[cssom] Suggest that browsers remove support for the dashed IDL attributes.

Author: Simon Pieters

cssom/Overview.html

@@ -2269,7 +2269,7 @@ <h4 id="the-cssstyledeclaration-interface"><span class="secno">6.5.1 </span>The
 is obtained by running the <a href="#css-property-to-idl-attribute">CSS property to IDL attribute</a> algorithm for
 <var>property</var>.</p>
 
-<pre class="idl">partial interface <a href="#cssstyledeclaration">CSSStyleDeclaration</a> {
+<pre class="idl extract">partial interface <a href="#cssstyledeclaration">CSSStyleDeclaration</a> {
            attribute DOMString _<a href="#dom-cssstyledeclaration-camel-cased-attribute" title="dom-CSSStyleDeclaration-camel-cased-attribute"><var title="">camel-cased attribute</var></a>;
 };</pre>
 
@@ -2308,6 +2308,9 @@ <h4 id="the-cssstyledeclaration-interface"><span class="secno">6.5.1 </span>The
 
 <p class="note">WebIDL does not allow dashes in identifiers in its syntax.
 
+<p class="XXX">The <code title="dom-CSSStyleDeclaration-dashed-attribute"><a href="#dom-cssstyledeclaration-dashed-attribute"><var title="">dashed attribute</var></a></code> attributes will be removed from the specification
+if implementations remove support. User agents that currently support them are urged to experiment with removing support.
+
 <p>The <dfn id="css-property-to-idl-attribute">CSS property to IDL attribute</dfn> algorithm for <var title="">property</var> is as
 follows:</p>
 

cssom/Overview.src.html

@@ -2200,7 +2200,7 @@ <h4>The <code title>CSSStyleDeclaration</code> Interface</h4>
 is obtained by running the <span>CSS property to IDL attribute</span> algorithm for
 <var>property</var>.</p>
 
-<pre class=idl>partial interface <span>CSSStyleDeclaration</span> {
+<pre class="idl extract">partial interface <span>CSSStyleDeclaration</span> {
            attribute DOMString _<span title=dom-CSSStyleDeclaration-camel-cased-attribute><var title>camel-cased attribute</var></span>;
 };</pre>
 
@@ -2239,6 +2239,9 @@ <h4>The <code title>CSSStyleDeclaration</code> Interface</h4>
 
 <p class=note>WebIDL does not allow dashes in identifiers in its syntax.
 
+<p class=XXX>The <code title=dom-CSSStyleDeclaration-dashed-attribute><var title>dashed attribute</var></code> attributes will be removed from the specification
+if implementations remove support. User agents that currently support them are urged to experiment with removing support.
+
 <p>The <dfn>CSS property to IDL attribute</dfn> algorithm for <var title>property</var> is as
 follows:</p>