[] (0) Make it clearer that the optional icon doesn't make sense in p…

…lain text

Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=21403
Affected topics: Rendering

git-svn-id: http://svn.whatwg.org/webapps@7855 340c8d12-0b0e-0410-8428-c7bf67bfef74

complete.html

@@ -93898,7 +93898,9 @@ <h4 id=images-0><span class=secno>14.4.2 </span>Images</h4>
 
   <p>When an <code><a href=#the-img-element>img</a></code> element <a href=#represents>represents</a> some text and the user agent does not
   expect this to change, the element is expected to be treated as a non-replaced phrasing element
-  whose content is the text, optionally with an icon indicating that an image is missing.</p>
+  whose content is the text, optionally with an icon indicating that an image is missing, so that
+  the user can request the image be displayed or investigate why it is not rendering. In
+  non-graphical contexts, such an icon should be omitted.</p>
 
   <p>When an <code><a href=#the-img-element>img</a></code> element <a href=#represents>represents</a> nothing and the user agent does not
   expect this to change, the element is expected to not be rendered at all.</p>

index

@@ -93898,7 +93898,9 @@ iframe[seamless] { display: block; }
 
   <p>When an <code><a href=#the-img-element>img</a></code> element <a href=#represents>represents</a> some text and the user agent does not
   expect this to change, the element is expected to be treated as a non-replaced phrasing element
-  whose content is the text, optionally with an icon indicating that an image is missing.</p>
+  whose content is the text, optionally with an icon indicating that an image is missing, so that
+  the user can request the image be displayed or investigate why it is not rendering. In
+  non-graphical contexts, such an icon should be omitted.</p>
 
   <p>When an <code><a href=#the-img-element>img</a></code> element <a href=#represents>represents</a> nothing and the user agent does not
   expect this to change, the element is expected to not be rendered at all.</p>

source

@@ -104980,7 +104980,9 @@ iframe[seamless] { display: block; }
 
   <p>When an <code>img</code> element <span>represents</span> some text and the user agent does not
   expect this to change, the element is expected to be treated as a non-replaced phrasing element
-  whose content is the text, optionally with an icon indicating that an image is missing.</p>
+  whose content is the text, optionally with an icon indicating that an image is missing, so that
+  the user can request the image be displayed or investigate why it is not rendering. In
+  non-graphical contexts, such an icon should be omitted.</p>
 
   <p>When an <code>img</code> element <span>represents</span> nothing and the user agent does not
   expect this to change, the element is expected to not be rendered at all.</p>