18 User interface

Contents

  1. Cursors: the 'cursor' property
  2. User preferences for colors
  3. Other rendering issues that depend on user agents
    1. Magnification

18.1 Cursors: the 'cursor' property

'cursor'

Property name:'cursor' 
Value:auto | crosshair | default | pointer | move | e-resize | ne-resize | nw-resize | n-resize | se-resize | sw-resize | s-resize | w-resize| text | wait | help | <url>
Initial:auto
Applies to:all elements
Inherited:yes
Percentage values:N/A

This property specifies the type of cursor to be displayed for the mouse pointer. The values have the following meanings:

auto
The UA determines the cursor to display based on the current context.
crosshair
A simple crosshair
default
The platform-dependent default cursor (usually an arrow).
pointer
The cursor is a pointer that indicates a link.
move
Indicates something is to be moved
*-resize
Indicates that the edge is to be moved.
text
Indicates text that may be edited. Usually an I-bar.
wait
A cursor to indicate that the program is busy and the user should wait. Usually a watch or hourglass.
help
Help is available for the object under the cursor. Usually a question mark or a balloon.
<url>
The user agent should retrieve the cursor from the resource designated by the URL. It is considered an error if the resource is not a proper cursor. User agents may handle this error condition in different ways.

CSS2 does not allow users to specify animated cursors.

18.2 User preferences for colors

In addition to being able to assign pre-defined color values to text, backgrounds, etc. CSS2 allows authors to specify colors in a manner that integrates them into the user's graphic environment. For instance, color blind users may have their environment configured to avoid specific colors. Style rules that take into account user preferences thus offer the following advantages:

  1. They produce pages that fit the user's defined look and feel.
  2. They produce pages that may be more accessible as the current user settings may be related to a disability.

The set of values defined for system colors is intended to be exhaustive. For systems that do not expose a corresponding value, it should be mapped to the nearest system attribute, or to a default color.

The following lists additional values for color related CSS attributes and their general meaning. Any color property (e.g., 'color' or 'background-color') can take one of the following names:

activeborder
Active window border.
activecaption
Active window caption.
appworkspace
Background color of multiple document interface.
background
Desktop background.
buttonface
Face color for three-dimensional display elements.
buttonhighlight
Dark shadow for three-dimensional display elements (for edges facing away from the light source).
Shadow color for three-dimensional display elements.
buttontext
Text on push buttons.
captiontext
Text in caption, size box, and scroll bar arrow box.
graytext
Grayed (disabled) text. This color is set to #000 if the current display driver does not support a solid gray color.
highlight
Item(s) selected in a control.
highlighttext
Text of item(s) selected in a control.
inactiveborder
Inactive window border.
inactivecaption
Inactive window caption.
inactivecaptiontext
Color of text in an inactive caption.
infobackground
Background color for tooltip controls.
infotext
Text color for tooltip controls.
menu
Menu background.
menutext
Text in menus.
scrollbar
Scroll bar gray area.
threeddarkshadow
Dark shadow for three-dimensional display elements.
threedface
Face color for three-dimensional display elements.
threedhighlight
Highlight color for three-dimensional display elements.
threedlightshadow
Light color for three-dimensional display elements (for edges facing the light source).
threedshadow
Dark shadow for three-dimensional display elements.
window
Window background.
windowframe
Window frame.
windowtext
Text in windows.

For example, to set the foreground and background colors of a paragraph to the same foreground and background colors of the user's window, write the following:

P { color: windowtext; background-color: window }

18.3 Other rendering issues that depend on user agents

18.3.1 Magnification

The CSS working group considers that the magnification of a document or portions of a document should not be specified through style sheets. User agents may support such magnification in different ways (e.g., larger images, louder sounds, etc.)

When magnifying a page, UAs should preserve the relationships between positioned elements. For example, a comic strip may be composed of images with overlaid text elements. When magnifying this page, a user agent should keep the text within the comic strip balloon.