[css2] did issue 165

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402406

Author: howcom

css2/generate.src

@@ -172,7 +172,9 @@ class="value-inst-string"><strong>&lt;string&gt;</strong></span></span>
 <dt><span class="index-inst" title="&lt;uri&gt;"><span
 class="value-inst-uri"><strong>&lt;uri&gt;</strong></span></span>
 <dd>The value is a URI that designates an external resource (such as an image).
-If a user agent cannot display the resource it must ignore it.
+If  the user agent cannot display the resource it must either leave
+it out as if it were not specified or display some indication that
+the resource cannot be displayed.
 
 <dt><span class="index-inst" title="&lt;counter&gt;"><span
 class="value-inst-counter"><strong>&lt;counter&gt;</strong></span></span>