[css-content-3] Improve section titles.

Author: fantasai

css-content-3/Overview.bs

@@ -95,7 +95,7 @@ Value Definitions</h3>
 	For readability they have not been repeated explicitly.
 
 <h2 id="content-property">
-Inserting and replacing content with the 'content' property</h2>
+Inserting and Replacing Content: the 'content' property</h2>
 
 	<pre class='propdef'>
 		Name: content
@@ -178,12 +178,6 @@ Inserting and replacing content with the 'content' property</h2>
 
 		<dt><dfn type><<content-list>></dfn>
 		<dd>
-			Equal to:
-
-			<pre class=prod>
-			[ <<string>> | <<image>> | <<attr()>> | contents | <<quote>> | <<leader()>> | <<target>> | <<string()>> | <<content()>> | <<counter>> ]+
-			</pre>
-
 			Replaces the element's contents with one or more anonymous inline boxes
 			corresponding to the specified values,
 			in the order specified.
@@ -270,16 +264,20 @@ Alternative Text for Accessibility</h3>
 	<!--end copy from CSS-PSEUDO-->
 
 <h2 id="content-values">
-<<content-list>> Values and Functions</h2>
+Generated Content Values: the <<content-list>> type</h2>
 
 	The <<content-list>> value is used in 'content'
 	to fill an element with one or more anonymous inline boxes,
 	including images, strings, the values of counters, and the text value of elements.
 	In this section we enumerate the possibilities.
 
+	The syntax of <<content-list>> is defined as:
+	<pre class=prod>
+		<<content-list>> = [ <<string>> | <<image>> | <<attr()>> | contents | <<quote>> | <<leader()>> | <<target>> | <<string()>> | <<content()>> | <<counter>> ]+
+	</pre>
 
 <h3 id="strings">
-Basic Strings: <<string>> and <<attr()>></h3>
+Basic Strings: <<string>> and <<attr()>> values</h3>
 
 	<dl dfn-for="content, <content-list>" dfn-type=value>
 		<dt><dfn><<string>></dfn>
@@ -308,7 +306,7 @@ Basic Strings: <<string>> and <<attr()>></h3>
 	</dl>
 
 <h3 id="content-uri">
-<<image>></h3>
+2D Images: <<image>> values</h3>
 
 	<dl dfn-type=value dfn-for="<content-list>">
 		<dt><dfn><<image>></dfn></dt>
@@ -329,7 +327,7 @@ Basic Strings: <<string>> and <<attr()>></h3>
 
 
 <h3 id="element-content">
-Element Content</h3>
+Elemental Content: the ''contents'' keyword</h3>
 
 	<dl dfn-for="content, <content-list>" dfn-type=value>
 		<dt><dfn>contents</dfn>
@@ -392,7 +390,7 @@ Element Content</h3>
 
 
 <h3 id="quotes">
-Quotes</h3>
+Quotation Marks</h3>
 
 	The ''quotes'' property, which defines the [=quotation mark system=] of an
 	 element,
@@ -402,7 +400,7 @@ Quotes</h3>
 	such as for the HTML <{q}> element.
 
 <h4 id="quotes-property">
-Specifying quotes with the 'quotes' property</h4>
+Quotation Mark System: the 'quotes' property</h4>
 
 	<pre class='propdef'>
 		Name: quotes
@@ -468,7 +466,7 @@ Specifying quotes with the 'quotes' property</h4>
 	</dl>
 
 <h4 id="quote-values">
-The *-quote values of the content property</h4>
+Inserting Quotation Marks: the ''*-quote'' keywords</h4>
 
 	<pre class="prod">
 		<dfn><<quote>></dfn> = open-quote | close-quote | no-open-quote | no-close-quote
@@ -799,7 +797,7 @@ Procedure for rendering leaders</h4>
 
 
 <h3 id="cross-references">
-Cross references and the target-* functions</h3>
+Cross References</h3>
 
 	Many documents contain internal references:
 
@@ -947,7 +945,7 @@ The ''target-text()'' function</h4>
 
 
 <h3 id="named-strings">
-Named strings</h3>
+Named Strings</h3>
 
 	This section introduces <dfn lt="named string">named strings</dfn>,
 	which are the textual equivalent of counters
@@ -991,7 +989,7 @@ Named strings</h3>
 
 
 <h4 id="string-set">
-The string-set property</h4>
+Naming Strings: the 'string-set' property</h4>
 
 	<pre class="propdef">
 	Name: string-set
@@ -1046,7 +1044,7 @@ The string-set property</h4>
 
 
 <h4 id="string-function">
-The ''string()'' function</h4>
+Inserting Named Strings: the ''string()'' function</h4>
 
 	<pre class="prod">
 		<dfn>string()</dfn> = string( <<custom-ident>> , [ first | start | last | first-except ]? )
@@ -1206,9 +1204,9 @@ The ''content()'' function</h4>
 
 
 <h2 id="counters">
-Automatic counters and numbering: the 'counter-increment' and 'counter-reset' properties (moved)</h2>
+Automatic Counters and Numbering</h2>
 
-	Issue: Now described in [[CSS3LIST]]
+	See [[!CSS-LISTS-3]].
 
 	Issue: Should this move back to CSS Content?
 
@@ -1234,7 +1232,7 @@ Bookmarks</h2>
 	must have no effect on descendants of the element.
 
 <h3 id="bookmark-level">
-bookmark-level
+Setting a Bookmark: the 'bookmark-level' property
 </h3>
 
 	The 'bookmark-level' property determines if a bookmark is created,
@@ -1276,7 +1274,7 @@ bookmark-level
 
 
 <h3 id="bookmark-label">
-bookmark-label</h3>
+Labelling a Bookmark: the 'bookmark-label' property</h3>
 
 	<pre class="propdef">
 	Name: bookmark-label
@@ -1319,7 +1317,7 @@ bookmark-label</h3>
 	</div>
 
 <h3 id="bookmark-state">
-bookmark-state</h3>
+Initial Bookmark Toggle State: the 'bookmark-state' property</h3>
 
 	The 'bookmark-state' may be open or closed. The user must be able to toggle the bookmark state.