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steve: updated alt technique methods with advantages and disadvantages for most methods.

From: poot <cvsmail@w3.org>
Date: Tue, 13 Apr 2010 17:57:16 +0900 (JST)
To: public-html-diffs@w3.org
Message-Id: <20100413085716.5B67F2BC26@toro.w3.mag.keio.ac.jp>
steve: updated alt technique methods with advantages and disadvantages
for most methods.

http://dev.w3.org/cvsweb/html5/alt-techniques/Overview.html?r1=1.8&r2=1.9&f=h

===================================================================
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>&nbsp;</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>&nbsp;</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>&nbsp;</h5>
+<p>&nbsp;</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>&nbsp;</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>&nbsp;</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>&nbsp;</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 @@
 &lt;p <strong>id=&quot;d2&quot;</strong>&gt;Figure 1. Distribution of Articles by Journal Category. 
 Pie chart: Language=68%, Education=14% and Science=18%.&lt;/p&gt;</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>&nbsp;</h5>
 </div>
 <h4>Related  techniques and resources</h4>
 <p><span class="note">to do</span></p>
Received on Tuesday, 13 April 2010 08:57:44 GMT

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