[t] (0) Discourage also auto-generating alt text from other sources t…

…hat the browsers also have access to. Fixing http://www.w3.org/Bugs/Public/show_bug.cgi?id=8524 git-svn-id: http://svn.whatwg.org/webapps@4558 340c8d12-0b0e-0410-8428-c7bf67bfef74
whatwg · Jan 10, 2010 · 8fa9fd8 · 8fa9fd8
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diff --git a/complete.html b/complete.html
@@ -19426,7 +19426,16 @@ <h6 id=guidance-for-markup-generators><span class=secno>4.8.2.1.13 </span>Guidan
   content.</p>
 
   <p>Markup generators should generally avoid using the image's own
-  file name as the alternative text.</p>
+  file name as the alternative text. Similarly, markup generators
+  should avoid generating alternative text from any content that will
+  be equally available to presentation user agents (e.g. Web
+  browsers).</p>
+
+  <p class=note>This is because once a page is generated, it will
+  typically not be updated, whereas the browsers that later read the
+  page can be updated by the user, therefore the browser is likely to
+  have more up-to-date and finely-tuned heuristics than the markup
+  generator did when generating the page.</p>
 
   </div>
 

diff --git a/index b/index
@@ -19291,7 +19291,16 @@ href="?audio"&gt;audio&lt;/a&gt; test instead.)&lt;/p&gt;</pre>
   content.</p>
 
   <p>Markup generators should generally avoid using the image's own
-  file name as the alternative text.</p>
+  file name as the alternative text. Similarly, markup generators
+  should avoid generating alternative text from any content that will
+  be equally available to presentation user agents (e.g. Web
+  browsers).</p>
+
+  <p class=note>This is because once a page is generated, it will
+  typically not be updated, whereas the browsers that later read the
+  page can be updated by the user, therefore the browser is likely to
+  have more up-to-date and finely-tuned heuristics than the markup
+  generator did when generating the page.</p>
 
   </div>
 

diff --git a/source b/source
@@ -20599,9 +20599,18 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
   content.</p>
 
   <p>Markup generators should generally avoid using the image's own
-  file name as the alternative text.</p>
+  file name as the alternative text. Similarly, markup generators
+  should avoid generating alternative text from any content that will
+  be equally available to presentation user agents (e.g. Web
+  browsers).</p>
 
-  </diV>
+  <p class="note">This is because once a page is generated, it will
+  typically not be updated, whereas the browsers that later read the
+  page can be updated by the user, therefore the browser is likely to
+  have more up-to-date and finely-tuned heuristics than the markup
+  generator did when generating the page.</p>
+
+  </div>
 
   <div class="impl">