[css-syntax] Add Changes since the 2013-09-19 WD.

Author: SimonSapin

css-syntax/Overview.html

@@ -126,7 +126,9 @@ <h2 class="no-num no-toc no-ref heading settled heading" id=contents><span class
 The <span class=css data-link-type=maybe title=@charset>@charset</span> Rule</a></ul><li><a href=#serialization><span class=secno>9</span>
 Serialization</a><ul class=toc><li><a href=#serializing-anb><span class=secno>9.1</span>
 Serializing <var>&lt;an+b&gt;</var></a></ul><li><a href=#changes><span class=secno>10</span>
-Changes from CSS 2.1 and Selectors Level 3</a><li><a href=#acknowledgments><span class=secno></span>
+Changes</a><ul class=toc><li><a href=#changes-WD-20130919><span class=secno>10.1</span>
+Changes from the 19 September 2013 Working Draft</a><li><a href=#changes-css21><span class=secno>10.2</span>
+Changes from CSS 2.1 and Selectors Level 3</a></ul><li><a href=#acknowledgments><span class=secno></span>
 Acknowledgments</a><li><a href=#conformance><span class=secno></span>
 Conformance</a><ul class=toc><li><a href=#conventions><span class=secno></span>
 Document conventions</a><li><a href=#conformance-classes><span class=secno></span>
@@ -4520,10 +4522,23 @@ <h3 class="heading settled heading" data-level=9.1 id=serializing-anb><span clas
 <p>		Return <var>s</var>.
 
 <h2 class="heading settled heading" data-level=10 id=changes><span class=secno>10 </span><span class=content>
-Changes from CSS 2.1 and Selectors Level 3</span><a class=self-link href=#changes></a></h2>
+Changes</span><a class=self-link href=#changes></a></h2>
 
 <p>	<em>This section is non-normative.</em>
 
+<h3 class="heading settled heading" data-level=10.1 id=changes-WD-20130919><span class=secno>10.1 </span><span class=content>
+Changes from the 19 September 2013 Working Draft</span><a class=self-link href=#changes-WD-20130919></a></h3>
+
+<p>	<ul>
+		<li>
+			The concept of <a data-link-type=dfn href=#environment-encoding0 title="environment encoding">environment encoding</a> was added.
+			The behavior does not change,
+			but some of the definitions should be moved to the relevant specs.
+	</ul>
+
+<h3 class="heading settled heading" data-level=10.2 id=changes-css21><span class=secno>10.2 </span><span class=content>
+Changes from CSS 2.1 and Selectors Level 3</span><a class=self-link href=#changes-css21></a></h3>
+
 <p class=note>	Note: The point of this spec is to match reality;
 	changes from CSS2.1 are nearly always because CSS 2.1 specified something that doesn’t match actual browser behavior,
 	or left something unspecified.

css-syntax/Overview.src.html

@@ -3043,10 +3043,23 @@ <h3 id='serializing-anb'>
 		Return <var>s</var>.
 
 <h2 id="changes">
-Changes from CSS 2.1 and Selectors Level 3</h2>
+Changes</h2>
 
 	<em>This section is non-normative.</em>
 
+<h3 id="changes-WD-20130919">
+Changes from the 19 September 2013 Working Draft</h3>
+
+	<ul>
+		<li>
+			The concept of <a>environment encoding</a> was added.
+			The behavior does not change,
+			but some of the definitions should be moved to the relevant specs.
+	</ul>
+
+<h3 id="changes-css21">
+Changes from CSS 2.1 and Selectors Level 3</h3>
+
 	Note: The point of this spec is to match reality;
 	changes from CSS2.1 are nearly always because CSS 2.1 specified something that doesn't match actual browser behavior,
 	or left something unspecified.