Techniques for WCAG 2.0

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HTML and XHTML Techniques for WCAG 2.0

This Web page lists HTML and XHTML Techniques from Techniques for WCAG 2.0: Techniques and Failures for Web Content Accessibility Guidelines 2.0. For information about the techniques, see Introduction to Techniques for WCAG 2.0. For a list of techniques for other technologies, see the Table of Contents.


Table of Contents



H2: Combining adjacent image and text links for the same resource

Applicability

HTML and XHTML documents that contain links.

This technique relates to:

Description

This objective of this technique is to avoid unnecessary duplication that occurs when adjacent text and iconic versions of a link are contained in a document.

Many kinds of links have both a text and iconic link adjacent to each other. Often the text and the icon link are rendered in separate links, in part to create a slight visual separation from each other. Visually they appear to be the same link, but they are experienced by many people as two identical links and this can be confusing. To avoid this, some authors omit alternative text from the image, but this would fail Success Criterion 1.1.1 because the text alternative would not serve the same purpose as the graphical link. The preferred method to address this is to put the text and image together in one link, and provide null alternative text on the image to eliminate duplication of text.

Sometimes the text and the icon link are rendered in separate, adjacent table cells to facilitate page layout. Although WCAG 2 does not prohibit the use of layout tables, CSS-based layouts are recommended in order to retain the defined semantic meaning of the HTML table elements and to conform to the coding practice of separating presentation from content. If CSS is used, this technique can be applied to combine the links.

Examples

Example 1

The icon and text are contained in the same a element.

Example Code:

 <a href="products.html">
   <img src="icon.gif" alt="" />
   Products page
 </a>      

Example 2

A link contains an icon and text, and the site help refers to the icon. The img has a text alternative which is the name used for the icon in the site help, which describes clicking the home page icon.

Example Code:

<a href="foo.htm">
  <img src="house.gif" alt="home page icon"/>
  Go to the home page
</a>     

Failure Example 3

This example demonstrates a failure to apply this technique. An icon and text link are side by side. The text alternative for the image is the same as the text link beside it, leading to a "stutter" effect as the link is read twice.

Example Code:

<a href="products.html">
   <img src="icon.gif" alt="Products page" />
 </a>
 <a href="products.html">
   Products page
 </a>  

Failure Example 4

This example demonstrates a failure to apply this technique. An icon and text link are side by side. In an attempt to remove the "stutter" the text alternative for the image is null. However, now one of the links has an unknown destination, which is its own link text problem.

Example Code:

<a href="products.html">
   <img src="icon.gif" alt="" />
 </a>
 <a href="products.html">
   Products page
 </a>     

Failure Example 5

This example demonstrates an incorrect implementation of this technique. The icon and text are contained in the same a element. However, the text alternative for the icon is a duplicate of the link text, leading to a "stutter" effect as the description is read twice.

Example Code:

<a href="products.html">
  <img src="products.gif" alt="Products page"/>
  Products page
</a>    
            

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For each a in the content that contains an img element:

  1. Check that there is no adjacent a element that has the same href attribute and the same description

For each a in the content that is contained in a table:

  1. Check that there is no a element in an adjacent table cell that has the same href attribute and the same description

Expected Results

  • All checks above are true.


H4: Creating a logical tab order through links, form controls, and objects

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to provide a logical tab order when the default tab order does not suffice. Often, G59: Placing the interactive elements in an order that follows sequences and relationships within the content is sufficient and this technique is not necessary. It can be very easy to introduce usability bugs when setting the tab order explicitly.

In some cases, the author may want to specify a tab order that follows relationships in the content without following the order of the interactive elements in the code. In these cases, an alternative order can be specified using the tabindex attribute of the interactive element. The tabindex is given a value between 0 and 32767.

When the interactive elements are navigated using the tab key, the elements are given focus in increasing order of the value of their tabindex attribute. Elements that have a tabindex value higher than zero will receive focus before elements without a tabindex or a tabindex of 0. After all of the elements with a tabindex higher than 0 have received focus, the rest of the interactive elements are given focus in the order in which they appear in the Web page.

Examples

Example 1

A genealogical search form searches for marriage records. The search form includes several input fields for the bride and the groom. The form is marked up using a data table that includes the fields of the groom in the first column and the fields of the bride in the second column. The order in the content is row by row but the author feels it is more logical to navigate the form column by column. This way, all the groom's criteria can be filled in before moving on to the bride's criteria. The tabindex attributes of the input fields are used to specify a tab order that navigates column by column.

Example Code:

<form action="#" method="post">
 <table summary="the first column contains the search criteria 
  of the groom, the second column the search criteria of 
  of the bride">
 <caption>Search for marriage records</caption>
 <tr>
   <th>Search criteria</th>
   <th>Groom</th>
   <th>Bride</th>
 </tr>
 <tr>
  <th>First name</th>
  <td><input type="text" size="30" value="" name="groomfirst" 
      title="First name of the groom" tabindex="1"></td>
  <td><input type="text" size="30" value="" name="bridefirst" 
       title="First name of the bride" tabindex="4"></td>
 </tr>
 <tr>
  <th>Last name</th>
  <td><input type="text" size="30" value="" name="groomlast" 
      title="Last name of the groom" tabindex="2"></td>
  <td><input type="text" size="30" value="" name="bridelast" 
      title="Last name of the bride" tabindex="5"></td>
 </tr>
 <tr>
  <th>Place of birth</th>
  <td><input type="text" size="30" value="" name="groombirth" 
      title="Place of birth of the groom" tabindex="3"></td>
  <td><input type="text" size="30" value="" name="bridebirth" 
      title="Place of birth of the bride" tabindex="6"></td>
 </tr>
</table>
</form>      

Example 2

A Web page contains a search field in the upper right corner. The field is given tabindex="1" so that it will occur first in the tab order, even though it is not first in the content order.

Example 3

Tabindex values need not be sequential nor must they begin with any particular value. The values do not have to be unique. Elements that have identical tabindex values are navigated in the order they appear in the character stream. So in the following example, the tab order would be one, three, two, four.

Example Code:

<a href="" tabindex="1">one</a>
 <a href="" tabindex="2">two</a>
 <a href="" tabindex="1">three</a>
 <a href="" tabindex="2">four</a>  

In sections of the content where the tab order follows the content order, it can be less error prone to give all elements the same tabindex value rather than specifying a different number for each element. Then it is easy to rearrange those elements or add new elements and maintain a logical tab order.

Example Code:

 <a href="xxx" tabindex = "1">First link in list</a>
<a href="xxx" tabindex = "1">Second link in list</a>
<a href="xxx" tabindex = "1">Link that was added long 
  after the original list was created</a>
<a href="xxx" tabindex = "1">Third link in list</a>
  ...
<a href="xxx" tabindex = "1">Twentieth link in list</a>      

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check if tabindex is used

  2. If tabindex is used, check that the tab order specified by the tabindex attributes follows relationships in the content.

Expected Results

  • Check #2 is true.


H24: Providing text alternatives for the area elements of image maps

Applicability

HTML and XHTML Documents that contain area elements.

This technique relates to:

User Agent and Assistive Technology Support Notes

The HTML 4.01 specification explains that the text of the alt attribute is to be displayed when the element cannot be rendered normally. User Agents will display the alt attribute text when images are not displayed. However, currently, visual User Agents do not display the alt attribute text for area elements of image maps when accessed by keyboard or when images are not displayed, and may clip the area elements if the intrinsic size of the image is not used. In addition, the display of alt attribute text in response to mouse-hover does not display in the font size or color combination set in the User Agent.

The title attribute is meant to provide additional information. However, current implementation in User Agents is access to either the title or alt attribute, but not both. User Agents generally will display the title attribute text when the mouse is placed over the element containing the title attribute. [begin delete]For example, Internet Explorer will display the alt text on mouse-over if there is no title text, Firefox and Opera only display the title text on mouse-over and do not use the alt attribute text for this purpose. Thus, to ensure the alt attribute text is visible on mouse-over, the same text should be used on the title attribute. [end delete]

Therefore, when using image maps, successful implementation of this technique would require either:

  • Ensuring the area element alt attribute value is displayed in response to attaining focus (including keyboard focus), and that this applies both to situations where images are loaded and not loaded. OR

  • A redundant mechanism serving the same purpose as the area elements is present in the Web Page.

Description

The objective of this technique is to provide text alternatives that serve the same purpose as the selectable regions of an image map. An image map is an image divided into selectable regions defined by area elements. Each area is a link to another Web page or another part of the current Web page. The alt attribute of each area element serves the same purpose as the selectable area of the image.

Examples

Example 1

This example uses the alt attribute of the area element to provide text that describes the purpose of the image map areas.

Example Code:

<img src="welcome.gif" usemap="#map1" 
    alt="Areas in the library. Select an area for
more information on that area." /> 
<map id="map1" name="map1">
  <area shape="rect" coords="0,0,30,30"
    href="reference.html" alt="Reference" />
  <area shape="rect" coords="34,34,100,100"
    href="media.html" alt="Audio visual lab" />
</map>   

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For each area element in an image map:

  1. Check that the area element has an alt attribute.

  2. Check that the text alternative specified by the alt attribute serves the same purpose as the part of image map image referenced by the area element of the imagemap.

Expected Results

  • The above checks are true.


H25: Providing a title using the title element

Applicability

HTML and XHTML

This technique relates to:

Description

All HTML and XHTML documents, including those in individual frames in a frameset, have a title element in the head section that defines in a simple phrase the purpose of the document. This helps users to orient themselves within the site quickly without having to search for orientation information in the body of the page.

Note that the (mandatory) title element, which only appears once in a document, is different from the title attribute, which may be applied to almost every HTML and XHTML element.

Examples

Example 1

This example defines a document's title.

Example Code:

<html xmlns="http://www.w3.org/1999/xhtml">   
   <head>     
      <title>The World Wide Web Consortium</title>     
   </head>   
   <body>     
      ...   
   </body> 
</html>  

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Examine the source code of the HTML or XHTML document and check that a non-empty title element appears in the head section.

  2. Check that the title element describes the document.

Expected Results

  • Checks 1 and 2 are true.


H27: Providing text and non-text alternatives for object

Applicability

Documents that load media with the object element, when the media format is not an accessibility-supported content technology.

This technique relates to:

User Agent and Assistive Technology Support Notes

This technique is not supported well by assistive technologies and cross-browser support is irregular.

Description

If object is used, provide a text alternative in the content of the element:

Examples

Example 1

This example shows a text alternative for a Java applet using the object element.

Example Code:

<object classid="java:Press.class" width="500" height="500">
  As temperature increases, the molecules in the balloon...
</object>     

Example 2

This example takes advantage of the fact the object elements may be nested to provide for alternative representations of information.

Example Code:

<object classid="java:Press.class" width="500" height="500">
  <object data="Pressure.mpeg" type="video/mpeg">
    <object data="Pressure.gif" type="image/gif">
      As temperature increases, the molecules in the balloon...
    </object>
  </object>
</object>  

Resources

Resources are for information purposes only, no endorsement implied.

HTML 4.01 OBJECT element

Tests

No tests available for this technique.


H28: Providing definitions for abbreviations by using the abbr and acronym elements

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

  • Assistive technologies provide different levels of support for speaking title attributes. Some do not include features that allow users to access information provided via the title attribute.

  • Implementing this technique with the title attribute is only sufficient if the title attribute is accessibility supported. The content of the title attribute needs to be available to all keyboard users (not only those with text-to-speech software) for this attribute to be accessibility supported.

  • JAWS 6.2 and higher and WindowEyes 5.0 and higher support the abbr and acronym elements. They can all be set to speak the title attribute when these elements are encountered, but this is not the default setting and is often not turned on by users.

  • Many graphical user agents render text enclosed within an abbr or acronym element with a dotted line below or surrounding it. In addition, when the mouse hovers over the element, the expansion is displayed as a tool tip.

  • In Internet Explorer 7 and below, items marked using the abbr element are not displayed with any additional formatting. For IE 6 and below, the expanded version does not display as a tooltip when the mouse hovers over the item.

  • Within a given user agent or assistive technology, abbr and acronym elements are presented to users in the same way.

Description

The objective of this technique is to provide expansions or definitions for abbreviations by using the abbr and acronym elements.

It is always appropriate to use the abbr element for any abbreviation, including acronyms and initialisms. When using HTML and XHTML, initialisms and acronyms may be marked up using the acronym element. XHTML 2.0 proposes eliminating the acronym element in favor of the more general abbr element.

Examples

Example 1: Using abbr element to expand abbreviations.

Example Code:

<p>Sugar is commonly sold in 5 <abbr title="pound">lb.<abbr> bags.</p>
<p>Welcome to the <abbr title="World Wide Web">WWW</abbr>!</p>              

Example 2: Using abbr element to define abbreviations.

Example Code:

<p>Tasini <abbr title="and others">et al.</abbr> <abbr title="versus">v.</abbr>
The New York Times <abbr title="and others">et al.</abbr> is the landmark lawsuit 
brought by members of the National Writers Union against ......</p>  

Example 3: Using the acronym element to expand an acronym

Example Code:

 <p>The use of <acronym title="Keep It Simple Stupid">KISS</acronym> became popular in ...</p>        
            

Example 4: Using the acronym element to expand an initialism

Example Code:

 <p><acronym title="World Wide Web">WWW</acronym></p>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check that an expansion or definition is provided for each abbreviation via abbr or acronym.

Expected Results

  • Check #1 is true.


H30: Providing link text that describes the purpose of a link for anchor elements

Applicability

HTML and XHTML documents that contain links, (<a href> elements)

This technique relates to:

Description

The objective of this technique is to describe the purpose of a link by providing descriptive text as the content of the a element. The description lets a user distinguish this link from other links in the Web page and helps the user determine whether to follow the link. The URI of the destination is generally not sufficiently descriptive.

When an image is the only content of a link, the text alternative for the image describes the unique function of the link.

When the content of a link contains both text and one or more images, if the text is sufficient to describe the purpose of the link, the images may have an empty text alternative. (See H67: Using null alt text and no title attribute on img elements for images that AT should ignore (HTML) .) When the images convey information beyond the purpose of the link, they must also have appropriate alt text.

Examples

Example 1

Describing the purpose of a link in HMTL in the text content of the a element.

Example Code:

<a href="routes.html">
  Current routes at Boulders Climbing Gym
</a>

Example 2

Using the alt attribute for the img element to describe the purpose of a graphical link.

Example Code:

<a href="routes.html">
   <img src="topo.gif" alt="Current routes at Boulders Climbing Gym" /> 
</a> 

Example 3

Using an empty alt attribute when the anchor (a) element contains text that describes the purpose of the link in addition to the img element. Note that the link text will appear on the page next to the image.

Example Code:

<a href="routes.html">
  <img src="topo.gif" alt="" />
  Current routes at Boulders Climbing Gym
</a>
[begin change]

Example 4

A site allows users to provide feedback on products, when the user is logged in, by clicking on the "Feedback" link in a product detail page. Other users or the product manufacturer are able to provide a response to any feedback. The feedback link displays an icon before the "Feedback" text when a response to the user's feedback is available. The help information describes this icon as a talking bubble containing quotation marks and includes the icon itself as an example. The icon's text alternative in the help text is "Response received icon". The same text alternative is used in the product detail pages (when a response is available) to allow identification of this icon through multiple modalities.

Example Code:

<a href="prod_123_feedback.htm">Feedback <img src="response.gif" width="15" height="15" alt="Response received icon" /></a>
[end change]

Example 5

A link contains text and an icon, and the icon provides additional information about the target.

Example Code:

<a href="WMFP.pdf">
Woodend Music Festival Program
<img src="pdficon.gif" alt="PDF format"/>
</a>
[begin add]

Example 6

The “MyCorp” company’s annual report is made available on the corporate website as a PDF file, and the annual corporate budget is made available as an Excel file on the web site.

Note: Many users prefer to know the file type when opening a file that results in opening a new application to view the file, so it is often regarded as useful to include this additional information. However, this is not required for compliance with this success criterion.

Example Code:

<p>
<a href=”2009mycorp_report.pdf”>MyCorp 2009 Annual Report (pdf)</a><br />
<a href=”2009mycorp_budget.xls”>MyCorp 2009 Annual Budget (Excel)</a>
</p>
[end add]

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For each link in the content that uses this technique:

  1. Check that text or a text alternative for non-text content is included in the a element

  2. If an img element is the only content of the a element, check that its text alternative describes the purpose of the link

  3. If the a element contains one or more img element(s) and the text alternative of the img element(s) is empty, check that the text of the link describes the purpose of the link

  4. If the a element only contains text, check that the text describes the purpose of the link

Expected Results

  • The above checks are true.


H32: Providing submit buttons

Applicability

Content that includes form controls.

This technique relates to:

Description

The objective of this technique is to provide a mechanism that allows users to explicitly request changes of context. The intended use of a submit button is to generate an HTTP request that submits data entered in a form, so it is an appropriate control to use for causing a change of context.

Examples

Example 1:

This is a basic example of a form with a submit button.

Example Code:


<form action="http://www.example.com/cgi/subscribe/" method="post"><br /> 
 <p>Enter your e-mail address to subscribe to our mailing list.</p><br /> 
 <label for="address">Enter email address:</label><input type="text" 
 id="address" name="address" /> 
 <input type="submit" value="Subscribe" /><br /> 
</form>

Example 2:

The following example uses a server-side script (specified in the action attribute) that redirects the user to the requested page.

Example Code:

 <form action="http://www.example.com/cgi/redirect/" method="get"><br /> 
    <p>Navigate the site.</p><br /> 
    <select name="dest"><br /> 
      <option value="/index.html">Home</option/><br /> 
      <option value="/blog/index.html">My blog</option/><br /> 
      <option value="/tutorials/index.html">Tutorials</option/><br /> 
      <option value="/search.html">Search</option/><br /> 
    </select><br /> 
  <input type="submit" value="Go to Page" /><br /> 
  </form> 

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Find all forms in the content

  2. For each form, check that it has a submit button (input type="submit", input type="image", or button type="submit")

Expected Results

  • #2 is true


H33: Supplementing link text with the title attribute

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

  • Current user agents and assistive technology provide no feedback to the user when links have title attribute content available.

  • Some graphical user agents will display a tool tip when the mouse hovers above an anchor element containing a title attribute. However, current user agents do not provide access to title attribute content via the keyboard.

  • The tool tip in some common user agents disappears after a short period of time (approximately 5 seconds). This can cause difficulty accessing title attribute content for those users who can use a mouse but have fine motor skill impairment, and may result in difficulties for users who need more time to read the tool tip.

  • Current graphical user agents do not provide mechanisms to control the presentation of title attribute content. The user cannot resize the tool tip text or control the foreground and background colors. The placement and location of the tool tip cannot be controlled by users, causing some screen magnifier users to be unable to access meaningful portions of the title attribute content because the tool tip cannot be fully displayed within the viewport.

  • Some user agents allow access to supplementary information through the context menu. For example, the keystroke combination Shift+F10 followed by P will display the title attribute content, along with other supplementary information in Mozilla/Firefox.

  • The HTML 4.01 specification explains that the text of the alt attribute is to be displayed when the element cannot be rendered normally. Thus, visual User Agents will display the alt attribute text when images are not displayed. The title attribute is meant to provide additional information. User Agents generally will display the title attribute text when the mouse is placed over the element containing the title attribute. Internet Explorer will display the alt text on mouse-over if there is no title text. The Firefox and Opera browsers only display the title text on mouse-over and do not use the alt attribute text for this purpose. [begin delete]Thus, if you want the alt attribute text visible on mouse-over, also include the text using the title attribute.[end delete]

  • Assistive technologies provide different levels of support for speaking title attributes. Some do not include features that allow users to access information provided via the title attribute.

  • JAWS 7.0 and above will speak the value of title attributes depending upon a JAWS setting. This setting can be changed temporarily or permanently within JAWS.

  • WindowEyes 5.5 and above has a hot key, ins-E, that will speak additional information, including the title attribute, for the item with focus.

  • Implementing this technique with the title attribute is only sufficient if the title attribute is accessibility supported. The content of the title attribute needs to be available to all keyboard users (not only those with text-to-speech software) for this attribute to be accessibility supported.

Description

The objective of this technique is to demonstrate how to use a title attribute on an anchor element to provide additional text describing a link. The title attribute is used to provide additional information to help clarify or further describe the purpose of a link. If the supplementary information provided through the title attribute is something the user should know before following the link, such as a warning, then it should be provided in the link text rather than in the title attribute.

Because of the extensive user agent limitations in supporting access to the title attribute, authors should use caution in applying this technique. For this reason, it is preferred that the author use technique C7: Using CSS to hide a portion of the link text (CSS) or H30: Providing link text that describes the purpose of a link for anchor elements (HTML) .

Examples

Example 1: Clarifying the purpose of a link

Example Code:

<a href="http://example.com/WORLD/africa/kenya.elephants.ap/index.html" 
   title="Read more about failed elephant evacuation">
   Evacuation Crumbles Under Jumbo load
</a>

Example 2: A link that opens in a new window

In HTML 4.01 the target="_blank" attribute can be used on an anchor element to indicate that the URI specified by the href attribute will be opened in a new window. This example shows using the title attribute of the anchor element to provide information that the link will be opened in a new window.

Example Code:

<a href="http://example.com/subscribe.html" 
     target="_blank" 
     title="link opens in new window">
     Subscribe to email notifications about breaking news
</a>

Resources

No resources available for this technique.

Tests

Procedure

Examine the source code for anchor elements.

  1. For each anchor element that has a title attribute, check that the title attribute together with the link text describes the purpose of the link.

Expected Results

  • Check #1 is true.


H34: Using a Unicode right-to-left mark (RLM) or left-to-right mark (LRM) to mix text direction inline

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to use Unicode right-to-left marks and left-to-right marks to override the HTML bidirectional algorithm when it produces undesirable results. This may be necessary, for instance, when placing neutral characters such as spaces or punctuation between different directional text runs. The concepts used in this technique are described in What you need to know about the bidi algorithm and inline markup.

Unicode right-to-left marks and left-to-right marks can be entered directly or by means of character entities or numeric character references, as shown here.

  • left-to-right mark: &lrm; or &#x200e; (U+200E)

  • right-to-left mark: &rlm; or &#x200f; (U+200F)

Due to the bidi algorithm, a source code editor may not display character entities or numeric character references as expected.

Examples

Example 1

This example shows an Arabic phrase in the middle of an English sentence. The exclamation point is part of the Arabic phrase and should appear on its left. Because it is between an Arabic and Latin character and the overall paragraph direction is LTR, the bidirectional algorithm positions the exclamation mark to the right of the Arabic phrase.

The title is "مفتاح معايير الويب!" in Arabic.

Visually-ordered ASCII version (RTL text in uppercase, LTR in lower):

the title is "HCTIWS SDRADNATS BEW!" in arabic.

Inserting a Unicode right-to-left mark in the code immediately after the exclamation mark positions it correctly when you view the displayed text (see below). You can use a character escape or the (invisible) control character to insert the right-to-left mark.

The title is "مفتاح معايير الويب!‏" in Arabic.

Visually-ordered ASCII version:

the title is "!HCTIWS SDRADNATS BEW" in arabic.

Resources

Tests

Procedure

  1. Examine the source for places where text changes direction.

  2. When text changes direction, check whether neutral characters such as spaces or punctuation occur adjacent to text that is rendered in the non-default direction.

  3. When #2 is true and the HTML bidirectional algorithm would produce the wrong placement of the neutral characters, check whether the neutral characters are followed by Unicode right-to-left or left-to-right marks that cause neutral characters to be placed as part of the preceding characters.

Expected Results

  • Check #3 is true.


H35: Providing text alternatives on applet elements

Applicability

HTML and XHTML Documents that load Java applets where applet is not deprecated.

This technique relates to:

User Agent and Assistive Technology Support Notes

  • This technique is not supported well by assistive technologies. The HTML specification explains that text alternatives for applets are to be displayed when the element cannot be rendered. Therefore, text alternatives that are included in the body of applet elements may not be available to users unless the user agent either does not support or has been configured not to render applets.

  • IE 6 for Windows and Firefox 1.5 and Opera 9 on Windows treat alternative text for the applet element differently. IE will display the body text of the applet element and not the alt attribute. Firefox and Opera will display the alt attribute but not the body text.

Description

Provide a text alternative for an applet by using the alt attribute to label an applet and providing the text alternative in the body of the applet element. In this technique, both mechanisms are required due to the varying support of the alt attribute and applet body text by user agents.

Examples

Example 1: An applet to play the tic-tac-toe game.

Example Code:

<applet code="tictactoe.class" width="250" height="250" alt="tic-tac-toe game">
   tic-tac-toe game
</applet>  

Tests

Procedure

  1. View the source code of the applet element

  2. Check that the applet element contains an alt attribute with a text alternative for the applet

  3. Check that the applet element contains a text alternative for the applet in the body of the applet element

Expected Results

  • Checks #2 and #3 are true.


H36: Using alt attributes on images used as submit buttons

Applicability

Applies to content using image-based submit buttons.

This technique relates to:

Description

For input elements of type 'image', the alt attribute of the input element is used to provide a functional label. This label indicates the button's function, but does not attempt to describe the image. The label is especially important if there are multiple submit buttons on the page that each lead to different results.

The input element is used to create many kinds of form controls. Although the HTML and XHTML DTDs permits the alt attribute on all of these, it should be used only on image submit buttons. User agent support for this attribute on other types of form controls is not well defined, and other mechanisms are used to label these controls.

Examples

Example 1

An input element with an alt attribute

Example Code:

<form action="http://example.com/prog/text-read" method="post">
  <input type="image" name="submit" src="button.gif" alt="Submit" />
</form>    

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. For all input elements that have a type attribute value of "image", check for the presence of an alt attribute.

  2. Check that the alt attribute indicates the button's function.

Expected Results

  • #1 and #2 are true


H37: Using alt attributes on img elements

Applicability

Images used within HTML documents.

This technique relates to:

Description

When using the img element, specify a short text alternative with the alt attribute. Note. The value of this attribute is referred to as "alt text".

When an image contains words that are important to understanding the content, the alt text should include those words. This will allow the alt text to play the same function on the page as the image. Note that it does not necessarily describe the visual characteristics of the image itself but must convey the same meaning as the image.

Examples

Example 1

An image on a Website provides a link to a free newsletter. The image contains the text "Free newsletter. Get free recipes, news, and more. Learn more." The alt text matches the text in the image.

Example Code:

<img src="newsletter.gif" alt="Free newsletter. 
   Get free recipes, news, and more. Learn more." />

Example 2

An image on a Web site depicts the floor plan of a building. The image is an image map with each room an interactive map area. The alt text is "The building's floor plan. Select a room for more information about the purpose or content of the room." The instruction to "select a room" indicates that the image is interactive.

Resources

Resources are for information purposes only, no endorsement implied.

HTML 4.01 IMG element

HTML 4.01 alt attribute

Tests

Procedure

  1. Examine each img element in the content

  2. Check that each img element which conveys meaning contains an alt attribute.

  3. If the image contains words that are important to understanding the content, the words are included in the text alternative.

Expected Results

Checks #2 and #3 are true.


H39: Using caption elements to associate data table captions with data tables

Applicability

HTML and XHTML data tables

This technique relates to:

Description

The objective of this technique is to programmatically associate captions for data tables where captions are provided in the presentation. The caption for a table is a table identifier and acts like a title or heading for the table.

The caption element is the appropriate markup for such text and it ensures that the table identifier remains associated with the table, including visually (by default). In addition, using the caption element allows screen reading software to navigate directly to the caption for a table if one is present.

The caption element may be used whether or not the table includes a summary attribute. The caption element identifies the table whereas the summary attribute gives an overview of the purpose or explains how to navigate the table. If both are used, the caption should not duplicate information in the summary.

Although WCAG 2.0 does not prohibit the use of layout tables, CSS-based layouts are recommended in order to retain the defined semantic meaning of the HTML and XHTML table elements and to conform to the coding practice of separating presentation from content. If a table is used for layout, the caption element is not used. The purpose of a layout table is simply to control the placement of content; the table itself is “transparent" to the user. A caption would "break" this transparency by calling attention to the table.

Examples

Example 1: An appointment calendar with a caption

Example Code:

<table>
<caption>Schedule for the week of March 6</caption>
...</table> 

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check for layout tables: determine whether the content has a relationship with other content in both its column and its row.

    1. If “no," the table is a layout table.

    2. If “yes," the table is a data table.

  2. If the table is a layout table, check that the table does not include a caption element.

  3. If the table is a data table and it includes a caption element, check that the caption identifies the table

  4. If both a summary attribute and a caption element are present for this data table, check that the summary does not duplicate the caption.

Expected Results

  • For layout tables, #2 is true.

  • For data tables, #3 and #4 are true.


H40: Using definition lists

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to provide the definitions of words or phrases by presenting them in a definition list. The list is marked up using the dl element. Within the list, each term is put in a separate dt element, and its definition goes in the dd element directly following it. The title attribute can be used to provide additional information about the definition list.

Using dl, dt, and dd ensures that relationships between terms and their definitions are preserved if the presentation format changes and that the list of terms and definitions is treated as a unit.

Definition lists are easiest to use when the definitions are put in alphabetical order. Definition lists are typically used in a glossary.

Examples

Example 1

A list of definitions of nautical terms used on a Website about sailing.

Example Code:

<dl title="Nautical terms">
  <dt>Knot</dt>
  <dd>
    <p>A <em>knot</em> is a unit of speed equaling 1 
      nautical mile per hour (1.15 miles per hour or 1.852 
      kilometers per hour).</p>
  </dd>
  <dt>Port</dt>
  <dd>
    <p><em>Port</em> is the nautical term (used on 
      boats and ships) that refers to the left side
      of a ship, as perceived by a person facing towards 
      the bow (the front of the vessel).</p>
  </dd>
  <dt>Starboard</dt>
  <dd>
    <p><em>Starboard</em> is the nautical term (used 
      on boats and ships) that refers to the right 
      side of a vessel, as perceived by a person 
      facing towards the bow (the front of the vessel).</p>
  </dd>
</dl>        

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For any set of words and their definitions that have the appearance of a list:

  1. Check that the list is contained within a dl element.

  2. Check that each word defined in the list is contained within a dt element.

  3. Check that the definition for each word appears in the dd element immediately following the word's dt element .

Expected Results

  • All checks above are true.


H42: Using h1-h6 to identify headings

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to use HTML and XHTML heading markup to convey the structure of the content.

Using headings merely to change the appearance of text does not convey the organization of the content, and may confuse users who use headings to perceive structure or rely on them for navigation. Conversely, while applying bold format, or even "class=heading", can result in the visual display of a heading, assistive technologies will not recognize such text as headings.

Examples

Example 1: Headings in a 3-column layout

In this example, the main content of the page is in the middle column of a 3-column page. The title of the main content matches the title of the page, and is marked as h1, even though it is not the first thing on the page. The content in the first and third columns is less important, and marked with h2.

Example Code:

<head>
 <title>Stock Market Up Today</title>
 </head>

 <body>

 <!-- left nav -->
 <div class="left-nav">
 <h2>Site Navigation</h2>
 <!-- content here -->
 </div>

 <!-- main contents -->
 <div class="main">
 <h1>Stock Market up today</h1>
 <!-- article text here -->
 </div>

 <!-- right panel -->
 <div class="left-nav">
 <h2>Related links</h2>
 <!-- content here -->
 </div>
 </body>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check that heading markup is used when content is a heading.

  2. Check that heading markup is not used when content is not a heading.

Expected Results

  • Checks #1 and #2 are true.


H43: Using id and headers attributes to associate data cells with header cells in data tables

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to associate each data cell (in a data table) with the appropriate headers. This technique adds a headers attribute to each data cell (td element). It also adds an id attribute to any cell used as a header for other cells. The headers attribute of a cell contains a list of the id attributes of the associated header cells. If there is more than one id, they are separated by spaces.

This technique is used when data cells are associated with more than one row and/or one column header. This allows screen readers to speak the headers associated with each data cell when the relationships are too complex to be identified using the th element alone or the th element with the scope attribute. Using this technique also makes these complex relationships perceivable when the presentation format changes.

This technique is not recommended for layout tables since its use implies a relationship between cells that is not meaningful when tables are used for layout.

Examples

Example 1: A table with multiple rows of headers

Example Code:

<table>
   <tr>
     <th rowspan="2" id="h">Homework</th>
     <th colspan="3" id="e">Exams</th>
     <th colspan="3" id="p">Projects</th>
   </tr>
   <tr>
     <th id="e1" headers="e">1</th>
     <th id="e2" headers="e">2</th>
     <th id="ef" headers="e">Final</th>
     <th id="p1" headers="p">1</th>
     <th id="p2" headers="p">2</th>
     <th id="pf" headers="p">Final</th>
   </tr>
   <tr>
    <td headers="h">15%</td>
    <td headers="e e1">15%</td>
    <td headers="e e2">15%</td>
    <td headers="e ef">20%</td>
    <td headers="p p1">10%</td>
    <td headers="p p2">10%</td>
    <td headers="p pf">15%</td>
   </tr>
  </table>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check for layout tables: determine whether the content has a relationship with other content in both its column and its row. If “no," the table is a layout table. If “yes," the table is a data table.

  2. For data tables, check that any cell that is associated with more than one row and/or one column header contains a headers attribute that lists the id for all headers associated with that cell.

  3. For data tables where any cell contains an id or headers attribute,

    1. Check that each id listed in the headers attribute of the data cell matches the id attribute of a cell that is used as a header element

    2. Check that the headers attribute of a data cell contains the id attribute of all headers associated with the data cell

    3. Check that all ids are unique (that is, no two elements in the page have the same id)

Expected Results

  • If table is a layout table, no cells contain headers or id attributes

  • If table is a data table and any cell contains an id attribute, checks #3.1, #3.2, and #3.3 are true.

  • If table is a data table and any cell is associated with more than one row and/or one column header, check #2 is true.


H44: Using label elements to associate text labels with form controls

Applicability

HTML and XHTML controls that use external labels

This technique relates to:

User Agent and Assistive Technology Support Notes

The HTML and XHTML specifications allow both implicit and explicit labels. However, some assistive technologies do not correctly handle implicit labels (for example, <label>First name <input type="text" name="firstname"></label>).

  • JAWS 7.10 was tested on Windows XP with Internet Explorer 6.0 and Firefox 1.5. It reads the label for explicit and implicit labels for text fields in both virtual PC cursor and forms reading mode. In forms mode it does not read the label for implicit labels on checkboxes and radio fields.

  • Window-Eyes 5.5 was tested on Windows XP with Internet Explorer 6.0 and Firefox 1.5. It will always speak the label for an explicitly labelled form field. It does not speak the label for the implicitly labelled form control in browse on mode but will speak the implicit label when navigating from control to control in browse off mode.

User agents will display a tool tip when the mouse hovers above an input element containing a title attribute. Title attributes are exposed to assistive technology and are displayed as tooltips in many graphical browsers. Tooltips can't be opened via the keyboard, so this information may not be available to sighted keyboard users.

If no label is available, JAWS and Window-Eyes speak the title attribute when the form control receives focus

  • JAWS 6.0 and later can be set to speak both label and title when the two items are different; however, very few users are aware of this setting.

  • WindowEyes 5.5 has a hot key, ins-E, that will display additional information, including the title attribute, for the item with focus.

Description

The objective of this technique is to use the label element to explicitly associate a form control with a label. A label is attached to a specific form control through the use of the for attribute. The value of the for attribute must be the same as the value of the id attribute of the form control.

The id attribute may have the same value as the name attribute, but both must be provided, and the id must be unique in the Web page.

This technique is sufficient for Success Criteria 1.1.1, 1.3.1 and 4.1.2 whether or not the label element is visible. That is, it may be hidden using CSS. However, for Success Criterion 3.3.2, the label element must be visible since it provides assistance to all users who need help understanding the purpose of the field.

Note that the label is positioned after input elements of type="checkbox" and type="radio".

Note 1: Elements that use explicitly associated labels are:

  • input type="text"

  • input type="checkbox"

  • input type="radio"

  • input type="file"

  • input type="password"

  • textarea

  • select

Note 2: The label element is not used for the following because labels for these elements are provided via the value attribute (for Submit and Reset buttons), the alt attribute (for image buttons), or element content itself (button).

  • Submit and Reset buttons (input type="submit" or input type="reset")

  • Image buttons (input type="image")

  • Hidden input fields (input type="hidden")

  • Script buttons (button elements or <input type="button">)

Examples

Example 1: A text input field

The text field in the example below has the explicit label of "First name:". The label element's for attribute matches the id attribute of the input element.

Example Code:

<label for="firstname">First name:</label> 
<input type="text" name="firstname" id="firstname" />

Example 2: A checkbox

Example Code:

<input type="checkbox" id="markuplang" name="computerskills" checked="checked">
<label for="markuplang">HTML</label>

Example 3: A group of radio buttons

A small, related group of radio buttons with a clear description and labels for each individual element.

Note: To provide clear associations and instructions for a large set of related radio buttons H71: Providing a description for groups of form controls using fieldset and legend elements , should be considered.

Example Code:

 <h1>Donut Selection</h1>

<p>Choose the type of donut(s) you would like then select 
   the "purchase donuts" button.</p>

<form action="http://example.com/donut" method="post">
<p>
  <input type="radio" name="flavor" id="choc" value="chocolate" />
    <label for="choc">Chocolate</label><br/>
  <input type="radio" name="flavor" id="cream" value="cream"/>
    <label for="cream">Cream Filled</label><br/>
  <input type="radio" name="flavor" id="honey" value="honey"/>
    <label for="honey">Honey Glazed</label><br/>
  <input type="submit" value="Purchase Donuts"/>
</p>
</form>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For all input elements of type text, file or password, for all textareas and for all select elements in the Web page:

  1. Check that there is a label element that identifies the purpose of the control before the input[begin add], textarea, or select[end add] element

  2. Check that the for attribute of the label element matches the id of the input[begin add], textarea, or select[end add] element

  3. Check that the label element is visible.

For all input elements of type checkbox or radio in the Web page::

  1. Check that there is a label element that identifies the purpose of the control after the input element

  2. Check that the for attribute of the label element matches the id of the input element

  3. Check that the label element is visible.

Expected Results

  • Checks #1 and #2 are true. For Success Criterion 3.3.2, Check #3 is also true.


H45: Using longdesc

Applicability

HTML and XHTML documents that include images that cannot be described in a short text alternative.

This technique relates to:

User Agent and Assistive Technology Support Notes

Some older assistive technologies do not support the longdesc attribute.

Description

The objective of this technique is to provide information in a file designated by the longdesc attribute when a short text alternative does not adequately convey the function or information provided in the image. The longdesc attribute is a URI, the target of which contains a long description of the non-text content.

Examples

Example 1

Example Code:

<p><img src="chart.gif" alt="a complex chart" longdesc="chartdesc.html"/></p>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check that the img element has a longdesc attribute.

  2. Check that the value of the longdesc attribute is a valid URI of an existing resource.

  3. Check that the content at the target of that URI contains a long description describing the original non-text content associated with it.

Expected Results

  • #1 through #3 are all true


H46: Using noembed with embed

Applicability

Documents that load plugins with the embed element.

This technique relates to:

User Agent and Assistive Technology Support Notes

Note: Although embed is widely supported in user agents - it is not a valid part of HTML or XHTML.

Description

The objective of this technique is to provide alternative content for the embed element in a noembed element. The noembed is rendered only if the embed is not supported. While it can be positioned anywhere on the page, it is a good idea to include it as a child element of embed so that it is clear to assistive technologies that a text alternative is associated with the embed element it describes.

Examples

Example 1: noembed is provided inside an embed

Example Code:

<embed src="../movies/history_of_rome.mov"
  height="60" width="144" autostart="false">
  <noembed>
    <a href="../transcripts/transcript_history_rome.htm">Transcript of "The history of Rome"</a>
  </noembed>
</embed>

Example 2: noembed is provided beside an embed

Example Code:

<embed src="moviename.swf" width="100" height="80"
  pluginspage="http://example.com/shockwave/download/" />
<noembed>
  <img alt="Still from Movie" src="moviename.gif" 
    width="100" height="80" />
</noembed>;

Resources

No resources available for this technique.

(none currently listed)

Tests

Procedure

  1. Check if embed element has a child noembed element

  2. Check if embed element has a noembed element that immediately follows it.

Expected Results

  • #1 is true or #2 is true


H48: Using ol, ul and dl for lists [begin add]or groups of links[end add]

Applicability

HTML, XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

Assistive technologies include inconsistent support for various uses of the type attribute used to indicate numbering and bullet styles.

Description

The objective of this technique is to create lists of related items using list elements appropriate for their purposes. The ol element is used when the list is ordered and the ul element is used when the list is unordered. Definition lists (dl) are used to group terms with their definitions. Although the use of this markup can make lists more readable, not all lists need markup. For instance, sentences that contain comma-separated lists may not need list markup.

When markup is used that visually formats items as a list but does not indicate the list relationship, users may have difficulty in navigating the information. An example of such visual formatting is including asterisks in the content at the beginning of each list item and using <br> elements to separate the list items.

Some assistive technologies allow users to navigate from list to list or item to item. Style sheets can be used to change the presentation of the lists while preserving their integrity.

[begin add]

The list structure (ul/ol) is also useful to group hyperlinks. When this is done, it helps screen reader users to navigate from the first item in a list to the end of the list or jump to the next list. This helps them to bypass groups of links if they choose to.

[end add]

Examples

Example 1: A list showing steps in a sequence

This example uses an ordered list to show the sequence of steps in a process.

Example Code:

 <ol>
  <li>Mix eggs and milk in a bowl.</li>
  <li>Add salt and pepper.</li>
</ol>

Example 2: A grocery list

This example shows an unordered list of items to buy at the store.

Example Code:

<ul>
  <li>Milk</li>
  <li>Eggs</li>
  <li>Butter</li>
</ul>

Example 3: A word and its definition

This example uses a definition list to group a definition with the term that is being defined.

Example Code:

<dl>
  <dt>blink</dt>
  <dd>turn on and off between .5 and 3 times per second
  </dd>
</dl> 
[begin add]

Example 4: Using lists to group links

In this example the links are grouped using the ul and li elements.

Example Code:

<a name="categories" id="categories"></a><h2>Product Categories</h2>
<ul class="navigation">
    <li><p><a href="kitchen.html">Kitchen</a></p></li>
    <li><p><a href="bedbath.html">Bed &amp; Bath</a></p></li>
    <li><p><a href="dining.html">Fine Dining</a></p></li>
    <li><p><a href="lighting.html">Lighting</a></p></li>
    <li><p><a href="storage.html">Storage</a><li><p>
</ul> 

CSS can be used to style the list elements, so this technique can be used with a variety of visual appearances.

Here is a style that removes the list bullets and the left padding that creates the indent and flows the individual list elements horizontally.

Example Code:

ul.navigation {
  list-style: none; 
  padding: 0;
}
ul.navigation li {
  display: inline;
}

This style removes the list bullets and the left padding and displays the items in a floating block.

Example Code:

 ul.navigation {
 list-style: none; 
 padding: 0;
}
ul.navigation li {
 display: block; 
 float: left;
}
[end add]

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check that content that has the visual appearance of a list (with or without bullets) is marked as an unordered list.

  2. Check that content that has the visual appearance of a numbered list is marked as an ordered list.

  3. Check that content is marked as a definition list when terms and their definitions are presented in the form of a list.

Expected Results

  • All the checks above are true.


H49: Using semantic markup to mark emphasized or special text

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

  • Some semantic elements are not supported well by assistive technologies. Elements and attributes that are known to have limited support include code, del, dfn, ins, kbd, s, sub, sup, tt, and q. For these elements, authors are encouraged to consider whether they are using them in a way that would require users to be able to access the semantic meaning of the markup in order to understand the content and, where understanding the semantics is required, to provide this information in text.

  • Most screen readers do not provide automatic notification about em, strong, b, or i.

  • JAWS contains support for blockquote and cite. WindowEyes contains support for blockquote, q and cite.

  • Firefox 1.0 (Windows) and higher, Opera 7.54 (Windows) and higher, Mozilla 1.7.3 (Windows) and higher automatically generate quotes around q elements, but Internet Explorer 6 for Windows does not.

[begin delete]

Firefox 1.0 (Windows) and higher, Opera 7.54 (Windows) and higher, Mozilla 1.7.3 (Windows) and higher automatically generate quotes around q elements, but Internet Explorer 6 for Windows does not.

[end delete]

Description

The objective of this technique is to demonstrate how semantic markup can be used to mark emphasized or special text so that it can be programmatically determined. Using semantic markup to mark emphasized or special text also provides structure to the document. User agents can then make the structure perceivable to the user, for example using a different visual presentation for different types of structures or by using a different voice or pitch in an auditory presentation.

Most user agents will visually distinguish text that has been identified using semantic markup. Some assistive technologies provide a mechanism for determining the characteristics of content that has been created using proper semantic markup.

Examples

See rendered examples of semantic text.

Example 1

This example shows how to use the em and strong elements to emphasize text. The em and strong elements were designed to indicate structural emphasis that may be rendered in a variety of ways (font style changes, speech inflection changes, etc.).

Example Code:

 ...What she <em>really</em> meant to say was, &quot;This is not ok, 
 it is <strong>excellent</strong>&quot;!... 

Example 2

This example shows using the blockquote element to mark up long quotations which may require paragraph breaks. It also demonstrates the use of the cite element to specify a reference.

Example Code:

<p>The following is an excerpt from the <cite>The Story of my Life</cite> by Helen Keller</p>
 <blockquote>
   <p>Even in the days before my teacher came, I used to feel along the square stiff boxwood
   hedges, and, guided by the sense of smell, would find the first violets and lilies.  
   There, too, after a fit of temper, I went to find comfort and to hide my hot face 
   in the cool leaves and grass.</p>
 </blockquote>

Example 3

Here is the use of the q element to mark up a shorter quotation. Quotes are provided around the q element, because many user agents do not support this element yet and therefore do not display it properly (see UA notes). CSS rules to suppress automatic generation of quotes are provided for those user agents that do support the q element, to prevent them from generating quotes automatically in addition to the quotes provided by the author, resulting in double-quoted content. In the future, when the q element is more broadly supported, the need to provide quotes and suppress browser-generated quotes will go away.

Example Code:

q:before { content: ""; } 
q:after { content: ""; }  

Example Code:

 <p>Helen Keller said, "<q>Self-pity is our worst enemy and if we yield to it, 
we can never do anything good in the world.</q>"</p>

Example 4

Superscripts and subscripts are created using the sup and sub elements.

Example Code:

 <p>Beth received 1<sup>st</sup> place in the 9<sup>th</sup> grade science competition.</p>
<p>The chemical notation for water is H<sub>2</sub>O.</p>

Resources

Tests

Procedure

  1. Examine the content for information that is conveyed through variations in presentation of text.

  2. Check that appropriate semantic markup (such as em, strong, cite, blockquote, quote, sub, and sup) have been used to mark the text that conveys information through variations in text.

Expected Results

  • Check #2 is true.


[begin change]

H50: Using map to group links

[end change]

Applicability

HTML and XHTML

This technique relates to:

Description

[begin change]

The objective of this technique is to demonstrate how to group links into logical sets using the map element. When links are grouped into logical sets (for example, in a navigation bar or main menu that appears on every page in a site) they should be marked up as a unit. Navigation bars are usually the first thing someone encounters on a page. People who are sighted are often able to ignore navigation parts and start reading the content of the page. Someone using a screen reader must first listen to the text of each link in the navigation bar before reading the interesting content. This technique uses the map element to mark up content so that a user with a screen reader can jump over the navigation bar and avoid reading all of the links.

[end change]
[begin delete]

Group links via one of the following mechanisms (in descending order of preference):

[end delete]
[begin delete]
  • ul or ol

  • map

[end delete]

Examples

[begin delete]

Example 1: Using lists to group links

In this example the links are grouped using the ul and li elements.

Example Code:

<a name="categories" id="categories"></a><h2>Product Categories</h2>
<ul class="navigation">
    <li><p><a href="kitchen.html">Kitchen</a></p></li>
    <li><p><a href="bedbath.html">Bed &amp; Bath</a></p></li>
    <li><p><a href="dining.html">Fine Dining</a></p></li>
    <li><p><a href="lighting.html">Lighting</a></p></li>
    <li><p><a href="storage.html">Storage</a><li><p>
</ul> 

CSS can be used to style the list elements, so this technique can be used with a variety of visual appearances.

Here is a style that removes the list bullets and the left padding that creates the indent and flows the individual list elements horizontally.

Example Code:

ul.navigation {
  list-style: none; 
  padding: 0;
}
ul.navigation li {
  display: inline;
}

This style removes the list bullets and the left padding and displays the items in a floating block.

Example Code:

 ul.navigation {
 list-style: none; 
 padding: 0;
}
ul.navigation li {
 display: block; 
 float: left;
}
[end delete]

Example 2: Using map to group links

In this example, the map element groups a set of links, the title attribute identifies it as a navigation bar.

Example Code:

 <map title="Navigation Bar">
  <p>
    [<a href="home.html">Home</a>] 
    [<a href="search.html">Search</a>] 
    [<a href="new.html">New and highlighted</a>] 
    [<a href="sitemap.html">Site map</a>]
  </p>
 </map>  

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

Examine the content for anchor elements which are to be grouped together .

  1. Check that the anchor elements are grouped using [begin delete]list or[end delete] map elements.

Expected Results

  • Check #1 is true.


H51: Using table markup to present tabular information

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to present tabular information in a way that preserves relationships within the information even when users cannot see the table or the presentation format is changed. Information is considered tabular when logical relationships among text, numbers, images, or other data exist in two dimensions (vertical and horizontal). These relationships are represented in columns and rows, and the columns and rows must be recognizable in order for the logical relationships to be perceived.

Using the table element with the child elements tr, th, and td makes these relationships perceivable. Techniques such as inserting tabs to create columns or using the pre element are purely visual, and visually implied logical relationships are lost if the user cannot see the table or the visual presentation is changed.

Examples

Example 1: A schedule marked up as a simple data table with column and row headers

This example uses markup for a simple data table. The first row shows the days of the week. Time intervals are shown in the first column. These cells are marked with the th element. This identifies the days of the week as column headers and the time intervals as row headers.

Screen readers speak header information that changes as the user navigates the table. Thus, when screen reader users move to left or right along a row, they will hear the day of the week (the column header) followed by the appointment (if any). They will hear the time interval as they move up or down within the same column.

Example Code:

 <table>
  <tr>
    <td> </td>
    <th>Monday</th>
    <th>Tuesday</th>
    <th>Wednesday</th>
    <th>Thursday</th>
    <th>Friday</th>
  </tr>
  <tr>
    <th>8:00-9:00</th>
    <td>Meet with Sam</td>
    <td> </td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <th>9:00-10:00</th>
    <td> </td>
    <td> </td>
    <td>Doctor Williams</td>
    <td>Sam again</td>
    <td>Leave for San Antonio</td>
  </tr>
</table> 

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check for the presence of tabular information.

  2. For each occurrence of tabular information:

    1. Check that table markup with at least the elements table, tr, th, and td is used.

Expected Results

  • All checks above are true.


H53: Using the body of the object element

Applicability

Documents that load media with the object element.

This technique relates to:

User Agent and Assistive Technology Support Notes

This technique is not supported well by assistive technologies and cross-browser support is irregular.

Description

The objective of this technique is to provide a text alternative for content rendered using the object element. The body of the object element can be used to provide a complete text alternative for the object or may contain additional non-text content with text alternatives.

Examples

Example 1: An object includes a long description that describes it

Example Code:

 <object classid="http://www.example.com/analogclock.py">
  <p>Here is some text that describes the object and its operation.</p>
</object>

Example 2: An object includes non-text content with a text alternative

Example Code:

<object classid="http://www.example.com/animatedlogo.py">
  <img src="staticlogo.gif" alt="Company Name" />
</object>   
            

Example 3: The image object has content that provides a brief description of the function of the image

Example Code:

<object data="companylogo.gif" type="image/gif">
  <p>Company Name</p>
</object>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check that the body of each object element contains a text alternative for the object.

Expected Results

  • #1 is true.


H54: Using the dfn element to identify the defining instance of a word

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to use the dfn to mark the use of a word or phrase where it is defined. The dfn element is used to indicate the defining instance of the enclosed term. In other words, it marks the occurrence of the term where the term is defined. Note that it encloses the term, not the definition. This technique would be used in combination with G112: Using inline definitions to provide the definition.

Examples

Example 1

The following code snippet demonstrates the use of the dfn element.

Example Code:

<p>The Web Content Accessibility Guidelines require that non-text content
has a text alternative. <dfn>Non-text content</dfn> is content that is not a sequence
of characters that can be programmatically determined or where the sequence is
not expressing something in human language; this includes ASCII Art (which is a
pattern of characters), emoticons, leetspeak (which is character substitution), and
images representing text .</p> 

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Identify all words that are defined inline in the text, that is, where the definition occurs in a sentence near an occurrence of the word.

  2. Check that each word that is defined inline is contained in a dfn element.

Expected Results

  • Check #2 is true.


H56: Using the dir attribute on an inline element to resolve problems with nested directional runs

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to identify changes in the text direction of text that includes nested directional runs by providing the dir attribute on inline elements. A nested directional run is a run of text that includes mixed directional text, for example, a paragraph in English containing a quoted Hebrew sentence which in turn includes an English phrase. Use of the dir attribute on an enclosing span or other inline element may be necessary because the Unicode bidirectional algorithm can produce undesirable results when mixed directional text contains spaces or punctuation. The concepts used in this technique are described in What you need to know about the bidi algorithm and inline markup.

Examples

Example 1

This example defines the text direction of a nested, mixed-direction phrase, in Hebrew and English, to be right-to-left. Because the whole quote is in Hebrew, and therefore runs right to left, the text "W3C" and the comma should appear to the left of (i.e., after) the Hebrew text, like this:

The title is "פעילות הבינאום, W3C" in Hebrew.

Visually-ordered ASCII version (RTL text in uppercase, LTR in lower):

the title is "w3c ,YTIVITCA NOITAZILANOITANRETNI" in hebrew.

The Unicode bidirection algorithm alone is insufficient to achieve the right result, and leaves the text 'W3C' on the right side of the quote:

The title is "פעילות הבינאום, W3C" in Hebrew.

Visually-ordered ASCII version:

the title is "YTIVITCA NOITAZILANOITANRETNI, w3c" in hebrew.

The following markup will produce the expected result:

Example Code:


<p>The title says "<span lang="he" 
dir="rtl">פעילות הבינאום, W3C</span>" in Hebrew.</p> 

Resources

Tests

Procedure

  1. Examine the text direction of text in the document

  2. If the text direction is right-to-left, check that for the ancestor element that has a dir attribute, the attribute has the value "rtl"

  3. If the text direction is left-to-right, check that there is no ancestor element with a dir attribute, or that for the ancestor element that has a dir attribute, the attribute has the value "ltr"

Expected Results

  • Checks #2 and #3 are true for all text.


H57: Using language attributes on the html element

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

Additional subtags for region, script, variant or other aspects may lead to errors in language switching in older versions of some screenreaders.

JAWS 8.0 can be configured to change language automatically on the basis of the lang attribute. However, it only switches amongst major languages as indicated by the primary code. If a regional language variant is indicated with a language subcode, JAWS will use the default variant for which it is configured.

Description

The objective of this technique is to identify the default language of a document by providing the lang and/or xml:lang attribute on the html element.

Identifying the language of the document is important for a number of reasons:

  • It allows braille translation software to substitute control codes for accented characters, and insert control codes necessary to prevent erroneous creation of Grade 2 braille contractions.

  • Speech synthesizers that support multiple languages will be able to orient and adapt to the pronunciation and syntax that are specific to the language of the page, speaking the text in the appropriate accent with proper pronunciation.

  • Marking the language can benefit future developments in technology, for example users who are unable to translate between languages themselves will be able to use machines to translate unfamiliar languages.

  • Marking the language can also assist user agents in providing definitions using a dictionary.

HTML 4.01 uses the lang attribute of the html element. XHTML served as text/html uses the lang attribute and the xml:lang attribute of the html element, in order to meet the requirements of XHTML and provide backward compatibility with HTML. XHTML served as application/xhtml+xml uses the xml:lang attribute of the html element. Both the lang and the xml:lang attributes can take only one value.

Note 1: HTML only offers the use of the lang attribute, while XHTML 1.0 (as a transitional measure) allows both attributes, and XHTML 1.1 allows only xml:lang.

Note 2: Allowed values for the lang and xml:lang attributes are indicated in the resources referenced below. Language tags use a primary code to indicate the language, and optional subcodes (separated by hyphen characters) to indicate variants of the language. For instance, English is indicated with the primary code "en"; British English and American English can be distinguished by using "en-GB" and "en-US", respectively. Use of the primary code is important for this technique. Use of subcodes is optional but may be helpful in certain circumstances.

Examples

Example 1

This example defines the content of an HTML document to be in the French language.

Example Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="fr"> 
<head>
  <title>document écrit en français</title>
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
</head>  
<body>     
	...document écrit en français...   
</body>
</html>

Example 2

This example defines the content of an XHTML 1.0 document with content type of text/html to be in the French language. Both the lang and xml:lang attributes are specified in order to meet the requirements of XHTML and provide backward compatibility with HTML.

Example Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr">
<head>
  <title>document écrit en français</title>
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
</head>
<body> 
...document écrit en français...      
</body>
</html>  

Example 3

This example defines the content of an XHTML 1.1 document with content type of application/xhtml+xml to be in the French language. Only the xml:lang attribute is specified.

Example Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" 
   "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr">
<head>
  <title>document écrit en français</title>
	<meta http-equiv="content-type" content="application/xhtml+xml; charset=utf-8" />
</head>
<body> 
	...document écrit en français... 
</body>
</html>

Resources

Tests

Procedure

  1. Examine the html element of the document.

  2. Check that the html element has a lang and/or xml:lang attribute.

  3. Check that the value of the lang attribute conforms to BCP 47: Tags for the Identification of Languages or its successor and reflects [begin change]the[end change] primary language used by the Web page.

Expected Results

  • The above checks are all true.


H58: Using language attributes to identify changes in the human language

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

Additional subtags for region, script, variant or other aspects may lead to errors in language switching in older versions of some screenreaders.

JAWS 8.0 can be configured to change language automatically on the basis of the lang attribute. However, it only switches amongst major languages as indicated by the primary code. If a regional language variant is indicated with a language subcode, JAWS will use the default variant for which it is configured.

Description

The objective of this technique is to clearly identify any changes in language on a page by using the lang or xml:lang attribute, as appropriate for the HTML or XHTML version you use.

HTML 4.01 uses the lang attribute on elements. XHTML served as text/html uses the lang attribute and the xml:lang attribute on elements, in order to meet the requirements of XHTML and provide backward compatibility with HTML. XHTML served as application/xhtml+xml uses the xml:lang attribute on elements.

Note: HTML only offers the use of the lang attribute, while XHTML 1.0 (as a transitional measure) allows both attributes, and XHTML 1.1 allows only xml:lang.

Allowed values for the lang and xml:lang attributes are indicated in the resources referenced below. Language tags use a primary code to indicate the language, and optional subcodes (separated by hyphen characters) to indicate variants of the language. For instance, English is indicated with the primary code "en"; British English and American English can be distinguished by using "en-GB" and "en-US", respectively. Use of the primary code is important for this technique. Use of subcodes is optional but may be helpful in certain circumstances.

Examples

Example 1

This example demonstrates the use of the xml:lang attribute defining a quote written in German. This snippet could be included by an XHTML 1.1 document where lang is not allowed.

Example Code:

<blockquote xml:lang="de">
  <p>
    Da dachte der Herr daran, ihn aus dem Futter zu schaffen,
    aber der Esel merkte, daß kein guter Wind wehte, lief fort
    und machte sich auf den Weg nach Bremen: dort, meinte er,
    könnte er ja Stadtmusikant werden.
  </p>
</blockquote>   
            

Resources

Tests

Procedure

For each element in the document:

  1. Check that the human language of the content of the element is the same as the inherited language for the element as specified in HTML 4.01, Inheritance of language codes

For each lang attribute in the document:

  1. Check that the value of the lang attribute conforms to BCP 47: Tags for the Identification of Languages or its successor

For each xml:lang attribute in the document:

  1. Check that the value of the xml:lang attribute conforms to BCP 47: Tags for the Identification of Languages or its successor

Expected Results

  • All checks above are true.


H59: Using the link element and navigation tools

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

  • The link element has inconsistent user agent and assistive technology support.

  • Some user agents provide an optional navigation bar which will display the information specified in the link element. Current versions of the Mozilla and Opera browsers provide this functionality. IE 6.0 and Firefox 1.5 do not offer this feature but it may be available through extensions or add-ons.

    See The 'link'-Element in (X)HTML for more information on browser support for link.

Description

The objective of this technique is to describe how the link element can provide metadata about the position of an HTML page within a set of Web pages or can assist in locating content with a set of Web pages. The value of the rel attributes indicates what type of relation is being described, and the href attribute provides a link to the document having that relation. Multiple link elements can provide multiple relationships. Several values of rel are useful:

  • Start: Refers to the first document in a collection of documents.

  • Next: Refers to the next document in a linear sequence of documents.

  • Prev: Refers to the previous document in an ordered series of documents.

  • Contents: Refers to a document serving as a table of contents.

  • Index: Refers to a document providing an index for the current document.

Examples

Example 1

A Web page for Chapter 2 of an on-line book might contain the following links within the head section.

Example Code:

<link rel="Contents" href="Contents.html" title="Table of Contents"  />
<link rel="Index" href="Index.html" title="Index" />
<link rel="Prev" href="Chapter01.html" title="01. Why Volunteer?" />
<link rel="Next" href="Chapter03.html" title="03. Who Volunteers?" />

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For a Web page that is within a sequence or collection of Web pages:

  1. Check that all link elements pertaining to navigation occur in the head section of the document.

  2. For each link element in the head section of the document which pertains to navigation, check that it contains at least:

    1. a rel attribute identifying the link type

    2. a valid href attribute to locate the appropriate resource

Expected Results

  • All of the checks above are true.


H60: Using the link element to link to a glossary

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

Some user agents provide an optional navigation bar which will display the information specified in the link element. Current versions of the Mozilla and Opera browsers provide this functionality. IE 6.0 and Firefox 1.5 do not offer this feature but it may be available through extensions or add-ons. See The 'link'-Element in (X)HTML for more information on browser support for the link element.

Description

The objective of this technique is to provide a mechanism for locating a glossary. When terms in the content are defined on a separate glossary page, the glossary is referenced using a link element in the head element of the document that uses the glossary. The rel attribute of the link element is set to "glossary", and the href attribute contains the URI of the glossary page. User agents can then assist users in accessing the glossary quickly and easily.

Examples

Example 1: The WCAG 2.0 Glossary.

Example Code:

 <link rel="glossary" href="http://www.w3.org/TR/WCAG20/#glossary">

Resources

Resources are for information purposes only, no endorsement implied.

(none currently listed)

Tests

Procedure

For any set of words and their definitions that are meant to serve as a glossary:

  1. Check that the head section of the Web page that contains words, phrases or abbreviations defined in a glossary contains a link element

  2. Check that the link element has attribute rel="glossary"

  3. Check that the href attribute of the link element refers to the glossary page.

Expected Results

  • All checks above are true.

Note: The definition of abbreviation used in WCAG is : "shortened form of a word, phrase, or name where the original expansion has not been rejected by the organization that it refers to and where the abbreviation has not become part of the language."


H62: Using the ruby element

Applicability

XHTML 1.1

This technique relates to:

User Agent and Assistive Technology Support Notes

Ruby markup includes the rp element as a fallback mechanism for user agents that do not support XHTML 1.1. Although ruby markup is only defined in XHTML 1.1, IE 5.0 and later supports the ruby, rt, and rp elements even if they are used in HTML 4.01 or XHTML 1.0.

Description

The objective of this technique is to use ruby annotation to provide information about the pronunciation and meaning of a run of text where meaning is determined by pronunciation.

There are many languages in which a run of text may mean different things depending on how the text is pronounced. This is common in East Asian languages as well as Hebrew, Arabic, and other languages; it also occurs in English and other Western European languages.

Ruby Annotation allows the author to annotate a "base text," providing a guide to pronunciation and, in some cases, a definition as well. Ruby is commonly used for text in Japanese and other East Asian languages. Ruby Annotation is defined as a module for XHTML 1.1.

There are two types of Ruby markup: simple and complex. Simple Ruby markup applies to a run of text such as a complete word or phrase. This is known as the "base" text (rb element). The Ruby annotation that indicates how to pronounce the term (the rt element, or Ruby text) is shown in a smaller font. (The term "Ruby" is derived from a small font used for this purpose in printed texts.) The Ruby text is usually rendered above or immediately before the base text, that is, immediately above horizontal text or immediately to the right of vertical text. Sometimes Japanese uses Ruby to provide the meaning of text on the other side of the base text (visually) from the phonetic annotation. Simple Ruby markup also provides a "fallback" option for user agents that do not support Ruby markup (that is, user agents that do not support XHTML 1.1).

Complex Ruby markup makes it possible to divide the base text into smaller units, each of which may be associated with a separate Ruby annotation. Complex Ruby markup does not support the fallback option.

Ruby annotation is uncommon in languages such as Hebrew, where Unicode fonts can include diacritical marks that convey pronunciation. It is also uncommon in English and European languages.

Note: The primary reason for indicating pronunciation through Ruby or any other means is to make the content accessible to people with disabilities who could read and understand the language of the content if information about pronunciation were provided. It is not necessary to provide information about pronunciation for use by people who are not familiar with the language of the content.

Examples

Example 1: Ruby markup providing pronunciation information for an initialism

This example uses Ruby annotation to give the pronunciation of the initialism (acronym) formed by the first letters of the words Web Content Accessibility Guidelines. The letters WCAG are the base (the rb element), and the pronunciation information is shown by the Ruby text (the rt element). The Ruby parenthesis element rp is used for user agents that do not support Ruby annotations to indicate that the text in the rt element provides the pronunciation information. The pronunciation information is rendered in parentheses immediately following the base text. (User agents that support Ruby do not show the parentheses.)

Example Code:

<p>When we talk about these guidelines, we often just call them
  <ruby>
    <rb>WCAG</rb>
    <rp>(</rp>
      <rt>Wuh-KAG</rt>
    <rp>)</rp>
  </ruby>.
</p>

Example 2: Ruby annotation for Japanese

The following is an example in Japanese. For Japanese, the Ruby is used to give the reading of Han characters(Kanji). the Ruby parenthesis element rp is used for user agents that do not support Ruby annotations to indicate that the text in the rt element provides the pronunciation information. The pronunciation information is rendered in parentheses immediately following the base text. (User agents that support Ruby do not show the parentheses.)

Example Code:

<p>
  <ruby>
    <rb>慶應大学</rb>
    <rp>(</rp>
    <rt>けいおうだいがく</rt>
    <rp>)</rp>
  </ruby>
</p>    

Resources

Tests

Procedure

For each run of text where a Ruby annotation is used to provide pronunciation information:

  1. Check that a rt element contains pronunciation information for each run of text defined by the rb element.

  2. If simple Ruby markup is used, check that the rp element is present to indicate to user agents that do not support Ruby annotations that the text in the rt element provides the pronunciation information. .

Expected Results

  • Checks #1 and #2 are true.


H63: Using the scope attribute to associate header cells and data cells in data tables

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

The row and col values of the scope attribute are currently supported to a large extent by most current versions of JAWS. However, there are still some problems and WindowEyes support for scope is inconsistent. The same is true for Japanese versions of these screen readers. Versions of JAWS prior to version 5 and older versions of WindowsEyes have inconsistent support for scope.

At the current time, those who want to ensure consistent support across Assistive Technologies for tables where the headers are not in the first row/column may want to use the technique for complex tables H43: Using id and headers attributes to associate data cells with header cells in data tables. For simple tables that have headers in the first column or row we recommend the use of the th and td elements.

Description

The objective of this technique is to associate header cells with data cells using the scope attribute. The scope attribute may be used to clarify the scope of any cell used as a header. The scope identifies whether the cell is a header for a row, column, or group of rows or columns. The values row, col, rowgroup, and colgroup identify these possible scopes respectively.

For simple data tables where the header is not in the first row or column, like the one in Example 1, this technique can be used. Based on screen reader support today, its use is suggested in two situations both relating to simple tables: :

  • data cells marked up with td that also function as row header or column header

  • header cells marked up with td instead of th. Sometimes, authors use this to avoid the display characteristics associated with th and also do not choose to use CSS to control the display for th.

Note: For simple tables that have the headers in the first row or column then it is sufficient to simply use the TH elements without scope.

Examples

Example 1: A simple schedule

In the following example, column #1 contains serial numbers for rows in the table and the second column contains the key value for the row. The cells in the second column may then use scope="row". The cells in the first row too are marked up with td and use scope="col".

[begin change]

Example Code:

 <table border="1">
  <caption>Contact Information</caption>
  <tr>
    <td></td>
    <th scope="col">Name</th>
    <th scope="col">Phone#</th>
    <th scope="col">Fax#</th>
    <th scope="col">City</th>
  </tr><tr>
    <td>1.</td>
    <th scope="row">Joel Garner</th>
    <td>412-212-5421</td>
    <td>412-212-5400</td>
    <td>Pittsburgh</td>
  </tr><tr>
    <td>2.</td>
    <th scope="row">Clive Lloyd</th>
    <td>410-306-1420</td>
    <td>410-306-5400</td>
    <td>Baltimore</td>
  </tr><tr>
    <td>3.</td>
    <th scope="row">Gordon Greenidge</th>
    <td>281-564-6720</td>
    <td>281-511-6600</td>
    <td>Houston</td>
  </tr>
</table> 
[end change]

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For each data table:

  1. Check that all th elements have a scope attribute.

  2. Check that all td elements that act as headers for other elements have a scope attribute.

  3. Check that all scope attributes have the value row, col, rowgroup, or colgroup.

Expected Results

  • All checks above are true.


H64: Using the title attribute of the frame and iframe elements

Applicability

HTML and XHTML documents that use frames or iframes

This technique relates to:

User Agent and Assistive Technology Support Notes

The use of the longdesc attribute on frame and iframe elements is not supported well by assistive technologies.

Description

The objective of this technique is to demonstrate the use of the title attribute of the frame or iframe element to describe the contents of each frame. This provides a label for the frame so users can determine which frame to enter and explore in detail. It does not label the individual page (frame) or inline frame (iframe) in the frameset.

Note that the title attribute labels frames, and is different from the title element which labels documents. Both should be provided, since the first facilitates navigation among frames and the second clarifies the user's current location.

The title attribute is not interchangeable with the name attribute. The title labels the frame for users; the name labels it for scripting and window targeting. The name is not presented to the user, only the title is.

Examples

Example 1

This example shows how to use the title attribute with frame to describe the frames containing the navigation bar and the document.

Example Code:

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>A simple frameset document</title>
  </head>
  <frameset cols="10%, 90%">
    <frame src="nav.html" title="Main menu" />
    <frame src="doc.html" title="Documents" />
    <noframes>
      <body>
        <a href="lib.html" title="Library link">Select to
        go to the electronic library</a>
      </body>
    </noframes>
  </frameset>
</html> 

Example 2

This example shows how to use the title attribute with iframe to describe the contents of an inline frame. The example also includes an alternative link to the page included by the iframe element for older browsers, which may not understand the iframeelement.

Example Code:

 <html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>A document using iframe</title>
  </head>
...
<iframe src="banner-ad.html" id="testiframe" 
  name="testiframe" title="Advertisement">
    <a href="banner-ad.html">Advertisement</a>
</iframe>
...
</html>  

Resources

Tests

Procedure

  1. Check each frame and iframe element in the HTML or XHTML source code for the presence of a title attribute.

  2. Check that the title attribute contains text that identifies the frame.

Expected Results

  • Checks #1 and #2 are true.


H65: Using the title attribute to identify form controls when the label element cannot be used

Applicability

HTML and XHTML form controls that are not identified using value, alt, or element content

This technique relates to:

User Agent and Assistive Technology Support Notes

  • User agents will display a tool tip when the mouse hovers above an input element containing a title attribute.

  • If no label is available, JAWS and Window-Eyes speak the title attribute when the form control receives focus

    • JAWS 6.0 and later can be set to speak both label and title when the two items are different; however, very few users are aware of this setting.

    • WindowEyes 5.5 has a hot key, ins-E, that will display additional information, including the title attribute, for the item with focus.

Description

The objective of this technique is to use the title attribute to label form controls when the visual design cannot accommodate the label (for example, if there is no text on the screen that can be identified as a label) or where it might be confusing to display a label. User agents, including assistive technology, can speak the title attribute.

Examples

Example 1: A pulldown menu that limits the scope of a search

A search form uses a pulldown menu to limit the scope of the search. The pulldown menu is immediately adjacent to the text field used to enter the search term. The relationship between the search field and the pulldown menu is clear to users who can see the visual design, which does not have room for a visible label. The title attribute is used to identify the select menu. The title attribute can be spoken by screen readers or displayed as a tool tip for people using screen magnifiers.

Example Code:

<label for="searchTerm">Search for:</label>
<input id="searchTerm" type="text" size="30" value="" name="searchTerm">
<select title="Search in" id="scope">
…
</select> 

Example 2: Input fields for a phone number

A Web page contains controls for entering a phone number in the United States, with three fields for area code, exchange, and last four digits.

Example Code:

<fieldset><legend>Phone number</legend>
<input id="areaCode" name="areaCode" title="Area Code" 
type="text" size="3" value="" >
<input id="exchange" name="exchange" title="First three digits of phone number" 
type="text" size="3" value="" >
<input id="lastDigits" name="lastDigits" title="Last four digits of phone number" 
type="text" size="4" value="" >
</fieldset> 

Example 3: A Search Function

A Web page contains a text field where the user can enter search terms and a button labeled "Search" for performing the search. The title attribute is used to identify the form control and the button is positioned right after the text field so that it is clear to the user that the text field is where the search term should be entered.

Example Code:


<input type="text" title="Type search term here" value="Type search term here"/> <input type="submit" value="Search"/>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Identify each form control that is not associated with a label element

  2. Check that the control has a title attribute

  3. Check that the title attribute identifies the purpose of the control

Expected Results

  • All checks above are true.


H67: Using null alt text and no title attribute on img elements for images that AT should ignore

Applicability

HTML and XHTML documents that load images.

This technique relates to:

Description

The purpose of this technique is to show how images can be marked so that they can be ignored by Assistive Technology.

If no title attribute is used, and the alt text is set to null (i.e. alt="") it indicates to assistive technology that the image can be safely ignored.

Note: Although alt=" " is also valid, alt="" is recommended.

Note: Have a "null" alt attribute is not the same as having no alt attribute.

Examples

Example 1

The following image is used to insert a decorative image on a Web page.

Example Code:


<img src="squiggle.gif" width="20" height="20" alt="" />

Resources

Resources are for information purposes only, no endorsement implied.

(none currently listed)

Tests

Procedure

For each image that should be ignored.

  1. Check that title attribute is either absent or empty.

  2. Check that alt attribute is present and empty or contains only whitespace (but not &nbsp;)

Expected Results

  • #1 and #2 are true


H69: Providing heading elements at the beginning of each section of content

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

JAWS and WindowEyes all provide navigation via headings and provide information about the level of the heading. The Opera browser provides a mechanism to navigate by headings. Additional plugins support navigation by headings in other user agents.

Description

The objective of this technique is to use section headings to convey the structure of the content. Heading markup can be used:

  • to indicate start of main content

  • to mark up section headings within the main content area

  • to demarcate different navigational sections like top or main navigation, left or secondary navigation and footer navigation

  • to markup images (containing text) which have the appearance of headings visually.

In some technologies, headings are designed to convey logical hierarchy. Skipping levels in the sequence of headings may create the impression that the structure of the document has not been properly thought through or that specific headings have been chosen for their visual rendering rather than their meaning. Authors are encouraged to nest headings hierarchically.

Since headings indicate the start of important sections of content, it is possible for users with assistive technology to jump directly to the appropriate heading and begin reading the content. This significantly speeds interaction for users who would otherwise access the content slowly.

In technologies that support Cascading Style Sheets (CSS), styling can be used to change the way headings look or sound. It is even possible to style headings using CSS so that they are exposed to assistive technology but are hidden from view visually. However, showing the headings visually benefits a wider set of users, including those with some cognitive disabilities.

Examples

Example 1

This example organizes the sections of a search page by marking each section heading using h2 elements.

Example Code:

<h1>Search Technical Periodicals</h1>
 <h2>Search</h2>
 <form action="search.php">
  <p><label for="searchInput">Enter search topic: </label>
  <input type="text" size="30" id="searchInput">
  <input type="submit" value="Go"></p>
 </form>
 <h2>Available Periodicals</h2>
 <div class="jlinks">
  <a href="pcoder.com">Professional Coder</a> |
  <a href="algo.com">Algorithms</a> |
  <a href="jse.com">Journal of Software Engineering</a>
 </div>
 <h2>Search Results</h2>
 ... search results are returned in this section ...   

Example 2: Headings show the overall organization of the content

In this example, heading markup is used to make the navigation and main content sections perceivable.

Example Code:

<!-- Logo, banner graphic, search form, etc.  -->
  <h2>Navigation</h2>
    <ul>
      <li><a href="about.htm">About us</a></li>
      <li><a href="contact.htm">Contact us</a></li>
       ...
    </ul>
  <h2>All about headings</h2>
   <!-- Text, images, other material making up the main content... --> 
            

Example 3: Headings show the organization of material within the main content

[begin change]

Note that in HTML 4.01 and XHTML 1.x, heading elements only mark the beginning of sections. Because there is no markup to associate a heading element with the section content explicitly, users will assume that the heading applies to all following content until the next heading element is encountered.

[end change]

Example Code:

 <html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>Cooking techniques</title>  
  </head>   
  <body>     
    <h1>Cooking techniques</h1>     
    <p>       
      ... some text here ...     
    </p>           
    <h2>Cooking with oil</h2> 
    <p> 
        ... text of the section ...     
    </p>           
    <h2>Cooking with butter</h2>       
    <p>
        ... text of the section ...     
    </p>   
  </body> 
</html>    

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For all content which is divided into separate sections,

  1. Check that each section starts with a heading.

Expected Results

  • Check #1 is true.


H70: Using frame elements to group blocks of repeated material

Applicability

HTML and XHTML documents that use frames

This technique relates to:

Description

The objective of this technique is to demonstrate how framesets can be used to group blocks of repeated material. Since most user agents and assistive technology provide a way to navigate from frame to frame, using frames to organize elements can provide a mechanism for easily bypassing blocks of repeated content. If the site uses framesets, organize the blocks of content into separate frames. Make certain that the repeated blocks of content appear in the same frame within the frameset of each Web page. In addition, each frame element must have a title attribute to describe the content of the frame. When frames are properly titled, users can use frame navigation to easily navigate between blocks of content.

This technique is appropriate when framesets are already used to organize the content of the page; other techniques are preferred for pages that are not already using framesets, because many people using assistive technology have trouble with frames . An advisory technique about using noframes is available in Success Criterion 4.2.1.

Examples

Example 1

The following example shows the use of two frames to organize content. The source of the first frame is the Web page, navigation.html, which contains the HTML for the navigation. This frame has a title attribute which identifies it as a navigation bar. The second frame contains the main content of the site as indicated by the source parameter of main.html and the title attribute, "Main News Content" which identifies its function.

Example Code:

<frameset cols="20%, *">
  <frame src="navigation.html" name="navbar" title="Navigation Bar" />
  <frame src="main.html" name="maincontent" title="Main News Content" />
  <noframes>
    <p>View <a href="noframe.html">no frame version</a>.</p>
  </noframes>
</frameset>   

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

If the Web page uses frames to organize content:

  1. Check if repeated blocks of content are organized into separate frames.

  2. Check that the frames with repeated content appear in the same location within each frameset.

Expected Results

  • Checks #1 and #2 are true.


H71: Providing a description for groups of form controls using fieldset and legend elements

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to provide a semantic grouping for related form controls. This allows users to understand the relationship of the controls and interact with the form more quickly and effectively.

Form controls can be grouped by enclosing them with the fieldset element. All controls within a given fieldset are then related. The first element inside the fieldset should be a legend element, which provides a label or instructions for the group. Fieldsets can be nested if desired, although this can lead to confusion if overdone.

Grouping controls is most important for related radio buttons and checkboxes. A set of radio buttons or checkboxes is related when they all submit values for a single named field. They work in the same way as selection lists, allowing the user to choose from a set of options, except selection lists are single controls while radio buttons and checkboxes are multiple controls. Because they are multiple controls, it is particularly important that they be grouped semantically so they can be more easily treated as a single control. Often, user agents will present the value of the legend before the label of each control, to remind users that they are part of the same group.

It can also be useful to group other sets of controls that are not as tightly related as sets of radio buttons and checkboxes. For instance, several fields that collect a user's address might be grouped together with a legend of "Address".

Authors sometimes avoid using the fieldset element because of the default display in the browser, which draws a border around the grouped controls. This visual grouping is also useful and authors should seriously consider retaining it (or some form of visual grouping). The visual effect can be modified in CSS by overriding the "border" property of the fieldset and the "position" property of the legend.

When a small group of related radio buttons includes clear instructions and distinct selections it may not be necessary to use fieldsets and legends; H44: Using label elements to associate text labels with form controls, may also be sufficient.

Examples

Example 1: A multiple choice test

This example shows a test item with one question and five possible answers. Each answer is represented by a radio button (input type="radio"). The radio buttons are contained within a fieldset. The test question is tagged with the legend element.

Example Code:

<fieldset>
  <legend>The play <cite>Hamlet</cite> was written by:</legend>
  <input type="radio" id="shakesp" name="hamlet" checked="checked" value="a">
  <label for="shakesp">William Shakespeare</label><br />
  <input type="radio" id="kipling" name="hamlet" value="b">
  <label for="kipling">Rudyard Kipling</label><br />
  <input type="radio" id="gbshaw" name="hamlet" value="c">
  <label for="gbshaw">George Bernard Shaw</label><br />
  <input type="radio" id="hem" name="hamlet" value="d">
  <label for="hem">Ernest Hemingway</label><br />
  <input type="radio" id="dickens" name="hamlet" value="e">
  <label for="dickens">Charles Dickens</label>
</fieldset>   

Example 2: A set of checkboxes

The User Profile page for a Web site allows users to indicate their interests by selecting multiple checkboxes. Each checkbox (input type="checkbox") has a label. The checkboxes are contained within a fieldset, and the legend element contains the prompt for the entire group of checkboxes.

Example Code:

<fieldset>
  <legend>I am interested in the following (check all that apply):</legend>
  <input type="checkbox" id="photo" name="interests" value="ph">
  <label for="photo">Photography</label><br />
  <input type="checkbox" id="watercol" name="interests" checked="checked" value="wa">
  <label for="watercol">Watercolor</label><br />
  <input type="checkbox" id="acrylic" name="interests" checked="checked" value="ac">
  <label for="acrylic">Acrylic</label>
  …
</fieldset>    

Example 3: Radio buttons submitting to the same named field

This example requests the user to choose a single philosopher. Note that each field has the same "name" attribute, indicating these radio buttons are related (they all submit the same field), and should be grouped as shown. Also note that while the "name" attributes are the same, the "id" attributes must be unique.

Example Code:

<form action="http://example.com/vote" method="post">
  <fieldset>
    <legend>Your preferred philosopher</legend>
    <input type="radio" name="philosopher" id="philosopher_socrates" value="socrates"/>
    <label for="philosopher_socrates">Socrates</label>
    <input type="radio" name="philosopher" id="philosopher_plato" value="plato"/>
    <label for="philosopher_plato">Plato</label>
    <input type="radio" name="philosopher" id="philosopher_aristotle" value="aristotle"/>
    <label for="philosopher_aristotle">Aristotle</label>
  </fieldset>
  </form> 

Note: Groups of related checkboxes work in the same way, except the user is allowed to express more than one preference for the field.

Example 4: Logically related controls

In this example, form fields for residential and postal addresses are distinguished by the value of the legend in each fieldset grouping.

Example Code:

<form action="http://example.com/adduser" method="post">
   <fieldset>
     <legend>Residential Address</legend>
     <label for="raddress">Address: </label>
     <input type="text" id="raddress" name="raddress" />
     <label for="rzip">Postal/Zip Code: </label>
     <input type="text" id="rzip" name="rzip" />
     ...more residential address information...
   </fieldset>
   <fieldset>
     <legend>Postal Address</legend>
     <label for="paddress">Address: </label>
     <input type="text" id="paddress" name="paddress" />
     <label for="pzip">Postal/Zip Code: </label>
     <input type="text" id="pzip" name="pzip" />
     ...more postal address information...
   </fieldset>
</form>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check that groups of logically related input elements are contained within a fieldset element.

  2. Check that any group of input elements of type="radio" or type="checkbox" with the same name attribute is contained within a fieldset element

  3. Check that each fieldset has a legend element that includes a description of that group.

Expected Results

  • All of the above checks are true.


H73: Using the summary attribute of the table element to give an overview of data tables

Applicability

HTML 4.01, XHTML 1.x

This technique relates to:

Description

The objective of this technique is to provide a brief overview of how data has been organized into a table or a brief explanation of how to navigate the table. The summary attribute of the table element makes this information available to people who use screen readers; the information is not displayed visually.

The summary is useful when the table has a complex structure (for example, when there are several sets of row or column headers, or when there are multiple groups of columns or rows). The summary may also be helpful for simple data tables that contain many columns or rows of data.

The summary attribute may be used whether or not the table includes a caption element. If both are used, the summary should not duplicate the caption.

Although WCAG 2 does not prohibit the use of layout tables, CSS-based layouts are recommended in order to retain the defined semantic meaning of the HTML table elements and to conform to the coding practice of separating presentation from content. However, if a layout table is used, then the summary attribute is not used or is null. The purpose of a layout table is simply to control the placement of content; the table itself is “transparent" to the user. A summary would “break" this transparency by calling attention to the table. A null summary (summary="") on layout tables is acceptable.

Examples

Example 1: A data table with a summary but no caption

This example shows a bus schedule. The route number and direction are included in the summary along with information on how to use the schedule.

Example Code:

<table summary="Schedule for Route 7 going downtown. Service begins 
at 4:00 AM and ends at midnight. Intersections are listed in the top row. 
Find the intersection closest to your starting point or destination, then read 
down that column to find out what time the bus leaves that intersection.">
  <tr>
    <th scope="col">State & First</th>
    <th scope="col">State & Sixth</th>
    <th scope="col">State & Fifteenth</th>
    <th scope="col">Fifteenth & Morrison</th>
  </tr>
    <td>4:00</td>
    <td>4:05</td>
    <td>4:11</td>
    <td>4:19</td>
  </tr>
  …
</table>  

Example 2: A data table with both a summary and a caption

In this example both a summary attribute and a caption element are used. The caption identifies the bus route. The summary helps users who are blind understand how to use the schedule. Screen readers read the caption, followed by the summary.

Example Code:

<table summary="Intersections are listed in row 1. 
Find the intersection closest to your starting point 
or destination, then read down that column to find 
out what time the bus leaves that intersection.  
Service begins at 4:00 AM and ends at midnight.">
  <caption>Route 7 Downtown (Weekdays)</caption>
…
</table>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check for layout tables: determine whether the content has a relationship with other content in both its column and its row.

    1. If “no," the table is a layout table.

    2. If “yes," the table is a data table.

  2. If the table is a layout table, check that the summary attribute is not present or summary attribute is null.

  3. If the table is a data table and a summary is present, check that the summary attribute describes the table's organization or explains how to use the table

  4. If both a summary attribute and a caption element are present for this data table, check that the summary does not duplicate the caption.

Expected Results

  • For layout tables, #2 is true.

  • For data tables, #3 and #4 are true.


H74: Ensuring that opening and closing tags are used according to specification

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to avoid key errors that are known to cause problems for assistive technologies when they are trying to parse content which involve having opening and closing tags that are not used according to specification. These errors can be avoided by using the HTML or XHTML mechanism to specify the technology and technology version, and making sure the Web page does not have these types of errors in it. There are several validators that the developer can use: validation reports generally mention these types of errors. This technique deals only with errors related to incorrectly formed opening and closing tags. The document type declaration is not strictly necessary for this type of evaluation, but specifying the document type declaration makes it easier to use a validator.

Examples

Example 1: HTML

HTML pages include a document type declaration (sometimes referred to as !DOCTYPE statement). The developer can use offline or online validators (see Resources below) to check that all id attribute values are unique and that opening and closing tags are used according to the specification.

Example 2: XHTML

Like other other XML-based documents, XHTML documents reference a Document Type Definition (DTD) or other type of XML schema. The developer can use online or offline validators (including validation tools built into editors) to check that opening and closing tags are used according to the specification.

Example 3: Using test frameworks

When a Website generates HTML or XHTML dynamically instead of serving only static pages, a developer can use XHTMLUnit, XML Test Suite or a similar framework to test the generated XHTML code.

Resources

Resources are for information purposes only, no endorsement implied.

For other resources, see G134: Validating Web pages.

(none currently listed)

Tests

Procedure

  1. Check that there are closing tags for all elements with required closing tags.

  2. Check that there are no closing tags for all elements where closing tags are forbidden.

  3. Check that opening and closing tags for all elements are correctly nested.

Expected Results

Steps 1, 2, and 3 are true.


H75: Ensuring that Web pages are well-formed

Applicability

Any XML-based markup languages.

This technique relates to:

Description

The objective of this technique is to avoid key errors that are known to cause problems for assistive technologies when they are trying to parse contents. Well-formedness is checked by parsing the document with a conforming XML parserand checking if the validation report mentions well-formedness errors. Every conforming XML parser is required to check well-formedness and stop normal processing when a well-formedness error is found (a conforming XML parser does not need to support validation).

Examples

Example 1:

XML files include a document type declaration, a xsi:schemaLocation attribute or other type of reference to a schema. The developer can use off-line or online validators, an XML editor or an IDE with XML support (see Resources below) to check well-formedness.

Example 2:

When XML files do not include a document type declaration, a xsi:schemaLocation attribute or a processing instruction referencing a schema even though there is a schema for them, the relevant schema is specified by a command line instruction, a user dialog or a configuration file, and the XML files are checked against the schema.

Example 3:

When XML files do not include a document type declaration, a xsi:schemaLocation attribute or a processing instruction referencing a schema even though there is a schema for them, the namespace is dereferenced to retrieve a schema document or resource directory (Resource Directory Description Language: RDDL), and the XML files are checked against the schema.

Example 4:

When a Website generates XML dynamically instead of serving only static documents, a developer can use XMLUnit, XML Test Suite or a similar framework to test the generated XML code.

Resources

Resources are for information purposes only, no endorsement implied.

For other resources, see G134: Validating Web pages.

(none currently listed)

Tests

Procedure

  1. Load each file into a validating XML parser.

  2. Check that there are no well-formedness errors.

Expected Results

Step 2 is true.


H76: Using meta refresh to create an instant client-side redirect

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to enable redirects on the client side without confusing the user. Redirects are preferably implemented on the server side (see SVR1: Implementing automatic redirects on the server side instead of on the client side (SERVER) ), but authors do not always have control over server-side technologies.

In HTML and XHTML, one can use the meta element with the value of the http-equiv attribute set to "Refresh" and the value of the content attribute set to "0" (meaning zero seconds), followed by the URI that the browser should request. It is important that the time-out is set to zero, to avoid that content is displayed before the new page is loaded. The page containing the redirect code should only contain information related to the redirect.

Examples

Example 1

Example Code:

 <html xmlns="http://www.w3.org/1999/xhtml">    
  <head>      
    <title>The Tudors</title>      
    <meta http-equiv="refresh" content="0;URL='http://thetudors.example.com/'" />    
  </head>    
  <body> 
    <p>This page has moved to a <a href="http://thetudors.example.com/">
      theTudors.example.com</a>.</p> 
  </body>  
</html>     

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Find all meta elements in the document.

  2. For each meta element, check if it contains the attribute http-equiv with value "refresh" (case-insensitive) and the content attribute with a number greater than 0 followed by ;'URL=anyURL' (where anyURL stands for the URI that should replace the current page).

Expected Results

Step 2 is false.


H77: Identifying the purpose of a link using link text combined with its enclosing list item

Applicability

All technologies that contain links.

This technique relates to:

Description

The objective of this technique is to identify the purpose of a link from the link and its list item context. The list item enclosing the link provides context for an otherwise unclear link when the link item is the nearest enclosing block-level ancestor element. The description lets a user distinguish this link from links in the Web page that lead to other destinations and helps the user determine whether to follow the link. Note that simply providing the URI of the destination is generally not sufficiently descriptive.

Note: These descriptions will be most useful to the user if the additional information needed to understand the link precedes the link. If the additional information follows the link, there can be confusion and difficulty for screen reader users who are reading through the page in order (top to bottom).

Examples

Example 1

Example Code:

<ul>
  <li>
    Check out the video report for last year's 
    <a href="festival.htm">National Folk Festival</a>.
  </li>
  <li>
    <a href="listen.htm">Listen to the instruments</a>
  </li>
  <li>
    Guitar Man: George Golden talks about 
    <a href="mkguitars.htm">making guitars</a>.
  </li>
</ul>

Example 2: A list of video games for download

Example Code:

<ul>
  <li>
    <a href="tomb_raider.htm">Tomb Raider: Legend</a>
    <a href="tomb_raider_images.htm">See Images</a>
    <a href="tomb_raider.mpeg">(Download Demo)</a>
  </li>
  <li>
    <a href="fear_extraction.htm">F.E.A.R. Extraction Point</a>
    <a href="fear_extraction_images.htm">See Images</a>
    <a href="fear_extraction.mpeg">(Download Demo)</a>
  </li>
  <li>
    <a href="call_of_duty.htm">Call of Duty 2</a>
    <a href="call_of_duty_images.htm">See Images</a>
    <a href="call_of_duty.mpeg">(Download Demo)</a>
  </li>
  <li>
    <a href="Warhammer 40K.htm">Warhammer 40K</a>
    <a href="warhammer_40k_images.htm">See Images</a>
    <a href="Warhammer_40k.mpeg">(Download Demo)</a>
  </li>
</ul>   

Resources

No resources available for this technique.

Tests

Procedure

For each link in the content that uses this technique:

  1. Check that the link is part of a list item.

  2. Check that text of the link combined with the text of its enclosing list item describes the purpose of the link.

Expected Results

  • The above checks are true.


H78: Identifying the purpose of a link using link text combined with its enclosing paragraph

Applicability

All technologies that contain links.

This technique relates to:

User Agent and Assistive Technology Support Notes

JAWS 5.0 and later includes the following keystrokes:

  • alt+leftArrow: read previous sentence

  • alt+rightArrow: read next sentence

  • alt+NumPad 5: read current sentence

  • Ctrl+NumPad5: read current paragraph

The "read current sentence" keystroke supports examples 1, 2, and 4 below. If alt+numPad5 is pressed when a link has focus, the sentence is read without changing the focus.

The "read current paragraph" keystroke supports Example 3 below. If Ctrl+NumPad 5 is pressed when the link has focus, the entire paragraph is read without changing the focus.

Window-Eyes 5.5 has hotkeys to read the current sentence and current paragraph; thus Window-Eyes 5.5 supports the examples listed below.

To surf the internet with WindowEyes you must be in browse mode. Current sentence and current paragraph hot keys do not work in browse mode in version 6.1.

The factory default settings for reading surrounding link context are as follows:

Desktop settings:

  • Character = CTRL-NUMPAD-LEFT ARROW

  • Word = CTRL-NUMPAD-RIGHT ARROW

  • Line = CTRL-NUMPAD-CENTER

  • Sentence = Not available in Browse mode

  • (Next Sentence command is undefined by default on Desktop mode but the next line is the DOWN Arrow.)

  • Next Paragraph = P

  • Prior Paragraph = Shift P

  • Current Paragraph = Not Available in Browse mode

Laptop

  • Character = ALT-SHIFT-LESS THAN

  • Word Prior = ALT-SHIFT-J

  • Word = ALT-SHIFT-K

  • Word Next = ALT-SHIFT-L

  • Sentence Prior = ALT-SHIFT-7

  • Sentence = unavailable in browse mode

  • Sentence Next = unavailable in browse mode

  • Paragraph = Undefined on Laptop by default

  • Line Prior = ALT-SHIFT-U

  • Line = ALT-SHIFT-I

  • Line Next = ALT-SHIFT-O

The "speak parent element" command in Fire Vox (Ctrl+Shift+u) supports Example 3. This keystroke works without changing the focus. Fire Vox is a free screen reader designed specifically for Firefox 1.0 and later. It supports Windows, Macintosh, and Linux.

Description

The objective of this technique is to identify the purpose of a link from the link in its paragraph context. The paragraph enclosing the link provides context for an otherwise unclear link when the paragraph is the nearest enclosing block-level ancestor element. The description lets a user distinguish this link from links in the Web page that lead to other destinations and helps the user determine whether to follow the link. Note that simply providing the URI of the destination is generally not sufficiently descriptive.

Note: These descriptions will be most useful to the user if the additional information needed to understand the link precedes the link. If the additional information follows the link, there can be confusion and difficulty for screen reader users who are reading through the page in order (top to bottom).

Examples

Example 1

Announcements column on a Folk Festival Web page.

Example Code:

<h3>The final 15</h3>
<p>Coming soon to a town near you...the final 15 in the 
National Folk Festival lineup.
<a href="final15.html">[Read more...]</a>
</p>

<h3>Folk artists get awards</h3>
<p>Performers from the upcoming National Folk Festival receive 
 National Heritage Fellowships. 
 <a href="nheritage.html">[Read more...]</a>
</p>
…   

Resources

No resources available for this technique.

Tests

Procedure

For each link in the content that uses this technique:

  1. Check that the link is part of a paragraph.

  2. Check that text of the link combined with the text of its enclosing paragraph describes the purpose of the link.

Expected Results

  • The above checks are true.


H79: Identifying the purpose of a link using link text combined with its enclosing table cell and associated table headings

Applicability

All technologies that contain links.

This technique relates to:

Description

The objective of this technique is to identify the purpose of a link from the link in its data table context. This context is the table cell enclosing the link and the cell's associated headings. The data table context provides the purpose for an otherwise unclear link when the table cell is the nearest enclosing block-level ancestor element. It lets a user distinguish this link from other links in the Web page that lead to other destinations and helps the user determine whether to follow the link. Note that simply providing the URI of the destination is not sufficiently descriptive for people with disabilities, especially those with cognitive disabilities.

Examples

Example 1: A table of rental car choices

Example Code:

 <table>
<tr>
  <th></th>
  <th id="a1">Alamo</th>
  <th id="a2">Budget</th>
  <th id="a3">National</th>
  <th id="a4">Avis</th>
  <th id="a5">Hertz</th>
</tr>
<tr>
  <th id="b1">Economy cars</th>
  <td headers="a1 b1"><a href="econ_ala.htm">$67/day</a></td>
  <td headers="a2 b1"><a href="econ_bud.htm">$68/day</a></td>
  <td headers="a3 b1"><a href="econ_nat.htm">$72/day</a></td>
  <td headers="a4 b1"><a href="econ_av.htm">$74/day</a></td>
  <td headers="a5 b1"><a href="econ_hz.htm">$74/day</a></td>
</tr>
<tr>
  <th id="b2">Compact cars</th>
  <td headers="a1 b2"><a href="comp_ala.htm">$68/day</a></td>
  <td headers="a2 b2"><a href="comp_bud.htm">$69/day</a></td>
  <td headers="a3 b2"><a href="comp_nat.htm">$74/day</a></td>
  <td headers="a4 b2"><a href="comp_av.htm">$76/day</a></td>
  <td headers="a5 b2"><a href="comp_hz.htm">$76/day</a></td>
</tr>
<tr>
  <th id="b3">Mid-sized cars</th>
  <td headers="a1 b3"><a href="mid_ala.htm">$79/day</a></td>
  <td headers="a2 b3"><a href="mid_bud.htm">$80/day</a></td>
  <td headers="a3 b3"><a href="mid_nat.htm">$83/day</a></td>
  <td headers="a4 b3"><a href="mid_av.htm">$85/day</a></td>
  <td headers="a5 b3"><a href="mid_hz.htm">$85/day</a></td>
</tr>
<tr>
  <th id="b4">Full-sized cars</th>
  <td headers="a1 b4"><a href="full_ala.htm">$82/day</a></td>
  <td headers="a2 b4"><a href="full_bud.htm">$83/day</a></td>
  <td headers="a3 b4"><a href="full_nat.htm">$89/day</a></td>
  <td headers="a4 b4"><a href="full_av.htm">$91/day</a></td>
  <td headers="a5 b4"><a href="full_hz.htm">$91/day</a></td>
</tr>
</table>  

Resources

No resources available for this technique.

Tests

Procedure

For each link in the content that uses this technique:

  1. Check that the link is in a table cell.

  2. Check that text of the link combined with the text of the associated table heading describes the purpose of the link.

Expected Results

  • The above checks are true.


H80: Identifying the purpose of a link using link text combined with the preceding heading element

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

The command to take advantage of this technique in JAWS is "JAWS KEY + T".

Description

The objective of this technique is to describe the purpose of a link from the context provided by its heading context. The preceding heading provides context for an otherwise unclear link. The description lets a user distinguish this link from links in the Web page that lead to other destinations and helps the user determine whether to follow the link.

Note: Whenever possible, provide link text that identifies the purpose of the link without needing additional context.

Examples

Example 1: Blocks of information on hotels

The information for each hotel consists of the hotel name, a description and a series of links to a map, photos, directions, guest reviews and a booking form.

Example Code:

<h2><a href="royal_palm_hotel.html">Royal Palm Hotel</a></h2>
  <ul class="horizontal">
    <li><a href="royal_palm_hotel_map.html">Map</a></li>
    <li><a href="royal_palm_hotel_photos.html">Photos</a></li>
    <li><a href="hroyal_palm_hotel_directions.html">Directions</a></li>
    <li><a href="royal_palm_hotel_reviews.html">Guest reviews</a></li>
    <li><a href="royal_palm_hotel_book.html">Book now</a></li>
  </ul>

<h2><a href="hotel_three_rivers.html">Hotel Three Rivers</a></h2>
  <ul class="horizontal">
    <li><a href="hotel_three_rivers_map.html">Map</a></li>
    <li><a href="hotel_three_rivers_photos.html">Photos</a></li>
    <li><a href="hotel_three_rivers_directions.html">Directions</a></li>
    <li><a href="hotel_three_rivers_reviews.html">Guest reviews</a></li>
    <li><a href="hotel_three_rivers_book.html">Book now</a></li>
  </ul>     

Example 2: A document provided in three formats

Example Code:

<h2>Annual Report 2006-2007</h2>
<p> 
  <a href="annrep0607.html">(HTML)</a>&nbsp;
  <a href="annrep0607.pdf">(PDF)</a>&nbsp;
  <a href="annrep0607.rtf">(RTF)</a>
</p>       

Example 3: Newspaper Web site

Example Code:

<h2><a href="Stockmarket_05052007.htm>Stock market soars as bullishness prevails</a></h2>
<p>this week was a stellar week for the stock market as investing in gold rose 2%. 
<a href="Stockmarket_05052007.htm>More here</a></p>     

Resources

No resources available for this technique.

Tests

Procedure

For each link in the content that uses this technique:

  1. Find the heading element that precedes the link

  2. Check that the text of the link combined with the text of that heading describes the purpose of the link.

Expected Results

  • #2 is true.


H81: Identifying the purpose of a link in a nested list using link text combined with the parent list item under which the list is nested

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

Although the context information is programmatically associated with the link, assistive technology lacks commands for reading the parent list item without moving focus away from the link.

Description

The objective of this technique is to describe the purpose of a link in a nested list from the context provided by the list item under which the list is nested. This list item provides context for an otherwise unclear link. The description lets a user distinguish this link from links in the Web page that lead to other destinations and helps the user determine whether to follow the link.

Because current assistive technologies do not include commands to query information contextual information provided by parent list items, use of this technique requires users to navigate the list one item at a time. Therefore, this technique may not be appropriate for very long or deeply nested lists.

Note: Whenever possible, provide link text that identifies the purpose of the link without needing additional context.

Examples

Example 1: A document provided in three formats

Example Code:

<ul>
<li>Annual Report 2005-2006
  <ul> 
  <li><a href="annrep0506.html">(HTML)</a></li>
  <li><a href="annrep0506.pdf">(PDF)</a></li>
  <li><a href="annrep0506.rtf">(RTF)</a></li>
  </ul>
</li>
<li>Annual Report 2006-2007
  <ul> 
  <li><a href="annrep0607.html">(HTML)</a></li>
  <li><a href="annrep0607.pdf">(PDF)</a></li>
  <li><a href="annrep0607.rtf">(RTF)</a></li>
  </ul>
</li>
</ul> 

Example 2: Blocks of information on hotels

The information for each hotel consists of the hotel name, a description and a series of links to a map, photos, directions, guest reviews and a booking form.

Example Code:

<ul>
<li><a href="royal_palm_hotel.html">Royal Palm Hotel</a>
  <ul class="horizontal">
    <li><a href="royal_palm_hotel_map.html">Map</a></li>
    <li><a href="royal_palm_hotel_photos.html">Photos</a></li>
    <li><a href="hroyal_palm_hotel_directions.html">Directions</a></li>
    <li><a href="royal_palm_hotel_reviews.html">Guest reviews</a></li>
    <li><a href="royal_palm_hotel_book.html">Book now</a></li>
  </ul>
</li>
<li><a href="hotel_three_rivers.html">Hotel Three Rivers</a>
  <ul class="horizontal">
    <li><a href="hotel_three_rivers_map.html">Map</a></li>
    <li><a href="hotel_three_rivers_photos.html">Photos</a></li>
    <li><a href="hotel_three_rivers_directions.html">Directions</a></li>
    <li><a href="hotel_three_rivers_reviews.html">Guest reviews</a></li>
    <li><a href="hotel_three_rivers_book.html">Book now</a></li>
  </ul>
</li>
</ul> 

Resources

No resources available for this technique.

Tests

Procedure

For each link in the content that uses this technique:

  1. Find the ul or ol element that contains the link

  2. Check that this list element (ul, ol) is a descendant of an li element

  3. Check that the text of the link combined with the text of that li element describes the purpose of the link.

Expected Results

  • The above checks are true.


H83: Using the target attribute to open a new window on user request and indicating this in link text

Applicability

HTML 4.01 Transitional and XHTML 1.0 Transitional

This technique relates to:

Description

The objective of this technique is to avoid confusion that may be caused by the appearance of new windows that were not requested by the user. Suddenly opening new windows can disorientate or be missed completely by some users. In HTML 4.01 Transitional and XHTML 1.0 Transitional, the target attribute can be used to open a new window, instead of automatic pop-ups. (The target attribute is deleted from HTML 4.01 Strict and XHTML 1.0 Strict.) Note that not using the target allows the user to decide whether a new window should be opened or not. Use of the target attribute provides an unambiguously machine-readable indication that a new window will open. User agents can inform the user, and can also be configured not to open the new window. For those not using assistive technology, the indication would also be available from the link text.

Examples

Example 1

The following example illustrates the use of the target attribute in a link that indicates it will open in a new window.

Example Code:

<a href="help.html" target="_blank">Show Help (opens new window)</a>

Tests

Procedure

  1. Activate each link in the document to check if it opens a new window.

  2. For each link that opens a new window, check that it uses the target attribute.

  3. Check that the link text contains information indicating that the link will open in a new window.

Expected Results

  • Checks #2 and #3 are true.


H84: Using a button with a select element to perform an action

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to allow the user to control when an action is performed, rather than having the action occur as a side effect of choosing a value for the select element. The user may inspect the different values of the select element, or may accidentally choose the wrong value, without causing the action to occur. When the user is satisfied with their choice, they select the button to perform the action.

This is particularly important for users who are choosing the value of the select element via the keyboard, since navigating through the options of the select element changes the value of the control.

Examples

Example 1: A Calendar

A Web page lets the user choose any month of any year and display the calendar for that month. After the user has set the month and year, he displays the calendar by pressing the "Show" button. This example replies on client-side scripting to implement the action.

Example Code:


<label for="month">Month:</label>
<select name="month" id="month">
  <option value="1">January</option>
  <option value="2"> February</option>
  ...
  <option value="12">December</option>
</select> 
<label for="year">Year:</label>
<input type="text" name="year" id="year">
<input type="button" value="Show" onclick = "...">

Example 2: Choosing an action

A select element contains a list of possible actions. The action is not performed until the user presses the "Do it" button.

Example Code:


<form action="http://somesite.com/action" method="post">
  <label for="action">Options:</label>
  <select name="action" id="action">
    <option value="help">Help</option>
    <option value="reset">Reset</option>
    <option value="submit">Submit</option>
  </select> 
  <button type="submit" name="submit" value="submit">Do It </button>
</form>              

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

For each select element/button element combination:

  1. Check that focus (including keyboard focus) on an option in the select element does not result in any actions

  2. Check that selecting the button performs the action associated with the current select value

Expected Results

  • All checks are true.


H85: Using OPTGROUP to group OPTION elements inside a SELECT

Applicability

HTML and XHTML pages that collect user input.

This technique relates to:

User Agent and Assistive Technology Support Notes

[begin change]

The optgroup element is not widely supported by many screen readers including JAWS 11 and below or Window-Eyes 6 and below.

[end change]
[begin change]

The label attribute for option and optgroup is supported inconsistently across user agents and is not widely supported by screen readers including JAWS 11 and below and Window-Eyes 6 and below.

[end change]

Description

The objective of this technique is to group items in a selection list. A selection list is a set of allowed values for a form control such as a multi-select list or a combo box. Often, selection lists have groups of related options. Those groups should be semantically identified, rather than simply delimiting the groups with "dummy" list entries. This allows user agents to collapse the options by group to support quicker skimming of the options, and to indicate in what group an option of interest is located. It also helps to visually break up long lists so that users can more easily locate the option(s) they are interested in.

In HTML, the select element is used to create both multi-select lists and combo boxes. The various allowed options are each indicated with option elements. To group options together, use the optgroup element, with the related option elements inside that element. Label the group with the "label" attribute so users will know what to expect inside the group.

The optgroup element should be directly inside the select element, and the option elements directly inside the optgroup. It is possible for a select element to contain both single option elements and optgroup groups, though authors should consider if this is in fact the design intent when using this. It is not possible to nest the optgroup element, so only one level of grouping can be done within a select.

[begin add]

If grouping information is essential to understanding the list, authors may define option labels that can be understood even when the screen reader does not present the grouping information provided by optgroup.

[end add]

Examples

Example 1

The following combo box collects data about favorite foods. Grouping by type allows users to select their preference more quickly.

Example Code:


<form action="http://example.com/prog/someprog" method="post">
    <label for="food">What is your favorite food?</label>
    <select id="food" name="food">
      <optgroup label="Fruits">
        <option value="1">Apples</option>
        <option value="3">Bananas</option>
        <option value="4">Peaches</option>
        <option value="5">...</option>
      </optgroup>
      <optgroup label="Vegetables">
        <option value="2">Carrots</option>
        <option value="6">Cucumbers</option>
       <option value="7">...</option>
     </optgroup>
     <optgroup label="Baked Goods">
       <option value="8">Apple Pie</option>
       <option value="9">Chocolate Cake</option>
       <option value="10">...</option>
     </optgroup>
   </select>
</form>              

Example 2

The following example shows how a multi-select box can make use of the optrgroup element.

Example Code:


<form action="http://example.com/prog/someprog" method="post">
    <label for="related_techniques"><strong>Related Techniques:</strong></label>
    <select name="related_techniques" id="related_techniques" multiple="multiple" size="10">
  <optgroup label="General Techniques">
    <option value="G1">G1: Adding a link at the top of each page ... </option>
    <option value="G4">G4: Allowing the content to be paused and restarted ... </option>
    <option value="G5">G5: Allowing users to complete an activity without any time... </option>
    <option value="G8">G8: Creating an extended audio description for the ... </option>
    <option value="G9">G9: Creating captions for live synchronized media... </option>
    <option value="G10">G10: Creating components using a technology that ... </option>
  </optgroup>
  <optgroup label="HTML Techniques">
    <option value="H2">H2: Combining adjacent image and text links for the same ... </option>
    <option value="H4">H4: Creating a logical tab order through links, form ... </option>
    <option value="H24">H24: Providing text alternatives for the area ...
    </option>
  </optgroup>
  <optgroup label="CSS Techniques">
    <option value="C6">C6: Positioning content based on structural markup... </option>
    <option value="C7">C7: Using CSS to hide a portion of the link text... </option>
  </optgroup>
  <optgroup label="SMIL Techniques">
    <option value="SM1">SM1: Adding extended audio description in SMIL 1.0... </option>
    <option value="SM2">SM2: Adding extended audio description in SMIL 2.0... </option>
    <option value="SM6">SM6: Providing audio description in SMIL 1.0... </option>
  </optgroup>
  <optgroup label="ARIA Techniques">
    <option value="ARIA1">ARIA1: Using WAI-ARIA describedby... </option>
    <option value="ARIA2">ARIA2: Identifying required fields with the "required"... </option>
    <option value="ARIA3">ARIA3: Identifying valid range information with "valuemin" ... </option>
    <option value="ARIA4">ARIA4: Using WAI-ARIA to programmatically identify form  ... </option>
  </optgroup>
  <optgroup label="Common Failures">
    <option value="F1">F1: Failure of SC 1.3.2 due to changing the meaning of content by... </option>
    <option value="F2">F2: Failure of SC 1.3.1 due to using changes in text presentation... </option>
    <option value="F3">F3: Failure of SC 1.1.1 due to using CSS to include images  ... </option>
    <option value="F4">F4: Failure of SC 2.2.2 due to using text-decoration:blink ...</option>
  </optgroup>
</select>
</form>              

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Check the set of options within a selection list to see if there are groups of related options.

  2. If there are groups of related options, they should be grouped with optgroup.

Expected Results

  • Check #2 is true.


H86: Providing text alternatives for ASCII art, emoticons, and leetspeak

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

  • Assistive technologies provide different levels of support for speaking title attributes. Some do not include features that allow users to access information provided via the title attribute.

  • Implementing this technique with the title attribute is only sufficient if the title attribute is accessibility supported. The content of the title attribute needs to be available to all keyboard users (not only those with text-to-speech software) for this attribute to be accessibility supported.

  • JAWS 6.2 and higher and WindowEyes 5.0 and higher support the abbr and acronym elements. They can all be set to speak the title attribute when these elements are encountered, but this is not the default setting and is often not turned on by users.

  • Many graphical user agents render text enclosed within an abbr or acronym element with a dotted line below or surrounding it. In addition, when the mouse hovers over the element, the expansion is displayed as a tool tip.

  • In Internet Explorer 7 and below, items marked using the abbr element are not displayed with any additional formatting. For IE 6 and below, the expanded version does not display as a tooltip when the mouse hovers over the item.

  • Within a given user agent or assistive technology, abbr and acronym elements are presented to users in the same way.

Description

Before graphics became widely used on the internet, ASCII characters were often arranged to form pictures or graphs. Although ASCII art is not used frequently on the Web anymore, it must be remembered that, when it is used, it is very confusing to people who are blind and accessing the internet using screen readers. If it is used it should also have a text explanation of what the picture is. It is also suggested that there be a link to skip over the ASCII art (although this is not required).

Emoticons are very popular. They include ASCII characters that form facial expressions and other ways to communicate an emotion. They can be confusing for screen reader users. When possible it is better simply to use a word like "smile" instead of an emoticon. But if emoticons are used they should have a text alternative. In some contexts, blog and forum software for example, plug-ins are available that automatically convert ASCII characters used as emoticons into HTML images with text alternatives.

Leetspeak uses various combinations of ASCII characters to replace Latinate letters. Leet has become a part of Internet culture and slang. Leet is frequently used to beat text and spam filters. It is often incomprehensible to blind people using screen readers, and therefore requires a text alternative in order to conform to Success Criteria 1.1.1.

Note: Because support for this technique is limited, it is recommended that authors provide the text alternative in text.

Examples

Example 1

The following shows three options for providing alternatives for an emoticon representing "fright," which is made out of an equal sign followed by the number eight, a hyphen and the number zero.

Example Code:


=8-0 (fright)

<abbr title="fright">=8-0</abbr>

<img src="fright.gif" alt="fright"/>
             

Example 2

Here is ASCII art with an explanation of the picture preceding it. It includes a link to skip over the ASCII art. Skip ASCII example.

Example Code:


 Figure 1: ASCII art picture of a butterfly. 
 <a href="#skipbutterfly">Skip ASCII image</a>
                                 
                                                                LLLLLLLLLLL
                                                            __LLLLLLLLLLLLLL
                                                           LLLLLLLLLLLLLLLLL
                                                         _LLLLLLLLLLLLLLLLLL
                                                        LLLLLLLLLLLLLLLLLLLL
                                                      _LLLLLLLLLLLLLLLLLLLLL
                                                      LLLLLLLLLLLLLLLLLLLLLL
                                              L     _LLLLLLLLLLLLLLLLLLLLLLL
                                             LL     LLLLLL~~~LLLLLLLLLLLLLL
                                            _L    _LLLLL      LLLLLLLLLLLLL
                                            L~    LLL~        LLLLLLLLLLLLL
                                           LL   _LLL        _LL   LLLLLLLL
                                          LL    LL~         ~~     ~LLLLLL
                                          L   _LLL_LLLL___         _LLLLLL
                                         LL  LLLLLLLLLLLLLL      LLLLLLLL
                                         L  LLLLLLLLLLLLLLL        LLLLLL
                                        LL LLLLLLLLLLLLLLLL        LLLLL~
                  LLLLLLLL_______       L _LLLLLLLLLLLLLLLL     LLLLLLLL
                         ~~~~~~~LLLLLLLLLLLLLLLLLLLLLLLLL~       LLLLLL
                       ______________LLL  LLLLLLLLLLLLLL ______LLLLLLLLL_
                   LLLLLLLLLLLLLLLLLLLL  LLLLLLLL~~LLLLLLL~~~~~~   ~LLLLLL
             ___LLLLLLLLLL __LLLLLLLLLLLLL LLLLLLLLLLLLL____       _LLLLLL_
          LLLLLLLLLLL~~   LLLLLLLLLLLLLLL   LLLLLLLLLLLLLLLLLL     ~~~LLLLL
      __LLLLLLLLLLL     _LLLLLLLLLLLLLLLLL_  LLLLLLLLLLLLLLLLLL_       LLLLL
     LLLLLLLLLLL~       LLLLLLLLLLLLLLLLLLL   ~L ~~LLLLLLLLLLLLL      LLLLLL
   _LLLLLLLLLLLL       LLLLLLLLLLLLLLLLLLLLL_  LL      LLLLLLLLL   LLLLLLLLL
  LLLLLLLLLLLLL        LLLLLLLLLLLLL~LLLLLL~L   LL       ~~~~~       ~LLLLLL
 LLLLLLLLLLLLLLL__L    LLLLLLLLLLLL_LLLLLLL LL_  LL_            _     LLLLLL
LLLLLLLLLLLLLLLLL~     ~LLLLLLLL~~LLLLLLLL   ~L  ~LLLL          ~L   LLLLLL~
LLLLLLLLLLLLLLLL               _LLLLLLLLLL    LL  LLLLLLL___     LLLLLLLLLL
LLLLLLLLLLLLLLLL              LL~LLLLLLLL~     LL  LLLLLLLLLLLL   LLLLLLL~
LLLLLLLLLLLLLLLL_  __L       _L  LLLLLLLL      LLL_ LLLLLLLLLLLLLLLLLLLLL
 LLLLLLLLLLLLLLLLLLLL        L~  LLLLLLLL      LLLLLLL~LLLLLLLLLLLLLLLL~
  LLLLLLLLLLLLLLLLLLLL___L_ LL   LLLLLLL       LLLL     LLLLLLLLLLLLLL
   ~~LLLLLLLLLLLLLLLLLLLLLLLL     LLLLL~      LLLLL        ~~~~~~~~~
           LLLLLLLLLLLLLLLLLL_ _   LLL       _LLLLL
               ~~~~~~LLLLLLLLLL~             LLLLLL
                         LLLLL              _LLLLLL
                         LLLLL    L     L   LLLLLLL
                          LLLLL__LL    _L__LLLLLLLL
                          LLLLLLLLLL  LLLLLLLLLLLL
                           LLLLLLLLLLLLLLLLLLLLLL
                            ~LLLLLLLLLLLLLLLLL~~
                               LLLLLLLLLLLLL
                                 ~~~~~~~~~
<a name="skipbutterfly"></a>            

Example 3

The following is Leetspeak for "Austin Rocks".

Example Code:


<abbr title="Austin Rocks">Au5t1N r0xx0rz</abbr>             

Tests

Procedure

  1. Open the page in a common browser.

  2. Check to see that the content contains ASCII art, emoticons and/or leetspeak.

  3. Check that there is a text alternative immediately before or after all ASCII art, emoticons and/or Leetspeak.

Expected Results

  • Test procedure #3 is true.


H87: Not interfering with the user agent's reflow of text as the viewing window is narrowed

Applicability

Not interfering with the user agent's reflow of text as the viewing window is narrowed

This technique relates to:

Description

This technique helps avoid situations where horizontal scrolling may occur. Many people with cognitive disabilities and low vision users who do not use assistive technology have a great deal of trouble with blocks of text that require horizontal scrolling. It involves not interfering with the reflow of text if the window is narrowed. One of the best ways to do this to define widths of text block containers in percentages.

HTML and XHTML user agents automatically reflow text as the browser window is narrowed as long as the author does not specify widths using absolute measurements such as pixels or points.

Examples

Example 1

A newspaper site includes articles with columns that adjust with the user agents window width. Users with cognitive disabilities can narrow the column to a width that makes it easier to read.

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Open the content that contains a block of text in a common browser.

  2. Narrow the viewing window to 1/4 of the screen width.

  3. Check to see that the content does not require horizontal scrolling to read a line of text.

Expected Results

  • Check #3 is true.


H88: Using HTML according to spec

Applicability

HTML and XHTML

This technique relates to:

Description

The objective of this technique is to use HTML and XHTML according to their respective specifications. Technology specifications define the meaning and proper handling of features of the technology. Using those features in the manner described by the specification ensures that user agents, including assistive technologies, will be able to present representations of the feature that are accurate to the author's intent and interoperable with each other.

At the time this technique was published, the appropriate versions of these technologies is HTML 4.01 and XHTML 1.0. HTML 4.01 is the latest mature version of HTML, which provides specific accessibility features and is widely supported by user agents. XHTML 1.0 provides the same features as HTML 4.01, except that it uses an XML structure, has a more strict syntax than the HTML structure. Later versions of these technologies are not mature and / or are not widely supported by user agents at this time.

There are a few broad aspects to using HTML and XHTML according to their specification.

  1. Using only features that are defined in the specification HTML defines sets of elements, attributes, and attribute values that may be used on Web pages. These features have specific semantic meanings and are intended to be processed by user agents in particular ways. Sometimes, however, additional features come into common authoring practice. These are usually initially supported by only one user agent. When features not in the specification are used, many user agents may not support the feature for a while or ever. Furthermore, lacking standard specifications for the use of these features, different user agents may provide varying support. This impacts accessibility because assistive technologies, developed with fewer resources than mainstream user agents, may take a long time if ever to add useful support. Therefore, authors should avoid features not defined in HTML and XHTML to prevent unexpected accessibility problems.

  2. Using features in the manner prescribed by the specification The HTML specification provides specific guidance about how particular elements, attributes, and attribute values are to be processed and understood semantically. Sometimes, however, authors use features in a manner that is not supported by the specification, for example, using semantic elements to achieve visual effects without intending the underlying semantic message to be conveyed. This leads to confusion for user agents and assistive technologies that rely on correct semantic information to present a coherent representation of the page. It is important to use HTML features only as prescribed by the HTML specification.

  3. Making sure the content can be parsed HTML and XHTML also define how content should be encoded in order to be correctly processed by user agents. Rules about the structure of start and end tags, attributes and values, nesting of elements, etc. ensure that user agents will parse the content in a way to achieve the intended document representation. Following the structural rules in these specifications is an important part of using these technologies according to specification.

Resources

Resources are for information purposes only, no endorsement implied.

Refer to the resources section of G134: Validating Web pages.

Tests

Procedure

For each HTML or XHTML page:

  1. Check that the page uses only elements, attributes, and attribute values that are defined in the relevant specification.

  2. Check that elements, attributes, and values are used in the manner prescribed by the relevant specification.

  3. Check that the page can be parsed correctly, according to the rules of the relevant specification.

Note: Check #1 and #3 are most easily checked with page validation tools. Check #2 can be checked with the assistance of heuristic evaluation tools though manual judgment is usually required.

Expected Results

  • Checks #1, #2, and #3 are true.


H89: Using the title attribute to provide context-sensitive help

Applicability

HTML and XHTML

This technique relates to:

User Agent and Assistive Technology Support Notes

  • Some current assistive technology provide feedback to the user when form fields have title attribute content available.

  • Some graphical user agents will display a tool tip when the mouse hovers above a form field containing a title attribute. However, current user agents do not provide access to the title attribute content via the keyboard.

  • The tool tip in some common user agents disappears after a short period of time (approximately 5 seconds). This can cause difficulty accessing title attribute content for those users who can use a mouse but have fine motor skill impairment, and may result in difficulties for users who need more time to read the tool tip.

  • It is difficult for most users to resize, adjust background colors, reposition or otherwise control the presentation of title attribute content in many current user agents.

  • This technique can only be used when the element has an explicitly associated label. In the absence of a lable, the title will be used as the Name in the accessibility API of current user agents that support one. The help text described below makes a poor name.

Description

The objective of this technique is to provide context sensitive help for users as they enter data in forms by providing the help information in a title attribute. The help may include format information or examples of input.

Note: Current user agents and assistive technologies do not always provide the information contained in the title attribute to users. Avoid using this technique in isolation until the title attribute has wide-spread support.

Examples

Example 1

A mapping application provides a form consisting of a label "Address:", an input box and a submit button with value "Find map". The input box has a title attribute value with an example of the address format the user should enter.

Example Code:


<label for="searchAddress">Address: </label>
<input id="searchAddress" type="text" size="30" value="" name="searchAddress" 
 title="Address example: 101 Collins St, Melbourne, Australia" />
             

Example 2

A form that allows users to pay their bill online requires the user to enter their account number. The input box associated with the "Account number" label has a title attribute providing information on locating the account number.

Example Code:


<label for="accNum1">Account number: </label>
<input id="accNum1" type="text" size="10" value="" title="Your account number 
 can be found in the top right-hand corner of your bill." />
             

Tests

Procedure

  1. Identify form controls that require text input.

  2. Check that each form control has an explicitly associated label

  3. Check that each form control has context-sensitive help provided in the title attribute.

Expected Results

  • Checks #2 and #3 are true.


H90: Indicating required form controls

Applicability

HTML and XHTML controls that use external labels.

This technique relates to:

User Agent and Assistive Technology Support Notes

The HTML and XHTML specifications allow both implicit and explicit labels. However, some assistive technologies do not correctly handle implicit labels (for example, <label>First name <input type="text" name="firstname"></label>).

  • JAWS 7.10 was tested on Windows XP with Internet Explorer 6.0 and Firefox 1.5. It reads the label for explicit and implicit labels for text fields in both virtual PC cursor and forms reading mode. In forms mode it does not read the label for implicit labels on checkboxes and radio fields.

  • Window-Eyes 5.5 was tested on Windows XP with Internet Explorer 6.0 and Firefox 1.5. It will always speak the label for an explicitly labelled form field. It does not speak the label for the implicitly labelled form control in browse on mode but will speak the implicit label when navigating from control to control in browse off mode.

User agents will display a tool tip when the mouse hovers above an input element containing a title attribute. Title attributes are exposed to assistive technology and are displayed as tooltips in many graphical browsers. Tooltips can't be opened via the keyboard, so this information may not be available to sighted keyboard users.

If no label is available, JAWS and Window-Eyes speak the title attribute when the form control receives focus

  • JAWS 6.0 and later can be set to speak both label and title when the two items are different; however, very few users are aware of this setting.

  • WindowEyes 5.5 has a hot key, ins-E, that will display additional information, including the title attribute, for the item with focus.

Some user agents (specifically the Window-Eyes screen reader) do not by default voice the asterisk character in form labels. There is a preference that Window-Eyes users can modify to adjust this behavior but many users should be expected not to have made this change.

Description

The objective of this technique is to provide a clear indication that a specific form control in a Web application or form is required for successful data submission. A symbol or text indicating that the control is required is programmatically associated with the field by using the label element, or the legend for groups of controls associated via fieldset. If a symbol is used, the user is advised of its meaning before the first use.

Examples

Example 1: Using text to indicate required state

The text field in the example below has the explicit label of "First name (required):". The label element's for attribute matches the id attribute of the input element and the label text indicates that the control is required.

Example Code:


<label for="firstname">First name (required):</label> 
<input type="text" name="firstname" id="firstname" />

Note: Some authors abbreviate "required" to "req." but there is anecdotal evidence that suggests that this abbreviation is confusing.

Example 2: Using an asterisk to indicate required state

The text field in the example below has an explicit label that includes an asterisk to indicate the control is required. It is important that the asterisk meaning is defined at the start of the form. In this example, the asterisk is contained within a span element to allow for the asterisk character to be styled so that it is larger than the default asterisk character, since the asterisk character can be difficult to see for those with impaired vision.

Example Code:


CSS:
.req {font-size: 150%} 

HTML:

<p> Required fields are marked with an asterisk (<abbr class="req" title="required">*</abbr>).</p>
<form action="http://www.test.com" method="post">
<label for="firstname">First name <abbr class="req" title="required">*</abbr>:</label> 
<input type="text" name="firstname" id="firstname" />

Example 3: Using an image to indicate required state

The text field in the example below has an explicit label that includes an image to indicate the control is required. It is important that the image meaning is defined at the start of the form.

Example Code:


<p><img src="req_img.gif" alt="Required Control" /> indicates that the form control is required</p>
<form action="http://www.test.com" method="post">
<label for="firstname">First name <img src="req_img.gif" alt="Required Control" />:</label> 
<input type="text" name="firstname" id="firstname" />
...

Example 4: Indicating required state for groups of radio buttons or check box controls

Radio buttons and checkboxes are treated differently than other interactive controls since individual radio buttons and checkboxes are not required but indicates that a response for the group is required. The methods used in examples 1-3 apply to radio buttons and checkboxes, but the indication of the required state should be placed in the legend element instead of the label element.

Example Code:


<fieldset>
<legend>I am interested in the following (Required):</legend>
<input type="checkbox" id="photo" name="interests" value="ph">
<label for="photo">Photography</label></br>
<input type="checkbox" id="watercol" name="interests" checked="checked" value="wa">
<label for="watercol">Watercolor</label></br>
<input type="checkbox" id="acrylic" name="interests" checked="checked" value="ac">
<label for="acrylic">Acrylic</label>
…
</fieldset>

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. For each required form control, check that the required status is indicated in the form control's label or legend.

  2. For each indicator of required status that is not provided in text, check that the meaning of the indicator is explained before the form control that uses it.

Expected Results

  • All checks above are true.


H91: Using HTML form controls and links

Applicability

HTML form controls and links

This technique relates to:

Description

The objective of this technique is to use standard HTML form controls and link elements to provide keyboard operation and assistive technology interoperability of interactive user interface elements.

User agents provide the keyboard operation of HTML form controls and links. In addition, the user agent maps the form controls and links to an accessibility API. Assistive technologies use the accessibility API to extract appropriate accessibility information, such as role, name, state, and value, and present them to users. The role is provided by the HTML element, and the name is provided by the text associated with that element. Elements for which values and states are appropriate also expose the values and states via multiple mechanisms.

In some cases, the text is already associated with the control through a required attribute. For example, submit buttons use the button element text or image 'alt' attribute as the name. In the case of form controls, label elements or 'title' attributes are used. The following table describes how the role, name, value, and state are determined for HTML link and form controls.

HTML element RoleName Value State
<a> link 'title' attribute, text within <a> element or 'alt' attribute if image link. Concatenated if both text and image 'alt' attribute are provided 'href' attribute
<button> push button text inside <button> element or 'title' attribute
<fieldset> grouping <legend> element
<input type = "button", "submit", or "reset"> push button 'value' attribute
<input type = "image"> push button 'alt' attribute or 'title' attribute
<input type = "text"> editable text <label> element associated with it or 'title' attribute 'value' attribute
<input type = "password"> editable text <label> element associated with it or 'title' attribute
<input type="checkbox"> checkbox <label> element associated with it or 'title' attribute 'checked' attribute
<input type="radio"> radio button <label> element associated with it or 'title' attribute 'checked' attribute
<select> combobox, list, or dropdown list <label> element associated with it or 'title' attribute <option> element with 'selected' attribute set to "selected"
<textarea> editable text <label> element associated with it or 'title' attribute text within <textarea> element

Examples

Example 1: Links

User agents provide mechanisms to navigate to and select links. In each of the following examples, the role is "link" from the <a href>. Note that <a name> does not provide a role of "link". The value is the URI in the 'href' attribute.

Example 1a

In example 1a, the name is the text inside the link, in this case "Example Site".

Example Code:

<a href="www.example.com">Example Site</a>
                    
Example 1b

In example 1b of an image inside a link, the 'alt' attribute for the image provides the name. Some tools for viewing APIs, such as Microsoft Inspect Objects, will not surface this, but AT does.

Example Code:

<a href="www.example.com"><img src="example_logo.gif" alt="Example"></a>
                    
Example 1c

In example 1c, the name will be concatenated from the different elements inside the link to read "Example Text"

Example Code:

<a href="www.example.com"><img src="example_logo.gif" alt="Example">Text</a>

Example 2: Buttons

There are several ways to create a button in HTML, and they all map to the "push button" role.

Example 2a

In example 2a, the text is contained in the button element, in this case "save", as the name. There is no value.

Example Code:

<button>Save</button>
                    
Example 2b

Example 2b uses the 'value' attribute, in this case "Save", "Submit", or "Reset" as the name.

Example Code:

<input type="button" value="Save" /> 
<input type="submit" value="Submit" />  
<input type="reset" value="Reset" />   
                    
Example 2c

Example 2c uses the 'alt' attribute, in this case "save", as the name.

Example Code:

<input type="image" src="save.gif" alt="save" /> 
                    
Example 2d

In example 2d, there is no 'alt' attribute so the 'title' attribute, in this case "save", is used as the name.

Example Code:

<input type="image" src="save.gif" title="save" />
                    
Example 2e
[begin change]

Example 2e clarifies how the user agent determines the name if the author specifies both the 'alt' and 'title' attributes of the input element. In this case, the user agent uses the 'alt' attribute ("Save") and ignores the 'title' attribute.

[end change]
[begin change]

Example Code:

<input type="image" src="save.gif" alt="save" title="save the file" />
[end change]

Example 3:

Example 3a

In example 3a, the input field has a role of "editable text". The label element is associated to the input element via the 'for' attribute which references the 'id' attribute of the inpu> element. The name comes from the label element, in this case, "Type of fruit". Its value comes from its value attribute, in this case "bananas".

Example Code:

<label for="text_1">Type of fruit</label>
<input id="text_1" type="text" value="bananas">
Example 3b

In example 3b, the input field has the same role and value as example 3a, but gets its name from the 'title' attribute.

Example Code:

<input id="text_1" type="text" value="bananas" title="Type of fruit">

Example 4: Checkbox

Example 4 has a role of "checkbox", from the 'type' attribute of the input element. The label element is associated with the input element via the 'for' attribute which refers to the 'id' attribute of the input element. The name comes from the label element, in this case "cheese". Its state can be "checked" or "unchecked" and comes from the 'checked' attribute. The state can be changed by the user's interaction with the control.

Example Code:

<label for="cb_1">Cheese</label> 
<input id="cb_1" type="checkbox" checked="checked">
                    

Example 5: Radio Buttons

Example 5 has a role of "radio button" from the 'type' attribute on the input element. Its name comes from the label element. The state can be "checked" or "unchecked" and comes from the 'checked' attribute. The state can be changed by the user.

Example Code:

<input type="radio" name="color" id="r1" checked="checked"/><label for="r1">Red</label>
<input type="radio" name="color" id="r2" /><label for="r2">Blue</label>
<input type="radio" name="color" id="r3" /><label for="r3">Green</label>
                    

Example 6:

Example 6a

Example 6a has a role of "Combobox" from the select element. Its name is "Numbers" from the label element. Forgetting to give a name to the select is a common error. The value is the option element that has the 'selected' attribute set to "selected". In this case, the default value is "Two".

Example Code:

<label for="s1">Numbers</label>
<select id="s1" size="1">
 <option>One</option>
 <option selected="selected">Two</option>
 <option>Three</option>
</select>
                    
Example 6b

Example 6b has the same name, role, and value as the above, but sets the name with the 'title' attribute on the select element. This technique can be used when a visible label is not desirable.

Example Code:

<select id="s1" title="Numbers" size="1">
 <option>One</option>
 <option selected="selected">Two</option>
 <option>Three</option>
</select>
                    

Example 7: Textarea

Example 7a

Example 7a has a role of "editable text" from the textarea element. The name is "Type your speech here" from the label element. The value is the content inside the textarea element, in this case "Four score and seven years ago".

Example Code:

<label for="ta_1">Type your speech here</label>
<textarea id="ta_1" >Four score and seven years ago</textarea>
                    
Example 7b

Example 7b has the same role, name, and value, but sets the name using the 'title' attribute.

Example Code:

<textarea id="ta_1" title="Type your speech here" >Four score and seven years ago</textarea>
                    

Example 8:

Radio Fieldset

The radio fieldset in example 8 has a role of "grouping". The name comes from the legend element.

Example Code:

<fieldset>
  <legend>Choose a Color:</legend> 
     <input id="red" type="radio" name="color" value="red" /><label for="red">Red</label><br /> 
     <input id="blue" type="radio" name="color" value="blue" /><label for="blue">Blue</label><br /> 
     <input id="green" type="radio" name="color" value="green" /><label for="green">Green</label> 
</fieldset>
                    

Resources

Resources are for information purposes only, no endorsement implied.

Tests

Procedure

  1. Inspect the HTML source code.

  2. For each instance of links and form elements, check that the name, value, and state are specified as indicated in the table above.

Expected Results

  • Check #2 is true.