[css-cascade] Update to allow dropping parens in <<supports-condition>> when it consists of only a single declaration per WG resolution <https://lists.w3.org/Archives/Public/www-style/2015Aug/0051.html>

Author: fantasai

css-cascade/Overview.bs

@@ -39,6 +39,17 @@ Introduction</h2>
 	The rules for finding the specified value for all properties on all elements in the document are described in this specification.
 	The rules for finding the specified values in the page context and its margin boxes are described in [[CSS3PAGE]].
 
+<h3 id="placement">
+Module Interactions</h3>
+
+	<p>This module replaces and extends
+	the rules for assigning property values, aascading, and inheritance defined in [[!CSS21]] chapter 6.
+
+	<p>Other CSS modules may expand the definitions of some of the syntax and features defined here.
+	For example, the Media Queries Level 4 specification,
+	when combined with this module, expands the definition of
+	the <<media-query>> value type as used in this specification.
+
 <h2 id="at-import">
 Importing Style Sheets: the ''@import'' rule</h2>
 
@@ -63,8 +74,12 @@ Importing Style Sheets: the ''@import'' rule</h2>
 	and the optional <<supports-condition>> and <<media-query-list>>
 	(collectively, the <dfn>import conditions</dfn>)
 	state the conditions under which it applies.
+	A <dfn><<media-query>></dfn> corresponds to the <code>media_query_list</code> production and is interpreted as a <a>media query</a>,
+	and a <dfn><<supports-condition>></dfn> corresponds to either a <code>supports_condition</code> production
+	or a <code>declaration</code> production interpreted as a <code>supports_declaration_condition</code> production
+	and is interpreted as an ''@supports'' condition.
 
-	Issue: Feedback on the <<supports-condition>> syntax is hereby solicited,
+	Issue: Feedback on the the <css>supports()</css> syntax is hereby solicited,
 	since none so far has been received.
 
 	If a <<string>> is provided,
@@ -86,9 +101,9 @@ Importing Style Sheets: the ''@import'' rule</h2>
 	(Specifying ''@media/all'' for the <<media-query-list>> has the same effect.)
 
 	The evaluation and full syntax of the <a>import conditions</a>
-	is defined by the <a href="http://www.w3.org/TR/css3-mediaqueries/">Media Queries</a> [[!MEDIAQ]]
+	are defined by the <a href="http://www.w3.org/TR/css3-mediaqueries/">Media Queries</a> [[!MEDIAQ]]
 	and <a href="http://www.w3.org/TR/css-conditional/">CSS Conditional Rules</a> [[!CSS3-CONDITIONAL]] specifications.
-	If the conditions do not match,
+	If the <a>import conditions</a> do not match,
 	the rules in the imported stylesheet do not apply,
 	exactly as if the imported stylesheet were wrapped in ''@media'' and/or ''@supports'' blocks with the given conditions.