- From: Steven Faulkners via cvs-syncmail <cvsmail@w3.org>
- Date: Tue, 13 Apr 2010 08:57:05 +0000
- To: public-html-commits@w3.org
Update of /sources/public/html5/alt-techniques In directory hutz:/tmp/cvs-serv14203 Modified Files: Overview.html Log Message: updated alt technique methods with advantages and disadvantages for most methods. Index: Overview.html =================================================================== RCS file: /sources/public/html5/alt-techniques/Overview.html,v retrieving revision 1.8 retrieving revision 1.9 diff -u -d -r1.8 -r1.9 --- Overview.html 7 Apr 2010 13:25:35 -0000 1.8 +++ Overview.html 13 Apr 2010 08:57:03 -0000 1.9 @@ -237,7 +237,7 @@ </head> <body> <h1>HTML5: Techniques for providing useful text alternatives</h1> -<h2>Editor's Draft 7th April 2010</h2> +<h2>Editor's Draft 13th April 2010</h2> <h3>Editor:</h3> <p><a href="mailto:sfaulkner@paciellogroup.com">Steve Faulkner</a>, The Paciello Group.</p> <hr> @@ -326,21 +326,78 @@ <ul> <li>Content of the alt attribute is not available to some users who may find it useful.</li> <li>If the alt attribute content is too long it may cause display issues in some browsers.</li> + <li>If the alt attribute content is too long it may cause raeding issues in some assistive technologies.</li> <li>Semantic structure cannot be added to alt attribute content.</li> </ul> <p> </p> <h3>The <code>figure</code> and <code>figcaption</code> elements</h3> <p><span class="note">to do</span></p> +<h5>Advantages:</h5> +<ul> + <li>When supported by browsers and assistive technology the content of the figcaption will explicitly associated with the image.</li> +</ul> +<h5>Disadvantages:</h5> +<ul> + <li>The <code>figure</code> and <code>figcaption</code> elements are not currently supported by browsers or assitive technology. </li> +</ul> +<p> </p> <h3>The <code>aria-labelledby</code> and <code>aria-describedby</code> attributes</h3> <p><span class="note">to do</span></p> +<h4>aria-describedby</h4> +<h5>Advantages:</h5> +<ul> + <li>Short and long text alternatives are explicitly associated with the image.</li> + <li>Long text alternative is available to all users.</li> +</ul> +<h5>Disadvantages:</h5> +<ul> + <li>Long text alternative takes up visual display space.</li> + <li>The explicit association using aria-describedby is not supported by some user agents and assistive technology.</li> +</ul> <h3>Text content within the same document or another document</h3> <p><span class="note">to do</span></p> +<h5> </h5> +<p> </p> <h3>Text content next to or prior to an image </h3> <p><span class="note">to do</span></p> +<h5>Advantages:</h5> +<ul> + <li>The text alternative is not repeated on and beside the image.</li> + <li>The text alternative is visible to all users.</li> + <li>The presenece of the image may not be reported to users.</li> +</ul> +<h5>Disadvantages:</h5> +<ul> + <li> Text alternative takes up visual display space.</li> + <li>The text laternative may not be explicitly associated with the image.</li> + <li>The presenece of the image may not be reported to users.</li> +</ul> +<p> </p> <h3>The <code>img</code> element <code>title</code> attribute</h3> <p><span class="note">to do</span></p> +<h5>Advantages:</h5> +<ul> + <li>The text alternative is explictly associated with the image for some users.</li> +</ul> +<h5>Disadvantages:</h5> +<ul> + <li> The display of the content of the title attribute is not displayed to users of most browsers when images are not supported or disabled.</li> + <li>The content of the title attribute is not available to users unless they can operate a mouse.</li> +</ul> +<p> </p> <h3>The <code>img</code> element <code>longdesc</code> attribute</h3> <p><span class="note">to do</span></p> +<h5>Advantages:</h5> +<ul> + <li>long text alternatives are explicitly associated with the image for users of assitive technology that supports <code>longdesc</code>.</li> +</ul> +<h5>Disadvantages:</h5> +<ul> + <li>Long text alternative is not available to all users.</li> + <li>The <code>longdesc</code> attribute is only supported by a limited number of brwosers and assitive technology.</li> + <li>The content of the page referenced by the<code> longdesc</code> is not available to all users.</li> +</ul> +<p> </p> <hr> <h2 id="recommendations">Requirements and Recommendations:</h2> <p>The requirements and recommendations for the <code title="attr-img-alt"><a href="#attr-img-alt">alt</a></code> attribute depend on what the image is intended to represent and the context in which it is used, as @@ -565,17 +622,7 @@ <p <strong>id="d2"</strong>>Figure 1. Distribution of Articles by Journal Category. Pie chart: Language=68%, Education=14% and Science=18%.</p></pre> - <h5>Advantages:</h5> - <ul> - <li>Short and long text alternatives are explicitly associated with the image.</li> - <li>Long text alternative is available to all users.</li> - </ul> - <h5>Disadvantages:</h5> - <ul> - <li>Long text alternative takes up visual display space.</li> - <li>The explicit association using aria-describedby is not supported by some user agents and assistive technology.</li> - <li>Users of assistive technology that support aria-describedby may have the long text alternative announced more than once</li> - </ul> + <h5> </h5> </div> <h4>Related techniques and resources</h4> <p><span class="note">to do</span></p>
Received on Tuesday, 13 April 2010 08:57:10 UTC