (2) the "reference-orientation" is "0" or "180" and the "writing-mode" is vertical; (3) the "reference-orientation" is "90" or "270" and the "writing-mode" is horizontal; (4) the "reference-orientation" is "90" or "270" and the "writing-mode" is vertical. For cases (1) and (3), the "page-width" is bounded and the "page-height" is not bounded. For case (2) and (4), the "page-height" is bounded and the "page-width" is not bounded.

unbounded

  Only one page is generated per fo:page-sequence descendant from the fo:root. Neither "page-height" nor "page-width" may be specified on any page master that is used. If a value is specified for either property, it is an error and a User Agent may recover by ignoring the specified value. Each page begins at the before-edge and start-edge of the page and the page extends as far as necessary toward the after-edge and end-edge to contain all the content of the page-sequence which generates the page.

  > NOTE:

  > This implies that no text content is automatically wrapped; that is, each block will have a single line for each text node that does not contain a U+000A character. If more than once line is generated, then the sequence of characters that generated the glyphs in each such line must have been bounded in the original text node, either by the beginning or end of that text node or by an U+000A character within that text node. Control over the treatment of the U+000A character is described in [7.14.7 "linefeed-treatment"].

#### 7.24.11 "odd-or-even"

XSL Definition:

Value: | odd | even | any | inherit
Initial: | any
Applies to: | fo:conditional-page-master-reference
Inherited: | no
Percentages: | N/A
Media: | visual

This property forms part of a selection rule to determine if the referenced page-master is eligible for selection at this point in the page-sequence.

The values have the following meanings:

odd

  This master is eligible for selection if the page number is odd.

even

  This master is eligible for selection if the page number is even.

any

  This master is eligible for selection regardless of whether the page number is odd or even.

> NOTE:

> "Page number" refers to the page-number trait for the page to be generated.

#### 7.24.12 "page-height"

XSL Definition:

Value: | auto | indefinite | <length> | inherit
Initial: | auto
Applies to: | fo:simple-page-master
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  The "page-height" shall be determined, in the case of continous media, from the size of the User Agent window, otherwise from the size of the media. If media information is not available this dimension shall be implementation-defined.

  > NOTE:

  > A fallback to 11.0in would fit on both 8+1/2x11 and A4 pages).

indefinite

  The height of the page is determined from the size of the laid-out content.

  "Page-width" and "page-height" may not both be set to "indefinite". Should that occur, the dimension that is parallel to the block-progression-direction, as determined by the "reference-orientation" and "writing-mode" on the fo:simple-page-master, of the page-reference-area will remain "indefinite" and the other will revert to "auto".

<length>

  Specifies a fixed height for the page.

Specifies the height of a page.

> NOTE:

> The values for the "page-width" and "page-height" properties are intended to permit the size specification to match the handling of a frameset in a browser window when the media is continuous and to match pages when the media is paged.

> A User Agent may provide a way to declare the media for which formatting is to be done. This may be different from the media on which the formatted result is viewed. For example, a browser User Agent may be used to preview pages that are formatted for sheet media. In that case, the size calculation is based on the media for which formatting is done rather than the media being currently used.

#### 7.24.13 "page-position"

XSL Definition:

Value: | first | last | rest | any | inherit
Initial: | any
Applies to: | fo:conditional-page-master-reference
Inherited: | no
Percentages: | N/A
Media: | visual

This property forms part of a selection rule to determine if the referenced page-master is eligible for selection at this point in the page-sequence.

The values have the following meanings:

first

  This master is eligible for selection if this is the first page in the page-sequence.

last

  This master is eligible for selection if this is the last page in the page-sequence.

rest

  This master is eligible for selection if this is not the first page nor the last page in the page-sequence.

any

  This master is eligible for selection regardless of page positioning within the page-sequence.

#### 7.24.14 "page-width"

XSL Definition:

Value: | auto | indefinite | <length> | inherit
Initial: | auto
Applies to: | fo:simple-page-master
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  The "page-width" shall be determined, in the case of continous media, from the size of the User Agent window, otherwise from the size of the media. If media information is not available this dimension shall be implementation-defined.

  > NOTE:

  > A fallback to 8.26in would fit on both 8+1/2x11 and A4 pages).

indefinite

  The width of the page is determined from the size of the laid-out content.

  "Page-width" and "page-height" properties may not both be set to "indefinite". Should that occur, the dimension that is parallel to the block-progression-direction, as determined by the "reference-orientation" and "writing-mode" on the fo:simple-page-master, of the page-reference-area will remain "indefinite" and the other will revert to "auto".

<length>

  Specifies a fixed width for the page.

Specifies the width of a page.

#### 7.24.15 "precedence"

XSL Definition:

Value: | true | false | inherit
Initial: | false
Applies to: | fo:before-region, fo:after-region, fo:start-region, fo:end-region
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

false

  A value of false specifies that this region does not extend to the page margins. This region has the same width or height as the body.

true

  A value of true specifies that this region takes precedence and extends across the full size of the page or view.

Specifies which region (i.e., region-before, region-after, region-start, or region-end) takes precedence in terms of which may extend into the corners of the simple-page-master.

If both adjacent regions have equal precedence, the before-region or after-region is treated as if 'true' had been specified and the start-region or end-region will be treated as if 'false' had been specified.

#### 7.24.16 "region-name"

XSL Definition:

Value: | xsl-region-body | xsl-region-start | xsl-region-end | xsl-region-before | xsl-region-after | xsl-before-float-separator | xsl-footnote-separator | <name>
Initial: | see prose
Applies to: | fo:region-body, fo:region-start, fo:region-end, fo:region-before, and fo:region-after
Inherited: | no, a value is required
Percentages: | N/A
Media: | visual

Values have the following meanings:

xsl-region-body

  Reserved region-name for use as default name of fo:region-body. This name may not be used on any other class of region.

xsl-region-start

  Reserved region-name for use as default name of fo:region-start. This name may not be used on any other class of region.

xsl-region-end

  Reserved region-name for use as default name of fo:region-end. This name may not be used on any other class of region.

xsl-region-before

  Reserved region-name for use as default name of fo:region-before. This name may not be used on any other class of region.

xsl-region-after

  Reserved region-name for use as default name of fo:region-after. This name may not be used on any other class of region.

xsl-before-float-separator

  Reserved name for content to be used as a separator at the end-edge of a before-float-reference-area. This name may not be used on any other class of region.

xsl-footnote-separator

  Reserved name for content to be used as a separator at the start-edge of a footnote-reference-area. This name may not be used on any other class of region.

<name>

  Names used as identifiers must be unique within a page-master.

This property is used to identify a region within a simple-page-master.

The "region-name" may be used to differentiate a region that lies on a page-master for an odd page from a region that lies on a page-master for an even page. In this usage, once a name is used for a specific class of region (start, end, before, after, or body), that name may only be used for regions of the same class in any other page-master. The reserved names may only be used in the manner described above.

### 7.25 Table Properties

#### 7.25.1 "border-after-precedence"

XSL Definition:

Value: | force | <integer> | inherit
Initial: | fo:table: 1, fo:table-cell: 0
Applies to: | fo:table, fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

force

  The precedence is higher than any <integer>.

<integer>

  A numeric precedence specification. A higher value has a higher precedence than a lower one.

Specifies the precedence of the border specification on this formatting object for the border-after.

#### 7.25.2 "border-before-precedence"

XSL Definition:

Value: | force | <integer> | inherit
Initial: | fo:table: 1, fo:table-cell: 0
Applies to: | fo:table, fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the precedence of the border specification on this formatting object for the border-before.

See definition of property border-after-precedence ([7.25.1 "border-after-precedence"]).

#### 7.25.3 "border-collapse"

CSS2 Definition:

Value: | collapse | separate | inherit
Initial: | collapse
Applies to: | table
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/tables.html#propdef-border-collapse.

collapse

  The value "collapse" selects the collapsing borders model.

separate

  The value "separate" selects the separated borders border model.

This property selects a table's border model. The value "separate" selects the separated borders border model. The value "collapse" selects the collapsing borders model.

#### 7.25.4 "border-end-precedence"

XSL Definition:

Value: | force | <integer> | inherit
Initial: | fo:table: 1, fo:table-cell: 0
Applies to: | fo:table, fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the precedence of the border specification on this formatting object for the border-end.

See definition of property border-after-precedence ([7.25.1 "border-after-precedence"]).

#### 7.25.5 "border-separation"

XSL Definition:

Value: | <length-bp-ip-direction> | inherit
Initial: | .block-progression-direction="0pt" .inline-progression-direction="0pt"
Applies to: | table
Inherited: | yes
Percentages: | N/A
Media: | visual

<length-bp-ip-direction>

The lengths specify the distance that separates adjacent cell borders in the row-stacking-direction (given by the block-progression-direction of the table), and in the column-stacking-direction (given by the inline-progression-direction of the table).

In the separate borders model, each cell has an individual border. The "border-separation" property specifies the distance between the borders of adjacent cells. This space is filled with the background of the table element. Rows, columns, row groups, and column groups cannot have borders (i.e., user agents must ignore the border properties for those elements).

#### 7.25.6 "border-start-precedence"

XSL Definition:

Value: | force | <integer> | inherit
Initial: | fo:table: 1, fo:table-cell: 0
Applies to: | fo:table, fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

Specifies the precedence of the border specification on this formatting object for the border-start.

See definition of property border-after-precedence ([7.25.1 "border-after-precedence"]).

#### 7.25.7 "caption-side"

CSS2 Definition:

Value: | before | after | start | end | top | bottom | left | right | inherit
Initial: | before
Applies to: | fo:table-caption
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/tables.html#q6.

top

  Positions the caption box above the table box.

bottom

  Positions the caption box below the table box.

left

  Positions the caption box to the left of the table box.

right

  Positions the caption box to the right of the table box.

This property specifies the position of the caption box with respect to the table box.

Captions above or below a "table" element are formatted very much as if they were a block element before or after the table, except that (1) they inherit inheritable properties from the table, and (2) they are not considered to be a block box for the purposes of any "compact" or "run-in" element that may precede the table.

A caption that is above or below a table box also behaves like a block box for width calculations; the width is computed with respect to the width of the table box's containing block.

For a caption that is on the left or right side of a table box, on the other hand, a value other than "auto" for "width" sets the width explicitly, but "auto" tells the user agent to chose a "reasonable width". This may vary between "the narrowest possible box" to "a single line", so we recommend that users do not specify "auto" for left and right caption widths.

To align caption content horizontally within the caption box, use the "text-align" property. For vertical alignment of a left or right caption box with respect to the table box, use the "vertical-align" property. The only meaningful values in this case are "top", "middle", and "bottom". All other values are treated the same as "top".

XSL modifications to the CSS definition:

Insert the following writing-mode relative values:

before

  Positions the caption before the table in the block-progression-direction.

after

  Positions the caption after the table in the block-progression-direction.

start

  Positions the caption before the table in the inline-progression-direction.

end

  Positions the caption after the table in the inline-progression-direction.

The CSS qualifications (1) and (2) do not apply. The last three sentences in the last paragraph (referencing "vertical-align") do not apply.

#### 7.25.8 "column-number"

XSL Definition:

Value: | <number>
Initial: | see prose
Applies to: | fo:table-column, fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

<integer>

  A positive integer. If a negative or non-integer value is provided, the value will be rounded to the nearest integer value greater than or equal to 1.

For an fo:table-column formatting object, it specifies the column-number of the table cells that may use properties from this fo:table-column formatting object by using the from-table-column() function. The initial value is 1 plus the column-number of the previous table-column, if there is a previous table-column, and otherwise 1.

For an fo:table-cell it specifies the number of the first column to be spanned by the table-cell. The initial value is the current column-number. For the first table-cell in a table-row, the current column number is 1. For other table-cells, the current column-number is the column-number of the previous table-cell in the row plus the number of columns spanned by that previous cell.

#### 7.25.9 "column-width"

XSL Definition:

Value: | <length> | <percentage>
Initial: | see prose
Applies to: | fo:table-column
Inherited: | no
Percentages: | refer to width of table
Media: | visual

<length>

The "column-width" property specifies the width of the column whose value is given by the "column-number" property. This property, if present, is ignored if the "number-columns-spanned" property is greater than 1. The "column-width" property must be specified for every column, unless the automatic table layout is used.

> NOTE:

> The result of using a percentage for the width may be unpredictable, especially when using the automatic table layout.

#### 7.25.10 "empty-cells"

CSS2 Definition:

Value: | show | hide | inherit
Initial: | show
Applies to: | table-cell
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/tables.html#propdef-empty-cells.

show

  When this property has the value "show", borders are drawn around empty cells (like normal cells).

hide

  A value of "hide" means that no borders are drawn around empty cells. Furthermore, if all the cells in a row have a value of "hide" and have no visible content, the entire row behaves as if it had "display: none".

In the separated borders model, this property controls the rendering of borders around cells that have no visible content. Empty cells and cells with the "visibility" property set to "hidden" are considered to have no visible content. Visible content includes "&nbsp;" (non-breaking-space) and other whitespace except ASCII CR ("\0D"), LF ("\0A"), tab ("\09"), and space ("\20").

#### 7.25.11 "ends-row"

XSL Definition:

Value: | true | false
Initial: | false
Applies to: | fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

true

  This cell ends a row.

false

  This cell does not end a row.

Specifies whether this cell ends a row. This is only allowed for table-cells that are not in table-rows.

#### 7.25.12 "number-columns-repeated"

XSL Definition:

Value: | <number>
Initial: | 1
Applies to: | fo:table-column
Inherited: | no
Percentages: | N/A
Media: | visual

<integer>

  A positive integer. If a negative or non-integer value is provided, the value will be rounded to the nearest integer value greater than or equal to 1.

The "number-columns-repeated" property specifies the repetition of a table-column specification n times; with the same effect as if the fo:table-column formatting object had been repeated n times in the result tree. The "column-number" property, for all but the first, is the column-number of the previous one plus its value of the "number-columns-spanned" property.

> NOTE:

> This handles HTML's "colgroup" element.

#### 7.25.13 "number-columns-spanned"

XSL Definition:

Value: | <number>
Initial: | 1
Applies to: | fo:table-column, fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

<integer>

  A positive integer. If a negative or non-integer value is provided, the value will be rounded to the nearest integer value greater than or equal to 1.

For an fo:table-column the "number-columns-spanned" property specifies the number of columns spanned by table-cells that may use properties from this fo:table-column formatting object using the from-table-column() function.

For an fo:table-cell the "number-columns-spanned" property specifies the number of columns which this cell spans in the column-progression-direction starting with the current column.

#### 7.25.14 "number-rows-spanned"

XSL Definition:

Value: | <number>
Initial: | 1
Applies to: | fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

<integer>

  A positive integer. If a negative or non-integer value is provided, the value will be rounded to the nearest integer value greater than or equal to 1.

The "number-rows-spanned" property specifies the number of rows which this cell spans in the row-progression-direction starting with the current row.

#### 7.25.15 "starts-row"

XSL Definition:

Value: | true | false
Initial: | false
Applies to: | fo:table-cell
Inherited: | no
Percentages: | N/A
Media: | visual

true

  This cell starts a row.

false

  This cell does not start a row.

Specifies whether this cell starts a row. This is only allowed for table-cells that are not in table-rows.

> NOTE:

> The "starts-row" and "ends-row" properties with a "true" value are typically used when the input data does not have elements containing the cells in each row, but instead, for example, each row starts at elements of a particular type.

#### 7.25.16 "table-layout"

CSS2 Definition:

Value: | auto | fixed | inherit
Initial: | auto
Applies to: | table
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/tables.html#propdef-table-layout.

fixed

  Use the fixed table layout algorithm

auto

  Use any automatic table layout algorithm

The "table-layout" property controls the algorithm used to lay out the table cells, rows, and columns.

#### 7.25.17 "table-omit-footer-at-break"

XSL Definition:

Value: | true | false
Initial: | false
Applies to: | fo:table
Inherited: | no
Percentages: | N/A
Media: | visual

true

  This property specifies that the footer should be omitted.

false

  This property specifies that the footer should not be omitted.

The "table-omit-footer-at-break" property specifies if a table whose last area is not at the end of an area produced by the table should end with the content of the fo:table-footer formatting object or not.

#### 7.25.18 "table-omit-header-at-break"

XSL Definition:

Value: | true | false
Initial: | false
Applies to: | fo:table
Inherited: | no
Percentages: | N/A
Media: | visual

true

  This property specifies that the header should be omitted.

false

  This property specifies that the header should not be omitted.

The "table-omit-header-at-break" property specifies if a table whose first area is not at the beginning of an area produced by the table should start with the content of the fo:table-header formatting object or not.

### 7.26 Writing-mode-related Properties

The properties in this section control the setting of the inline-progression-direction, the block-progression-direction and the orientation of the glyphs that are placed on a baseline in the inline-progression-direction. The "writing-mode" property sets both the "inline-progression-direction" and the "block-progression-direction"s.

The glyph orientation properties, "glyph-orientation-horizontal" and "glyph-orientation-vertical" set the orientation of the glyph relative to the default glyph orientation. The default orientation for glyphs is with the top of the glyph oriented toward the top of the reference area of which the glyph area is a descendant; that is, the glyph orientation is the same as the reference-orientation of the reference area. Glyphs that are oriented at '90' or '-90' degrees from the reference-orientation are said to be rotated glyphs. Glyphs that are oriented 180 degrees from the reference-orientation are said to be inverted glyphs.

The "direction" property (which is controlled by the "unicode-bidi" property) only affects text in which the orientation of the glyphs is perpendicular to the dominant-baseline. For horizontal writing-modes, the "direction" property only affects character sequences that generate glyphs that are not rotated. For vertical writing-modes, the "direction" property only affects character sequences that generate glyphs that are rotated.

The following sample fragment of XML is used to illustrate the interaction between the "writing-mode," "direction" and "glyph-orientation-vertical" properties.

Markup of text in the next figure

In the XML markup of the figure above, the characters are represented by their presentation form (and not their Unicode character codes). The order in which the characters are depicted is their storage order. The Hebrew characters in the third line are (from left to right) the first four letters of the Hebrew alphabet: aleph, beth, gimel and daleth. The generic identifiers in the XML markup are arbitrary, but are intended to suggest a sequence of text with two embedded text spans.

The following figure shows the effect of specifying an assortment of values for the "direction" and "glyph-orientation-vertical" properties that are specified on the three elements in the above XML fragment. In all cases, the "writing-mode" is "tb-rl". And in all cases the Unicode Bidi Algorithm [UNICODE TR9] is applied to the characters that are the children or descendants of the <t> element, sometimes with explicit directional markup in terms of the "direction" property and other times using the intrinsic direction properties of the underlying characters. The Unicode Bidi Algorithm is applied as the last step of refinement (see [5 Property Refinement / Resolution]) and before mapping the characters to glyphs and applying any rotation due to a glyph-orientation value.

The figure shows seven possible presentations of the sample XML fragment, one with all glyphs having a vertical orientation and six with various combinations of a perpendicular glyph-orientation and direction. In the figure, the correct reading order of the glyphs (left-to-right for the Latin and right-to-left for the Hebrew sub-sequences) is shown by the (red) arrow that is placed on the alphabetic baseline under the glyphs.

The six combinations of the "direction" and "glyph-orientation-vertical" properties that generated cases (2) through (7) have the property that they preserve the correct reading order when the glyphs are viewed upright. For some of the cases, it is necessary to turn the page one way to view the glyphs of one language and the opposite way to view the glyphs of the other language in an upright position. The reading order is preserved by combining a visual re-ordering of the glyphs using the Unicode Bidi Algorithm with a glyph-orientation that ensures the proper reading order for the ordering of the glyphs that results from the Unicode Bidi Algorithm. Sometimes it is necessary to explicitly specify the "direction" property to force the desired visual ordering of the glyphs.

The property specifications that yield the six presentations are given in the table that follows the figure.

Achievable rotations of Bidi text

Table: Properties that produce the above figure
Elements/ Cases | <t> | <t-s1> | <t-s2>
(2) | writing-mode: tb-rl glyph-orientation-vertical: 0 | glyph-orientation-vertical: 90 | glyph-orientation-vertical: 90
(3) | writing-mode: tb-rl glyph-orientation-vertical: 0 | glyph-orientation-vertical: 90 | glyph-orientation-vertical: -90 unicode-bidi: bidi-override direction: ltr
(4) | writing-mode: tb-rl glyph-orientation-vertical: 0 | glyph-orientation-vertical: -90 unicode-bidi: bidi-override direction: rtl | glyph-orientation-vertical: -90 unicode-bidi: bidi-override direction: ltr
(5) | writing-mode: tb-rl glyph-orientation-vertical: 0 direction: rtl | glyph-orientation-vertical: -90 unicode-bidi: bidi-override | glyph-orientation-vertical: 90
(6) | writing-mode: tb-rl glyph-orientation-vertical: 0 direction: rtl | glyph-orientation-vertical: -90 unicode-bidi: bidi-override | glyph-orientation-vertical: -90 unicode-bidi: bidi-override direction: ltr
(7) | writing-mode: tb-rl glyph-orientation-vertical: 0 direction: rtl | glyph-orientation-vertical: 90 unicode-bidi: embed direction: ltr | glyph-orientation-vertical: 90

> NOTE:

> 1. Case (1) has no rotated text. This can occur either because "glyph-orientation-vertical" is set to "0" or because it is set to "auto" and all the characters in the string are the full width variants of the characters. If the orientation of the all glyphs is vertical, then there is no re-ordering of characters. If the "writing-mode" is set to "tb-lr" or "tb-rl" then the "direction" is set to "ltr" and correspondingly, a "writing-mode" set of "bt-lr" or "bt-rl" sets the "direction" to "rtl". Therefore, it is only necessary to explicitly set the "direction" property when it would be different than that set by setting the "writing-mode"; for example, cases (5) through (7).

> 2. Case (2) can either have the explicit property settings shown in the Table or the "glyph-orientation-vertical" property on the <t> element can have the value "auto" and the English and Hebrew characters can be half-width characters. (Of course, there are not any half-width Hebrew characters in real Unicode.) In this case, the re-ordering of characters comes from the bi-directional characters types that are assigned to each Unicode character: the Roman characters have type "L" for left to right and the Hebrew characters have type "R" for right to left.

> 3. Cases (5) through (7) all explicitly set the "direction" property to "rtl". This sets the paragraph embedding level for the Unicode Bidi Algorithm to be right to left. Even though the "direction" property is set to "rtl", the ideographic glyphs are not re-ordered because their orientation is not perpendicular to the dominant-baseline.

> 4. In cases (5) and (6) for the <t-s1> element, the "unicode-bidi" property is set to override even though there is no explicit specification for the "direction" property. The inherited value of the "direction" property (which is "rtl" in this case) is used.

> 5. In case (7) for the <t-s1> element, the "unicode-bidi" property is set to "embed". It is not necessary to use "bidi-override" because the bi-directional character type for the content of <t-s1> is already "L". (Using the value "bidi-override" would have the same effect as the "embed", however.) The embed resets the embedding level of the content of the <t-s1> to be left to right. Even the "embed" (and the specific setting of the "unicode-bidi" property) is not needed because the bi-directional character type, "L" of the English characters is sufficient to raise the embedding level and cause them to be ordered left to right. Setting the "direction" property to "ltr" is needed if the "unicode-bidi" property is other than "normal" because the inherited value of "direction" is "rtl".

If paired punctuation characters, such as parentheses, had been included in one of the text spans, then these characters may need to be "mirrored" as described in the Unicode Bidi Algorithm. Mirroring a character means reversing the direction the character faces; for example, mirroring a left parenthesis makes it into a right parenthesis. This insures that the mirrored characters always face the text they surround.

If the "glyph-orientation" of the characters to which the glyphs correspond is "90" and the embedding level in which the characters lie is odd, then the paired glyphs need to be mirrored. Alternatively, if the "glyph-orientation" of the characters to which the glyphs correspond is "-90" and the embedding level in which the characters lie is even, then the paired glyphs need to be mirrored. In the example above, parentheses that surround the Latin text would not be mirrored in cases (2), (3) and (8), but would need to be mirrored in cases (4) through (6). Conversely, parentheses that surround the Hebrew text would not be mirrored in cases (4) through (6), but would need to be mirrored in cases (2), (3), and (8).

Within a string of vertical text, when the value of the "glyph-orientation-vertical" property is "90", then each affected glyph is rotated 90 degrees clockwise. This rotation changes the way the rotated glyph is aligned. The horizontal alignment-point of the rotated glyph is aligned with the appropriate baseline from the vertical baseline-table. The appropriate baseline is the baseline identified by the "alignment-baseline" property of the character(s) that generate the glyph area. For example, if the "alignment-baseline" property is not explicitly specified, Latin glyphs are aligned to the (vertical) "alphabetic" baseline and some Indic glyphs are aligned to the (vertical) "hanging" baseline.

> NOTE:

> If a glyph, such as a ligature or syllabic glyph, is generated from more than one character, then all those characters must have the same value for the "alignment-baseline" property.

The positions of the (vertical) baselines are chosen to insure that the rotated glyphs will not protrude too far (if at all) outside the line area for the vertical line when the "line-stacking-strategy" property has the value "line-height" or "font-height". In this case, we will say the rotated text is well aligned in the vertical line area.

To preserve the property that rotated text in a vertical line is well aligned when the "glyph-orientation-vertical" property value is "-90", the vertical baseline-table must be reflected before the rotated text is aligned. Let C be the value of the offset to the "central" baseline in the baseline-table. A baseline-table is reflected by negating every offset in the baseline table (where negating "-N" yields "N") and adding 2 times C to each of the negated offsets. The "central" baseline is defined in [7.12 Area Alignment Properties].

This action is called "reflecting" because the offset from the original dominant baseline to any baseline in the reflected baseline-table places that baseline on the opposite side of the "central" baseline and the distance from the "central" baseline to that baseline is the same as was from the "central" baseline to that baseline in its original (un-reflected) position. In short, the positions of the baselines are reflected across the "central" baseline.

> NOTE:

> If X is the offset of baseline X and C is the offset of the "central" baseline, then -X+2*C = C+(C-X) . C+(C-X) is the offset of the "central" baseline plus the distance between the "central" baseline and baseline X, the baseline being reflected.

Reflecting is necessary, because both the "alphabetic" and the "hanging" baselines are near the outer edges of the vertical line area. If the glyph were simply rotated 180 degrees, then it would stick way out of the intended line area. This is prevented by reflecting the baselines for glyphs that are perpendicular to the dominant baseline and that are rotated 180 degrees from the direction for which that baseline was intended. This last statement applies as much to horizontal baselines as it does to vertical baselines.

The figure illustrates the positioning of rotated and inverted glyphs in both vertical and horizontal writing-modes. The three examples show first some glyphs typical of the writing mode and then some atypical glyphs in each of the possible orientations, 0, 90, 180 and -90 degrees, in that order. The alignment-point for each glyph is shown as a small "x" whose center is at the alignment-point.

Example 1 shows the "tb-rl" vertical writing-mode. It has the ideographic glyph for "country" as its normal glyph and the two letters sequence, "Ap" as the glyphs that are rotated. Note that in the default orientation (0 degrees) and in the inverted orientation, the full width Latin glyphs are used; in the two other orientations, the proportional Latin glyphs are used. There is a small amount of whitespace between the proportional and the full width Latin glyphs. The dominant baseline is the "central" baseline which is shown in blue. The reflected baseline table is shown for the last (-90 degree) rotation. Note that the position of the "central" baseline does not change when the baseline table is reflected. For the inverted glyphs and the glyphs with a -90 degree rotation, the start-edge of the rotated glyph is on the opposite side from where it is in the un-rotated glyph; hence, the alignment-point on that start edge is not on the edge where the font tables normally place it.

Examples 2 and 3 show the "lr-tb" horizontal writing-mode. They have the Latin glyph sequence, "Ap" as their normal glyphs. Example 2 rotates the syllabic Gurmukhi glyph for "ji" and example 3 rotates the ideographic glyph for "country". In example 2, the whole syllabic glyph is rotated as in indivisible unit. For the 90 and -90 degree rotations, the vertical alignment-point, aligning to the "central" baseline, is used in both Examples. Similarly, for the inverted glyph, the baseline table is reflected. For the glyphs with a 90 degree rotation and the inverted glyphs, the start-edge of the rotated glyph is on the opposite side from where it is in the un-rotated glyph; hence, the alignment-point on that start edge is not on the edge where the font tables normally place it.

#### 7.26.1 "direction"

CSS2 Definition:

Value: | ltr | rtl | inherit
Initial: | ltr
Applies to: | all elements, but see prose
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-direction.

This property specifies the base writing direction of blocks and the direction of embeddings and overrides (see [UNICODE TR9]) for the Unicode bidirectional algorithm. In addition, it specifies the direction of table column layout, the direction of horizontal overflow, and the position of an incomplete last line in a block in case of 'text-align: justify'.

Values for this property have the following meanings:

ltr

  Left to right direction.

rtl

  Right to left direction.

For the 'direction' property to have any effect on inline-level elements, the 'unicode-bidi' property's value must be 'embed' or 'override'.

> NOTE:

> The 'direction' property, when specified for table column elements, is not inherited by cells in the column since columns don't exist in the document tree. Thus, CSS cannot easily capture the "dir" attribute inheritance rules described in [HTML40], section 11.3.2.1.

XSL modifications to the CSS definition:

- The specific use of "direction" and "unicode-bidi" on inline objects is to set the inline-progression-direction to be used by the Unicode bidi algorithm. This direction may override the inline-progression-direction determined by the current writing-mode and the implicit direction determined by the Unicode bidirectional algorithm.

- To insure consistency with the "writing-mode" property, the "direction" property is initialized to the value that sets the same inline-progression-direction as is set by the "writing-mode" property whenever that "writing-mode" property sets that direction. If the "direction" property is explicitly specified on the same formatting object the value of the "direction" property will override the inline-progression-direction set by the "writing-mode".

- This property only has an effect on text in which the orientation of the glyphs is perpendicular to the inline-progression-direction. Therefore, vertical ideographic text with the initial value for "glyph-orientation-vertical" is not affected by this property; vertical text for which the "glyph-orientation-vertical" property has the value of "90" or "-90" degrees is affected.

  > NOTE:

  > When the inline-progression-direction is "tb", as is typical for vertical text, then this corresponds to a "lr" inline-progression-direction for text with a glyph-orientation of '90' degrees and an "rl" inline-progression-direction for text with a glyph-orientation of "-90" degrees.

- The "writing-mode" property is used on formatting objects that define blocks that generate reference-areas, including inline-containers. It establishes both the block-progression-direction and the inline-progression-direction. The "direction" property only changes the inline-progression-direction and is used primarily for formatting objects that generate inline areas that are not also reference areas. Use of the "direction" property for other formatting objects is deprecated in this specification.

- When mapping CSS to XSL, the XSL "writing-mode" property should be used rather than the "direction" property for all block-level directionality control. XSL's "writing-mode" should also be used for any inline-container or block-container objects. The "direction" property should be used only for control/overrides of the Unicode Bidi Algorithm on bidi-override formatting objects.

#### 7.26.2 "glyph-orientation-horizontal"

XSL Definition:

Value: | <angle> | inherit
Initial: | 0deg
Applies to: | fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

<angle>

  The angle is restricted to 0, 90, 180, and 270 degrees. The User Agent shall round the value of the angle to the closest of the permitted values.

  A value of "0deg" indicates that all glyphs are set with the top of the glyphs toward the top of the reference-area. The top of the reference-area is defined by the reference-area's reference-orientation.

  A value of "90deg" indicates a rotation of 90-degrees clockwise from the "0deg" orientation.

This property specifies the orientation of glyphs relative to the path direction specified by the 'writing-mode'. This property is applied only to text written in a horizontal writing-mode.

The value of this property affects both the alignment and width of the glyph-areas generated for the affected glyphs. If a glyph is oriented so that it is not perpendicular to the dominant-baseline, then the vertical alignment-point of the rotated glyph is aligned with the alignment-baseline appropriate to that glyph. The baseline to which the rotated glyph is aligned is the (horizontal) baseline identified by the "alignment-baseline" for the script to which the glyph belongs. The width of the glyph-area is determined from the vertical width font characteristic for the glyph.

#### 7.26.3 "glyph-orientation-vertical"

XSL Definition:

Value: | auto | <angle> | inherit
Initial: | auto
Applies to: | fo:character
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

auto

  - Fullwidth ideographic and fullwidth Latin text (excluding ideographic punctuation) will be set with a glyph-orientation of 0-degrees.

    Ideographic punctuation and other ideographic characters having alternate horizontal and vertical forms will use the vertical form of the glyph.

  - Text which is not fullwidth will be set with a glyph-orientation of 90-degrees.

    This reorientation rule applies only to the first-level non-ideographic text. All further embedding of writing-modes or bidi processing will be based on the first-level rotation.

    > NOTE:

    > - This is equivalent to having set the non-ideographic text string horizontally honoring the bidi-rule, then rotating the resultant sequence of inline-areas (one area for each change of glyph direction) 90-degrees clockwise.

    >   It should be noted that text set in this "rotated" manner may contain ligatures or other glyph combining and reordering common to the language and script. (This "rotated" presentation form does not disable auto-ligature formation or similar context-driven variations.)

    > - The determination of which characters should be auto-rotated may vary across User Agents. The determination is based on a complex interaction between country, language, script, character properties, font, and character context. It is suggested that one consult the Unicode TR 11 and the various JIS or other national standards.

<angle>

  The angle is restricted to 0, 90, 180, and 270 degrees. The User Agent shall round the value of the angle to the closest of the permitted values.

  A value of "0deg" indicates that all glyphs are set with the top of the glyphs toward the top of the reference-area. The top of the reference-area is defined by the reference-area's reference-orientation.

  A value of "90deg" indicates a rotation of 90-degrees clockwise from the "0deg" orientation.

This property specifies the orientation of glyphs relative to the path direction specified by the writing-mode. This property is applied only text written with an inline-progression-direction top-to-bottom or bottom-to-top.

Its most common usage is to differentiate between the preferred orientation of alphabetic text in vertically written Japanese documents (glyph-orientation="auto") vs. the orientation of alphabetic text in western signage and advertising (glyph-orientation="0deg").

The value of this property affects both the alignment and width of the glyph-areas generated for the affected glyphs. If a glyph is oriented so that it is perpendicular to the dominant-baseline, then the horizontal alignment-point of the rotated glyph is aligned with the alignment-baseline appropriate to that glyph. The baseline to which the rotated glyph is aligned is the (vertical) baseline identified by the "alignment-baseline" for the script to which the glyph belongs. The width of the glyph-area is determined from the horizontal width font characteristic for the glyph.

#### 7.26.4 "text-altitude"

XSL Definition:

Value: | use-font-metrics | <length> | inherit
Initial: | use-font-metrics
Applies to: | fo:block, fo:character, fo:leader
Inherited: | no
Percentages: | refer to font's em-height
Media: | visual

Values have the following meanings:

use-font-metrics

  Uses a value for the "height" of the font above the dominat baseline, calculated as the distance between the text-before baseline and the dominant baseline, obtained from the nominal font for fo:block, fo:character, and fo:leader when the leader-pattern does not have the value "use-content". For fo:leader, when the leader-pattern has the value "use-content", it is obtained from the nominal font of the first child.

<length>

  Replaces the "height" value found in the font.

Specifies the "height" to be used for the ascent above the dominant baseline.

#### 7.26.5 "text-depth"

XSL Definition:

Value: | use-font-metrics | <length> | inherit
Initial: | use-font-metrics
Applies to: | fo:block, fo:character, fo:leader
Inherited: | no
Percentages: | refer to font's em-height
Media: | visual

Values have the following meanings:

use-font-metrics

  Uses a value for the "depth" of the font below the baseline, calculated as the distance between the dominant baseline and the text-after baseline, obtained from the nominal font for fo:block, fo:character, and fo:leader when the leader-pattern does not have the value "use-content". For fo:leader, when the leader-pattern has the value "use-content", it is obtained from the nominal font of the first child.

<length>

  Replaces the "depth" value found in the font.

Specifies the "depth" to be used for the descent below the domiant baseline.

#### 7.26.6 "unicode-bidi"

CSS2 Definition:

Value: | normal | embed | bidi-override | inherit
Initial: | normal
Applies to: | all elements, but see prose
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-unicode-bidi.

Values have the following meanings:

normal

  The element does not open an additional level of embedding with respect to the bidirectional algorithm.

  For inline-level elements, implicit reordering works across element boundaries.

embed

  If the element is inline-level, this value opens an additional level of embedding with respect to the bidirectional algorithm. The direction of this embedding level is given by the 'direction' property. Inside the element, reordering is done implicitly. This corresponds to adding a LRE (U+202A; for 'direction: ltr') or RLE (U+202B; for 'direction: rtl') at the start of the element and a PDF (U+202C) at the end of the element.

bidi-override

  If the element is inline-level or a block-level element that contains only inline-level elements, this creates an override. This means that inside the element, reordering is strictly in sequence according to the 'direction' property; the implicit part of the bidirectional algorithm is ignored. This corresponds to adding a LRO (U+202D; for 'direction: ltr') or RLO (U+202E; for 'direction: rtl') at the start of the element and a PDF (U+202C) at the end of the element.

The final order of characters in each block-level element is the same as if the bidi control codes had been added as described above, markup had been stripped, and the resulting character sequence had been passed to an implementation of the Unicode bidirectional algorithm for plain text that produced the same line-breaks as the styled text. In this process, non-textual entities such as images are treated as neutral characters, unless their 'unicode-bidi' property has a value other than 'normal', in which case they are treated as strong characters in the 'direction' specified for the element.

Please note that in order to be able to flow inline boxes in a uniform direction (either entirely left-to-right or entirely right-to-left), more inline boxes (including anonymous inline boxes) may have to be created, and some inline boxes may have to be split up and reordered before flowing.

Because the Unicode algorithm has a limit of 15 levels of embedding, care should be taken not to use 'unicode-bidi' with a value other than 'normal' unless appropriate. In particular, a value of 'inherit' should be used with extreme caution. However, for elements that are, in general, intended to be displayed as blocks, a setting of 'unicode-bidi: embed' is preferred to keep the element together in case display is changed to inline.

XSL modifications to the CSS definition:

The phrasing of the first paragraph of the general description (following the value breakouts) should read "The final order of presentation of the characters...".

In Unicode 3.0, the Unicode Consortium has increased the limit of the levels of embedding to 61 (definition BD2 in [UNICODE TR9]).

Fallback:

If it is not possible to present the characters in the correct order, then the User Agent should display either and "unsupported character glyph" or display some indication that the content cannot be correctly rendered.

#### 7.26.7 "writing-mode"

XSL Definition:

Value: | lr-tb | rl-tb | tb-rl | lr | rl | tb | inherit
Initial: | lr-tb
Applies to: | see prose
Inherited: | yes (see prose)
Percentages: | N/A
Media: | visual

> NOTE:

> This version of the writing-mode property covers the base writing-modes that are used as the official languages of the United Nations. For information regarding additional writing-modes, please see the "Internationalization Appendix".

Values have the following meanings:

lr-tb

  Inline components and text within a line are written left-to-right. Lines and blocks are placed top-to-bottom.

  > NOTE:

  > Typically, this is the writing-mode for normal "alphabetic" text.

  Establishes the following directions:

  - inline-progression-direction to left-to-right

    If any right-to-left reading characters are present in the text, the inline-progression-direction for glyph-areas may be further modified by the Unicode bidi algorithm.

  - block-progression-direction to top-to-bottom

  - shift-direction to bottom-to-top

rl-tb

  Inline components and text within a line are written right-to-left. Lines and blocks are placed top-to-bottom.

  > NOTE:

  > Typically, this writing mode is used in Arabic and Hebrew text.

  Establishes the following directions:

  - inline-progression-direction to right-to-left

    If any left-to-right reading characters or numbers are present in the text, the inline-progression-direction for glyph-areas may be further modified by the Unicode bidi algorithm.

  - block-progression-direction to top-to-bottom

  - shift-direction to bottom-to-top

tb-rl

  Inline components and text within a line are written top-to-bottom. Lines and blocks are placed right-to-left.

  > NOTE:

  > Typically, this writing mode is used in Chinese and Japanese text.

  Establishes the following directions:

  - inline-progression-direction to top-to-bottom

  - block-progression-direction to right-to-left

  - shift-direction to left-to-right

lr

  Shorthand for lr-tb.

rl

  Shorthand for rl-tb.

tb

  Shorthand for tb-rl.

The "writing-mode" property applies only to formatting objects that set up a reference-area (for XSL these are: fo:simple-page-master, fo:region-*, fo:table, fo:block-container, and fo:inline-container. Each value of writing-mode sets all three of the direction traits indicated in each of the value descriptions above on the reference-area. (See the area model for a description of the direction traits and their usage.)

- When "writing-mode" is applied to the simple-page-master, it is used to determine the placement of the five regions on the master.

- When "writing-mode" is applied to the fo:*-region, it defines the column-progression within each region. The inline-progression-direction is used to determine the stacking direction for columns (and the default flow order of text from column-to-column).

- To change the "writing-mode" within an fo:flow or fo:static-content, either the fo:block-container or the fo:inline-container, as appropriate, should be used.

  If one only wishes to change the inline-progression-direction to override the Unicode bidi-rule, one need not use an fo:inline-container. Instead, one may use the "direction" property on the fo:bidi-override.

- When "writing-mode" is applied to the fo:table, it controls the layout of the rows and columns. Table-rows use the block-progression-direction as the row-stacking direction. The inline-progression-direction is used to determine the stacking direction for columns (and cell order within the row).

Implementations must support at least one of the "writing-mode" values defined in this Recommendation.

### 7.27 Miscellaneous Properties

#### 7.27.1 "content-type"

XSL Definition:

Value: | <string> | auto
Initial: | auto
Applies to: | fo:external-graphic, fo:instream-foreign-object
Inherited: | no
Percentages: | N/A
Media: | visual

This property specifies the content-type and may be used by a User Agent to select a rendering processor for the object.

Values for this property have the following meanings:

auto

  No identification of the content-type. The User Agent may determine it by "sniffing" or by other means.

<string>

  A specification of the content-type in terms of either a mime-type or a namespace.

  A mime-type specification has the form "content-type:" followed by a mime content-type, e.g., content-type="content-type:xml/svg".

  A namespace specification has the form "namespace-prefix:" followed by a declared namespace prefix, e.g., content-type="namespace-prefix:svg". If the namespace prefix is null, the content-type refers to the default namespace.

#### 7.27.2 "id"

XSL Definition:

Value: | <id>
Initial: | see prose
Applies to: | all formatting objects
Inherited: | no, see prose
Percentages: | N/A
Media: | all

Values have the following meanings:

<id>

An identifier unique within all objects in the result tree with the fo: namespace. It allows references to this formatting object by other objects.

The "inherit" value is not allowed on this property.

The initial value of this property is random and unique identifier. The algorithm to generate this identifier is system-dependent.

#### 7.27.3 "provisional-label-separation"

XSL Definition:

Value: | <length> | inherit
Initial: | 6.0pt
Applies to: | fo:list-block
Inherited: | yes
Percentages: | refer to width of the containing box
Media: | visual

Values have the following meanings:

<length>

  Specifies the provisional distance between the end of the list-item-label and the start of the list-item-body. The value is not directly used during formatting, but is used in the computation of the value of the label-end variable.

> NOTE:

> label-end() = width of the content-rectangle of the reference-area into which the list-block is placed - (the value of the provisional-distance-between-starts + the value of the start-indent - the value of the provisional-label-separation) of the closest ancestor fo:list-block.

#### 7.27.4 "provisional-distance-between-starts"

XSL Definition:

Value: | <length> | inherit
Initial: | 24.0pt
Applies to: | fo:list-block
Inherited: | yes
Percentages: | refer to width of the containing box
Media: | visual

Values have the following meanings:

<length>

  Specifies the provisional distance between the start-indent of the list-item-label and the start-indent of the list-item-body. The value is not directly used during formatting, but is used in the computation of the value of the body-start variable.

> NOTE:

> body-start() = the value of the start-indent + the value of the provisional-distance-between-starts of the closest ancestor fo:list-block.

#### 7.27.5 "ref-id"

XSL Definition:

Value: | <idref> | inherit
Initial: | none, value required
Applies to: | fo:page-number-citation
Inherited: | no
Percentages: | N/A
Media: | all

Values have the following meanings:

<idref>

  The "id" of an object in the formatting object tree.

Reference to the object having the specified unique identifier.

#### 7.27.6 "score-spaces"

XSL Definition:

Value: | true | false | inherit
Initial: | true
Applies to: | fo:bidi-override, fo:character, fo:initial-property-set, fo:page-number, fo:page-number-citation
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

true

  Text-decoration will be applied to spaces

false

  Text-decoration will not be applied to spaces

Specifies whether the text-decoration property shall be applied to spaces.

#### 7.27.7 "src"

XSL Definition:

Value: | <uri-specification> | inherit
Initial: | none, value required
Applies to: | fo:external-graphic
Inherited: | no
Percentages: | N/A
Media: | visual

Values have the following meanings:

<uri-specification>

Specifies the URI reference to locate an external resource such as image/graphic data to be included as the content of this object, or color-profile data.

#### 7.27.8 "visibility"

CSS2 Definition:

Value: | visible | hidden | collapse | inherit
Initial: | visible
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visufx.html#propdef-visibility.

The 'visibility' property specifies whether the boxes generated by an element are rendered. Invisible boxes still affect layout (set the 'display' property to 'none' to suppress box generation altogether). Values have the following meanings:

visible

  The generated box is visible.

hidden

  The generated box is invisible (fully transparent), but still affects layout.

collapse

  Please consult the section on dynamic row and column effects in tables. If used on elements other than rows or columns, "collapse" has the same meaning as "hidden".

This property may be used in conjunction with scripts to create dynamic effects.

XSL modifications to the CSS definition:

Changed initial value to visible; (it is "inherit" in CSS).

#### 7.27.9 "z-index"

CSS2 Definition:

Value: | auto | <integer> | inherit
Initial: | auto
Applies to: | positioned elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-z-index.

For a positioned box, the "z-index" property specifies:

1. The stack level of the box in the current stacking context.

2. Whether the box establishes a local stacking context.

Values have the following meanings:

auto

  The stack level of the generated box in the current stacking context is the same as its parent's box. The box does not establish a new local stacking context.

<integer>

  This integer is the stack level of the generated box in the current stacking context. The box also establishes a local stacking context in which its stack level is "0".

This example [see the CSS specification] demonstrates the notion of transparency. The default behavior of a box is to allow boxes behind it to be visible through transparent areas in its content. In the example, each box transparently overlays the boxes below it. This behavior can be overridden by using one of the existing background properties.

### 7.28 Shorthand Properties

The following properties are all shorthand properties. Shorthands are only included in the highest XSL conformance level: "complete".

#### 7.28.1 "background"

CSS2 Definition:

Value: | [<background-color> || <background-image> || <background-repeat> || <background-attachment> || <background-position> ]] | inherit
Initial: | not defined for shorthand properties
Applies to: | all elements
Inherited: | no
Percentages: | allowed on 'background-position'
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background.

The "background" property is a shorthand property for setting the individual background properties (i.e., background-color, background-image, background-repeat, background-attachment and background-position) at the same place in the stylesheet.

The "background" property first sets all the individual background properties to their initial values, then assigns explicit values given in the declaration.

#### 7.28.2 "background-position"

CSS2 Definition:

Value: | [ [<percentage> | <length> ]{1,2} | [ [top | center | bottom] || [left | center | right] ] ] | inherit
Initial: | 0% 0%
Applies to: | block-level and replaced elements
Inherited: | no
Percentages: | refer to the size of the box itself
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background-position.

If a "background-image" has been specified, this property specifies its initial position.

<percentage> <percentage>

  With a value pair of 0% 0%, the upper left corner of the image is aligned with the upper left corner of the box's padding edge. A value pair of 100% 100% places the lower right corner of the image in the lower right corner of padding area. With a value pair of 14% 84%, the point 14% across and 84% down the image is to be placed at the point 14% across and 84% down the padding area.

<length> <length>

  With a value pair of 2cm 2cm, the upper left corner of the image is placed 2cm to the right and 2cm below the upper left corner of the padding area.

top left and left top

  Same as 0% 0%.

top, top center, and center top

  Same as 50% 0%.

right top and top right

  Same as 100% 0%.

left, left center, and center left

  Same as 0% 50%.

center and center center

  Same as 50% 50%.

right, right center, and center right

  Same as 100% 50%.

bottom left and left bottom

  Same as 0% 100%.

bottom, bottom center, and center bottom

  Same as 50% 100%.

bottom right and right bottom

  Same as 100% 100%.

If only one percentage or length value is given, it sets the horizontal position only, the vertical position will be 50%. If two values are given, the horizontal position comes first. Combinations of length and percentage values are allowed, (e.g., 50% 2cm). Negative positions are allowed. Keywords cannot be combined with percentage values or length values (all possible combinations are given above).

If the background image is fixed within the viewport (see the "background-attachment" property), the image is placed relative to the viewport instead of the elements padding area.

XSL modifications to the CSS definition:

The CSS property shall be treated as a shorthand by XSL and maps as follows:

<percentage>

  background-position-horizontal="<percentage>"

  background-position-vertical="50%"

<percentage1> <percentage2>

  background-position-horizontal="<percentage1>"

  background-position-vertical="<percentage2>"

<length>

  background-position-horizontal="<length>"

  background-position-vertical="50%"

<length1> <length2>

  background-position-horizontal="<length1>"

  background-position-vertical="<length2>"

<length> <percentage>

  background-position-horizontal="<length>"

  background-position-vertical="<percentage>"

<percentage> <length>

  background-position-horizontal="<percentage>"

  background-position-vertical="<length>"

top left and left top

  background-position-horizontal="0%"

  background-position-vertical="0%"

top, top center, and center top

  background-position-horizontal="50%"

  background-position-vertical="0%"

right top and top right

  background-position-horizontal="100%"

  background-position-vertical="0%"

left, left center, and center left

  background-position-horizontal="0%"

  background-position-vertical="50%"

center and center center

  background-position-horizontal="50%"

  background-position-vertical="50%"

right, right center, and center right

  background-position-horizontal="100%"

  background-position-vertical="50%"

bottom left and left bottom

  background-position-horizontal="0%"

  background-position-vertical="100%"

bottom, bottom center, and center bottom

  background-position-horizontal="50%"

  background-position-vertical="100%"

bottom right and right bottom

  background-position-horizontal="100%"

  background-position-vertical="100%"

#### 7.28.3 "border"

CSS2 Definition:

Value: | [ <border-width> || <border-style> || <color> ] | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border.

The "border" property is a shorthand property for setting the same width, color, and style for all four borders, top, bottom, left, and right, of a box. Unlike the shorthand "margin" and "padding" properties, the "border" property cannot set different values on the four borders. To do so, one or more of the other border properties must be used.

XSL modifications to the CSS definition:

Refer to [5.3.1 Border and Padding Properties] for information on the precedence order of properties.

#### 7.28.4 "border-bottom"

CSS2 Definition:

Value: | [ <border-top-width> || <border-style> || <color> ] | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-bottom.

A shorthand property for setting the width, style, and color of the bottom border of a block-area or inline-area.

#### 7.28.5 "border-color"

CSS2 Definition:

Value: | <color>{1,4} | transparent | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-color.

The 'border-color' property sets the color of the four borders. Values have the following meanings:

transparent

  The border is transparent (though it may have width).

<color>

  Any valid color specification.

The "border-color" property can have from one to four values, and the values are set on the different sides as for "border-width".

If an element's border color is not specified with a "border" property, user agents must use the value of the element's "color" property as the computed value for the border color.

XSL modifications to the CSS definition:

See the 'border-width' property for a description of how this property is interpreted when one through four values are provided.

#### 7.28.6 "border-left"

CSS2 Definition:

Value: | [ <border-top-width> || <border-style> || <color> ] | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-left.

A shorthand property for setting the width, style, and color of the left border of a block-area or inline-area.

#### 7.28.7 "border-right"

CSS2 Definition:

Value: | [ <border-top-width> || <border-style> || <color> ] | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-right.

A shorthand property for setting the width, style, and color of the right border of a block-area or inline-area.

#### 7.28.8 "border-style"

CSS2 Definition:

Value: | <border-style>{1,4} | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-style.

The "border-style" property sets the style of the four borders.

It can have from one to four values, and the values are set on the different sides.

XSL modifications to the CSS definition:

See the 'border-width' property for a description of how this property is interpreted when one through four values are provided.

#### 7.28.9 "border-spacing"

CSS2 Definition:

Value: | <length> <length>? | inherit
Initial: | 0pt
Applies to: | table
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/tables.html#propdef-border-spacing.

<length>

The lengths specify the distance that separates adjacent cell borders. If one length is specified, it gives both the horizontal and vertical spacing. If two are specified, the first gives the horizontal spacing and the second the vertical spacing. Lengths may not be negative.

In the separate borders model, each cell has an individual border. The "border-spacing" property specifies the distance between the borders of adjacent cells. This space is filled with the background of the table element. Rows, columns, row groups, and column groups cannot have borders (i.e., user agents must ignore the border properties for those elements).

XSL modifications to the CSS definition:

The CSS property shall be treated as a shorthand by XSL and maps as follows:

If one value is specified the "border-separation.block-progression-direction" and "border-separation.inline-progression-direction" are both set to that value.

If two values are specified the "border-separation.block-progression-direction" is set to the second value and "border-separation.inline-progression-direction" are both set to the first value.

#### 7.28.10 "border-top"

CSS2 Definition:

Value: | [ <border-top-width> || <border-style> || <color> ] | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-top.

A shorthand property for setting the width, style, and color of the top border of a block-area or inline-area.

#### 7.28.11 "border-width"

CSS2 Definition:

Value: | <border-width>{1,4} | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-border-width.

This property is a shorthand property for setting "border-top-width", "border-right-width", "border-bottom-width", and "border-left-width" at the same place in the stylesheet.

If there is only one value, it applies to all sides. If there are two values, the top and bottom borders are set to the first value and the right and left are set to the second. If there are three values, the top is set to the first value, the left and right are set to the second, and the bottom is set to the third. If there are four values, they apply to the top, right, bottom, and left, respectively.

#### 7.28.12 "cue"

CSS2 Definition:

Value: | <cue-before> || <cue-after> | inherit
Initial: | not defined for shorthand properties
Applies to: | all elements
Inherited: | no
Percentages: | N/A
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-cue.

#### 7.28.13 "font"

CSS2 Definition:

Value: | [ [ <font-style> || <font-variant> || <font-weight> ]? <font-size> [ / <line-height>]? <font-family> ] | caption | icon | menu | message-box | small-caption | status-bar | inherit
Initial: | see individual properties
Applies to: | all elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/fonts.html#propdef-font.

The "font" property is, except as described below, a shorthand property for setting "font-style", "font-variant", "font-weight", "font-size", "line-height", and "font-family", at the same place in the stylesheet. The syntax of this property is based on a traditional typographical shorthand notation to set multiple properties related to fonts.

All font-related properties are first reset to their initial values, including those listed in the preceding paragraph plus "font-stretch" and "font-size-adjust". Then, those properties that are given explicit values in the "font" shorthand are set to those values. For a definition of allowed and initial values, see the previously defined properties. For reasons of backward compatibility, it is not possible to set "font-stretch" and "font-size-adjust" to other than their initial values using the "font" shorthand property; instead, set the individual properties.

The following [first six] values refer to system fonts:

caption

  The font used for captioned controls (e.g., buttons, drop-downs, etc.).

icon

  The font used to label icons.

menu

  The font used in menus (e.g., dropdown menus and menu lists).

message-box

  The font used in dialog boxes.

small-caption

  The font used for labeling small controls.

status-bar

  The font used in window status bars.

System fonts may only be set as a whole; that is, the "font-family", "size", "weight", "style", etc. are all set at the same time. These values may then be altered individually if desired. If no font with the indicated characteristics exists on a given platform, the user agent should either intelligently substitute (e.g., a smaller version of the "caption" font might be used for the "smallcaption" font), or substitute a user agent default font. As for regular fonts, if, for a system font, any of the individual properties are not part of the operating system's available user preferences, those properties should be set to their initial values.

That is why this property is "almost" a shorthand property: system fonts can only be specified with this property, not with "font-family" itself, so "font" allows authors to do more than the sum of its sub-properties. However, the individual properties such as "font-weight" are still given values taken from the system font, which can be independently varied.

XSL modifications to the CSS definition:

In XSL the "font" property is a pure shorthand property. System font characteristics, such as font-family, and font-size, may be obtained by the use of the "system-font" function in the expression language.

#### 7.28.14 "margin"

CSS2 Definition:

Value: | <margin-width>{1,4} | inherit
Initial: | not defined for shorthand properties
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-margin.

A shorthand property for setting margin-top, margin-right, margin-bottom, and margin-left of a block-area or inline-area.

If there is only one value, it applies to all sides. If there are two values, the top and bottom margins are set to the first value and the right and left margins are set to the second. If there are three values, the top is set to the first value, the left and right are set to the second, and the bottom is set to the third. If there are four values, they apply to the top, right, bottom, and left, respectively.

XSL modifications to the CSS definition:

- Margin is provided for compatibility with CSS.

- Details on the mapping of CSS "margin" properties for XSL are given in [5 Property Refinement / Resolution].

#### 7.28.15 "padding"

CSS2 Definition:

Value: | <padding-width>{1,4} | inherit
Initial: | not defined for shorthand properties
Applies to: | all elements
Inherited: | no
Percentages: | refer to width of containing block
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/box.html#propdef-padding.

A shorthand property for setting padding-top, padding-bottom, padding-left, and padding-right of a block-area or inline-area.

If there is only one value, it applies to all sides. If there are two values, the top and bottom paddings are set to the first value and the right and left paddings are set to the second. If there are three values, the top is set to the first value, the left and right are set to the second, and the bottom is set to the third. If there are four values, they apply to the top, right, bottom, and left, respectively.

The surface color or image of the padding area is specified via the "background" property.

#### 7.28.16 "page-break-after"

CSS2 Definition:

Value: | auto | always | avoid | left | right | inherit
Initial: | auto
Applies to: | block-level elements, list-item, and table-row.
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/page.html#propdef-page-break-after.

Values for these properties have the following meanings:

auto

  Neither force nor forbid a page break before (after, inside) the generated box.

always

  Always force a page break before (after) the generated box.

avoid

  Avoid a page break before (after, inside) the generated box.

left

  Force one or two page breaks before (after) the generated box so that the next page is formatted as a left page.

right

  Force one or two page breaks before (after) the generated box so that the next page is formatted as a right page.

A potential page break location is typically under the influence of the parent element's 'page-break-inside' property, the 'page-break-after' property of the preceding element, and the 'page-break-before' property of the following element. When these properties have values other than 'auto', the values 'always', 'left', and 'right' take precedence over 'avoid'. See the section on allowed page breaks for the exact rules on how these properties may force or suppress a page break.

XSL modifications to the CSS definition:

The CSS property shall be treated as a shorthand by XSL and maps as follows:

auto

  break-after = "auto"

  keep-with-next = "auto"

always

  break-after = "page"

  keep-with-next = "auto"

avoid

  break-after = "auto"

  keep-with-next = "always"

left

  break-after = "even-page"

  keep-with-next = "auto"

right

  break-after = "odd-page"

  keep-with-next = "auto"

#### 7.28.17 "page-break-before"

CSS2 Definition:

Value: | auto | always | avoid | left | right | inherit
Initial: | auto
Applies to: | block-level elements, list-item, and table-row.
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/page.html#propdef-page-break-before.

Values for these properties have the following meanings:

auto

  Neither force nor forbid a page break before (after, inside) the generated box.

always

  Always force a page break before (after) the generated box.

avoid

  Avoid a page break before (after, inside) the generated box.

left

  Force one or two page breaks before (after) the generated box so that the next page is formatted as a left page.

right

  Force one or two page breaks before (after) the generated box so that the next page is formatted as a right page.

A potential page break location is typically under the influence of the parent element's 'page-break-inside' property, the 'page-break-after' property of the preceding element, and the 'page-break-before' property of the following element. When these properties have values other than 'auto', the values 'always', 'left', and 'right' take precedence over 'avoid'. See the section on allowed page breaks for the exact rules on how these properties may force or suppress a page break.

XSL modifications to the CSS definition:

The CSS property shall be treated as a shorthand by XSL and maps as follows:

auto

  break-before = "auto"

  keep-with-previous = "auto"

always

  break-before = "page"

  keep-with-previous = "auto"

avoid

  break-before = "auto"

  keep-with-previous = "always"

left

  break-before = "even-page"

  keep-with-previous = "auto"

right

  break-before = "odd-page"

  keep-with-previous = "auto"

#### 7.28.18 "page-break-inside"

CSS2 Definition:

Value: | avoid | auto | inherit
Initial: | auto
Applies to: | block-level elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/page.html#propdef-page-break-inside.

> NOTE:

> The CSS definition for page-break-inside was shared with the definitions of page-break-before and page-break-after. The text here has been edited to include only the value choices valid for page-break-inside and to remove the before/after/inside triplet.

Values for this property have the following meanings:

auto

  Neither force nor forbid a page break inside the generated box.

avoid

  Avoid a page break inside the generated box.

A potential page break location is typically under the influence of the parent element's 'page-break-inside' property, the 'page-break-after' property of the preceding element, and the 'page-break-before' property of the following element. When these properties have values other than 'auto', values 'always', 'left', and 'right' take precedence over 'avoid'. See the section on allowed page breaks for the exact rules on how these properties may force or suppress a page break.

XSL modifications to the CSS definition:

XSL treats this as a shorthand and maps it as follows.

auto

  keep-together = "auto"

avoid

  keep-together = "always"

#### 7.28.19 "pause"

CSS2 Definition:

Value: | [<time> | <percentage>]{1,2} | inherit
Initial: | depends on user agent
Applies to: | all elements
Inherited: | no
Percentages: | see descriptions of 'pause-before' and 'pause-after'
Media: | aural

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/aural.html#propdef-pause.

#### 7.28.20 "position"

CSS2 Definition:

Value: | static | relative | absolute | fixed | inherit
Initial: | static
Applies to: | all elements, but not to generated content
Inherited: | no
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-position.

Values have the following meanings:

static

  The box is a normal box, laid out according to the normal flow. The "left" and "top" properties do not apply.

relative

  The box's position is calculated according to the normal flow (this is called the position in normal flow). Then the box is offset relative to its normal position. When a box B is relatively positioned, the position of the following box is calculated as though B were not offset.

absolute

  The box's position (and possibly size) is specified with the "left", "right", "top", and "bottom" properties. These properties specify offsets with respect to the box's containing block. Absolutely positioned boxes are taken out of the normal flow. This means they have no impact on the layout of later siblings. Also, though absolutely positioned boxes have margins, they do not collapse with any other margins.

fixed

  The box's position is calculated according to the "absolute" model, but in addition, the box is fixed with respect to some reference. In the case of continuous media, the box is fixed with respect to the viewport (and doesn't move when scrolled). In the case of paged media, the box is fixed with respect to the page, even if that page is seen through a viewport (in the case of a print-preview, for example). Authors may wish to specify "fixed" in a media-dependent way. For instance, an author may want a box to remain at the top the viewport on the screen, but not at the top of each printed page.

Specifies the positioning scheme to be used.

XSL modifications to the CSS definition:

The CSS property shall be treated as a shorthand by XSL and maps as follows:

static

  relative-position="static"

  absolute-position="auto"

relative

  relative-position="relative"

  absolute-position="auto"

absolute

  relative-position="static"

  absolute-position="absolute"

fixed

  relative-position="static"

  absolute-position="fixed"

#### 7.28.21 "size"

CSS2 Definition:

Value: | <length>{1,2} | auto | landscape | portrait | inherit
Initial: | auto
Applies to: | the page context
Inherited: | N/A [XSL:no, is optional]
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/page.html#propdef-size.

This property specifies the size and orientation of a page box.

The size of a page box may either be "absolute" (fixed size) or "relative" (scalable, i.e., fitting available sheet sizes). Relative page boxes allow user agents to scale a document and make optimal use of the target size.

[The first] Three values for the 'size' property create a relative page box:

auto

  The page box will be set to the size and orientation of the target sheet.

landscape

  Overrides the target's orientation. The page box is the same size as the target, and the longer sides are horizontal.

portrait

  Overrides the target's orientation. The page box is the same size as the target, and the shorter sides are horizontal.

<length>

  Length values for the "size" property create an absolute page box. If only one length value is specified, it sets both the width and height of the page box (i.e., the box is a square). Since the page box is the initial containing block, percentage values are not allowed for the "size" property.

User agents may allow users to control the transfer of the page box to the sheet (e.g., rotating an absolute page box that's being printed).

- Rendering page boxes that do not fit a target sheet

  If a page box does not fit the target sheet dimensions, the user agent may choose to:

  - Rotate the page box 90 degrees if this will make the page box fit.

  - Scale the page to fit the target.

  The user agent should consult the user before performing these operations.

- Positioning the page box on the sheet

  When the page box is smaller than the target size, the user agent is free to place the page box anywhere on the sheet. However, it is recommended that the page box be centered on the sheet since this will align double-sided pages and avoid accidental loss of information that is printed near the edge of the sheet.

XSL modifications to the CSS definition:

This is treated as a CSS shorthand property that is mapped to XSL's "page-height" and "page-width" properties.

#### 7.28.22 "vertical-align"

CSS2 Definition:

Value: | baseline | middle | sub | super | text-top | text-bottom | <percentage> | <length> | top | bottom | inherit
Initial: | baseline
Applies to: | inline-level and 'table-cell' elements
Inherited: | no
Percentages: | refer to the 'line-height' of the element itself
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/visudet.html#propdef-vertical-align.

This property affects the vertical positioning inside a line box of the boxes generated by an inline-level element. The following values only have meaning with respect to a parent inline-level element, or to a parent block-level element, if that element generates anonymous inline boxes; they have no effect if no such parent exists.

> NOTE:

> Values of this property have slightly different meanings in the context of tables. Please consult the section on table height algorithms for details.

Values have the following meanings:

baseline

  Align the baseline of the box with the baseline of the parent box. If the box doesn't have a baseline, align the bottom of the box with the parent's baseline.

middle

  Align the vertical midpoint of the box with the baseline of the parent box plus half the x-height of the parent.

sub

  Lower the baseline of the box to the proper position for subscripts of the parent's box. (This value has no effect on the font size of the element's text.)

super

  Raise the baseline of the box to the proper position for superscripts of the parent's box. (This value has no effect on the font size of the element's text.)

text-top

  Align the top of the box with the top of the parent element's font.

text-bottom

  Align the bottom of the box with the bottom of the parent element's font.

top

  Align the top of the box with the top of the line box.

bottom

  Align the bottom of the box with the bottom of the line box.

<percentage>

  Raise (positive value) or lower (negative value) the box by this distance (a percentage of the "line-height" value). The value "0%" means the same as "baseline".

<length>

  Raise (positive value) or lower (negative value) the box by this distance. The value "0cm" means the same as "baseline".

> NOTE:

> Values of this property have slightly different meanings in the context of tables. Please consult the section on table height algorithms for details.

XSL modifications to the CSS definition:

The CSS property shall be treated as a shorthand by XSL and maps as follows:

baseline

  alignment-baseline="baseline"

  alignment-adjust="auto"

  baseline-shift="baseline"

  dominant-baseline="auto"

top

  alignment-baseline="top"

  alignment-adjust="auto"

  baseline-shift="baseline"

  dominant-baseline="auto"

text-top

  alignment-baseline="text-top"

  alignment-adjust="auto"

  baseline-shift="baseline"

  dominant-baseline="auto"

middle

  alignment-baseline="middle"

  alignment-adjust="auto"

  baseline-shift="baseline"

  dominant-baseline="auto"

bottom

  alignment-baseline="bottom"

  alignment-adjust="auto"

  baseline-shift="baseline"

  dominant-baseline="auto"

text-bottom

  alignment-baseline="text-bottom"

  alignment-adjust="auto"

  baseline-shift="baseline"

  dominant-baseline="auto"

sub

  alignment-baseline="baseline"

  alignment-adjust="auto"

  baseline-shift="sub"

  dominant-baseline="auto"

super

  alignment-baseline="baseline"

  alignment-adjust="auto"

  baseline-shift="super"

  dominant-baseline="auto"

<percentage>

  alignment-baseline="baseline"

  alignment-adjust="<percentage>"

  baseline-shift="baseline"

  dominant-baseline="auto"

<length>

  alignment-baseline="baseline"

  alignment-adjust="<length>"

  baseline-shift="baseline"

  dominant-baseline="auto"

#### 7.28.23 "white-space"

CSS2 Definition:

Value: | normal | pre | nowrap | inherit
Initial: | normal
Applies to: | block-level elements
Inherited: | yes
Percentages: | N/A
Media: | visual

CSS2 Reference: http://www.w3.org/TR/REC-CSS2/text.html#propdef-white-space.

This property declares how whitespace inside the element is handled. Values have the following meanings:

normal

  This value directs user agents to collapse sequences of whitespace, and break lines as necessary to fill line boxes. Additional line breaks may be created by occurrences of "\A" in generated content (e.g., for the BR element in HTML).

pre

  This value prevents user agents from collapsing sequences of whitespace. Lines are only broken at newlines in the source, or at occurrences of "\A" in generated content.

nowrap

  This value collapses whitespace as for 'normal', but suppresses line breaks within text except for those created by "\A" in generated content (e.g., for the BR element in HTML).

Conforming user agents may ignore the 'white-space' property in author and user style sheets but must specify a value for it in the default style sheet.

XSL modifications to the CSS definition:

XSL splits control of whitespace collapsing, space and linefeed handling, and wrapping into separate properties.

The CSS property shall be treated as a shorthand by XSL and maps as follows:

normal

  linefeed-treatment="treat-as-space"

  white-space-collapse="true"

  space-treatment="preserve"

  wrap-option="wrap"

pre

  linefeed-treatment="preserve"

  white-space-collapse="false"

  space-treatment="preserve"

  wrap-option="no-wrap"

nowrap

  linefeed-treatment="treat-as-space"

  white-space-collapse="true"

  space-treatment="preserve"

  wrap-option="no-wrap"

#### 7.28.24 "xml:lang"

XSL Definition:

Value: | <country-language> | inherit
Initial: | not defined for shorthand properties
Applies to: | see prose
Inherited: | yes
Percentages: | N/A
Media: | visual

Values have the following meanings:

<string>

  A language and/or country specifier in conformance with [RFC1766].

Specifies the language and country to be used by the formatter in linguistic services (such as hyphenation) and in the determination of line breaks. This affects line composition in a system-dependent way.

The string may be any RFC 1766 code.

XSL treats xml:lang as a shorthand and uses it to set the country and language properties.

> NOTE:

> In general, linguistic services (line-justification strategy, line-breaking and hyphenation) may depend on a combination of the "language", "script", and "country" properties.

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