[c] (0) alt='' is required, more or less... conformance checkers can …

…say so, anyway (credit: sp) (bug: 6494) git-svn-id: http://svn.whatwg.org/webapps@2951 340c8d12-0b0e-0410-8428-c7bf67bfef74
whatwg · Apr 1, 2009 · d31b7c4 · d31b7c4
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diff --git a/index b/index
@@ -458,7 +458,8 @@
          <li><a href=#an-image-not-intended-for-the-user><span class=secno>4.8.2.1.10 </span>An image not intended for the user</a></li>
          <li><a href=#an-image-in-an-e-mail-or-document-intended-for-a-specific-person-who-is-known-to-be-able-to-view-images><span class=secno>4.8.2.1.11 </span>An image in an e-mail or document intended for a specific person who is known to be able to view images</a></li>
          <li><a href=#general-guidelines><span class=secno>4.8.2.1.12 </span>General guidelines</a></li>
-         <li><a href=#guidance-for-markup-generators><span class=secno>4.8.2.1.13 </span>Guidance for markup generators</a></ol></ol></li>
+         <li><a href=#guidance-for-markup-generators><span class=secno>4.8.2.1.13 </span>Guidance for markup generators</a></li>
+         <li><a href=#guidance-for-conformance-checkers><span class=secno>4.8.2.1.14 </span>Guidance for conformance checkers</a></ol></ol></li>
      <li><a href=#the-iframe-element><span class=secno>4.8.3 </span>The <code>iframe</code> element</a></li>
      <li><a href=#the-embed-element><span class=secno>4.8.4 </span>The <code>embed</code> element</a></li>
      <li><a href=#the-object-element><span class=secno>4.8.5 </span>The <code>object</code> element</a></li>
@@ -17597,7 +17598,7 @@ of various sizes."&gt;</strong></pre>
    </dd>
 
 
-   <dt>Images whose contents are not known</dt>
+   <dt id=unknown-images>Images whose contents are not known</dt>
 
    <dd>
 
@@ -17820,6 +17821,18 @@ href="?audio"&gt;audio&lt;/a&gt; test instead.)&lt;/p&gt;</pre>
 
   </div>
 
+  <div class=impl>
+
+  <h6 id=guidance-for-conformance-checkers><span class=secno>4.8.2.1.14 </span>Guidance for conformance checkers</h6>
+
+  <p>Conformance checkers must report the lack of an <code title=attr-img-alt><a href=#attr-img-alt>alt</a></code> attribute as an error unless the
+  conditions listed above for <a href=#unknown-images>images whose
+  contents are not known</a> or they have been configured to assume
+  that the document is an e-mail or document intended for a specific
+  person who is known to be able to view images.</p>
+
+  </div>
+
 
 
   <h4 id=the-iframe-element><span class=secno>4.8.3 </span>The <dfn><code>iframe</code></dfn> element</h4>

diff --git a/source b/source
@@ -18876,7 +18876,7 @@ of various sizes."></strong></pre>
    </dd>
 
 
-   <dt>Images whose contents are not known</dt>
+   <dt id="unknown-images">Images whose contents are not known</dt>
 
    <dd>
 
@@ -19116,6 +19116,19 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
 
   </diV>
 
+  <div class="impl">
+
+  <h6>Guidance for conformance checkers</h6>
+
+  <p>Conformance checkers must report the lack of an <code
+  title="attr-img-alt">alt</code> attribute as an error unless the
+  conditions listed above for <a href="#unknown-images">images whose
+  contents are not known</a> or they have been configured to assume
+  that the document is an e-mail or document intended for a specific
+  person who is known to be able to view images.</p>
+
+  </div>
+
 
 
   <h4>The <dfn><code>iframe</code></dfn> element</h4>