[cssom] Make 'insert a CSS rule' not insert invalid rules. https://www.w3.org/Bugs/Public/show_bug.cgi?id=22769

Author: Simon Pieters

cssom/Overview.html

@@ -16,7 +16,7 @@
  <h1>CSS Object Model (CSSOM)</h1>
 
 
- <h2 class="no-num no-toc" id="w3c-doctype">Editor's Draft 23 August 2013</h2>
+ <h2 class="no-num no-toc" id="w3c-doctype">Editor's Draft 26 August 2013</h2>
 
  <dl>
 
@@ -90,7 +90,7 @@ <h2 class="no-num no-toc" id="sotd">Status of This Document</h2>
 can be found in the
 <a href="http://www.w3.org/TR/">W3C technical reports index at http://www.w3.org/TR/.</a></em>
 
-<p class="dontpublish">This is the 23 August 2013 Editor's Draft of CSSOM. Please send comments to
+<p class="dontpublish">This is the 26 August 2013 Editor's Draft of CSSOM. Please send comments to
 <a href="mailto:www-style@w3.org?subject=%5Bcssom%5D%20">www-style@w3.org</a>
 (<a href="http://lists.w3.org/Archives/Public/www-style/">archived</a>)
 with <samp>[cssom]</samp> at the start of the subject line.
@@ -1802,6 +1802,8 @@ <h3 id="css-rules"><span class="secno">6.4 </span>CSS Rules</h3>
  on argument <var>rule</var>.
  <li><p>If <var>new rule</var> is a syntax error, <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#concept-throw" title="concept-throw">throw</a>
  a <code class="external" data-anolis-spec="dom"><a href="http://dom.spec.whatwg.org/#syntaxerror">SyntaxError</a></code> exception.</li>
+ <li><p>Parse <var>new rule</var> according to the appropriate CSS specifications, dropping parts that are said to be ignored. If the whole style rule is
+ dropped, <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#concept-throw" title="concept-throw">throw</a> a <code class="external" data-anolis-spec="dom"><a href="http://dom.spec.whatwg.org/#syntaxerror">SyntaxError</a></code> exception.
  <li><p>If <var>new rule</var> is an <code title="">@charset</code> at-rule, <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#concept-throw" title="concept-throw">throw</a> a
  <code class="external" data-anolis-spec="dom"><a href="http://dom.spec.whatwg.org/#syntaxerror">SyntaxError</a></code> exception.
  <li><p>Set <var>length</var> to the number of items in <var>list</var>.</li>

cssom/Overview.src.html

@@ -1723,6 +1723,8 @@ <h3>CSS Rules</h3>
  on argument <var>rule</var>.
  <li><p>If <var>new rule</var> is a syntax error, <span data-anolis-spec='dom' title='concept-throw'>throw</span>
  a <code data-anolis-spec='dom'>SyntaxError</code> exception.</p></li>
+ <li><p>Parse <var>new rule</var> according to the appropriate CSS specifications, dropping parts that are said to be ignored. If the whole style rule is
+ dropped, <span data-anolis-spec='dom' title='concept-throw'>throw</span> a <code data-anolis-spec='dom'>SyntaxError</code> exception.
  <li><p>If <var>new rule</var> is an <code title>@charset</code> at-rule, <span data-anolis-spec='dom' title='concept-throw'>throw</span> a
  <code data-anolis-spec='dom'>SyntaxError</code> exception.
  <li><p>Set <var>length</var> to the number of items in <var>list</var>.</p></li>