[html5] r4558 - [t] (0) Discourage also auto-generating alt text from other sources that the bro [...]

[whatwg at whatwg.org]

Author: ianh
Date: 2010-01-10 05:55:26 -0800 (Sun, 10 Jan 2010)
New Revision: 4558

Modified:
   complete.html
   index
   source
Log:
[t] (0) Discourage also auto-generating alt text from other sources that the browsers also have access to.
Fixing http://www.w3.org/Bugs/Public/show_bug.cgi?id=8524

Modified: complete.html
===================================================================
--- complete.html	2010-01-10 11:45:49 UTC (rev 4557)
+++ complete.html	2010-01-10 13:55:26 UTC (rev 4558)
@@ -19426,8 +19426,17 @@
   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>
 
   <div class=impl>

Modified: index
===================================================================
--- index	2010-01-10 11:45:49 UTC (rev 4557)
+++ index	2010-01-10 13:55:26 UTC (rev 4558)
@@ -19291,8 +19291,17 @@
   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>
 
   <div class=impl>

Modified: source
===================================================================
--- source	2010-01-10 11:45:49 UTC (rev 4557)
+++ source	2010-01-10 13:55:26 UTC (rev 4558)
@@ -20599,10 +20599,19 @@
   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">
 
   <h6>Guidance for conformance checkers</h6>