[css2] CSS2.1 Issues 2:107 and 2:200; edits by howcome

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402317

Author: Hixie

css2/generate.src

@@ -165,7 +165,7 @@ 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.
+<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.
 
 <dt><span class="index-inst" title="&lt;counter&gt;"><span
@@ -525,11 +525,11 @@ H1 { counter-reset: section -1 imagenum 99 }
 <h3><a name="scope">Nested counters and scope</a></h3>
 
 <p>Counters are "self-nesting", in the sense that resetting a counter
-in a descendant element automatically creates a new instance of
-the counter. This is important for situations like lists in HTML,
-where elements can be nested inside themselves to arbitrary depth.
-It would be impossible to define uniquely named counters for each
-level.
+in a descendant element or pseudo-element automatically creates a new
+instance of the counter. This is important for situations like lists
+in HTML, where elements can be nested inside themselves to arbitrary
+depth. It would be impossible to define uniquely named counters for
+each level.
 
 <div class="example">
 <p>Thus, the following suffices to number nested list items. The