[css-contain-3] Clarify syntax of the @container rule for proper handling of parenthesis

Author: mirisuzanne

css-contain-3/Overview.bs

@@ -565,30 +565,30 @@ Container Queries: the ''@container'' rule</h3>
 	to only match when the [=container query=]
 	is true for their element’s [=query container=].
 
-
 	The syntax of the ''@container'' rule is:
 
 	<pre class="prod def">
-	@container [ <<container-name>> ]? <<container-query>> {
-	    <<stylesheet>>
+	@container [ <<container-name>> ]? <<container-condition>> {
+	  <<stylesheet>>
 	}
 	</pre>
 
 	where:
 
 	<pre class="prod def">
-	<dfn><<container-query>></dfn>     = ( <<container-condition>> )
+	<dfn><<container-condition>></dfn> = not <<query-in-parens>>
+	                      | <<query-in-parens>> [ [ and <<query-in-parens>> ]* | [ or <<query-in-parens>> ]* ]
+	<dfn><<query-in-parens>></dfn>     = ( <<container-condition>> )
 	                      | ( <<size-feature>> )
 	                      | style( <<style-query>> )
 	                      | <<general-enclosed>>
-	<dfn><<container-condition>></dfn> = not <<container-query>>
-	                      | <<container-query>> [ and <<container-query>> ]*
-	                      | <<container-query>> [ or <<container-query>> ]*
-
-	<dfn><<style-query>></dfn>     = <<style-feature>> | <<style-condition>>
-	<dfn><<style-condition>></dfn> = not ( <<style-query>> )
-	                  | ( <<style-query>> ) [ and ( <<style-query>> ) ]*
-	                  | ( <<style-query>> ) [ or  ( <<style-query>> ) ]*
+
+	<dfn><<style-query>></dfn>         = <<style-condition>> | <<style-feature>>
+	<dfn><<style-condition>></dfn>     = not <<style-in-parens>>
+	                      | <<style-in-parens>> [ [ and <<style-in-parens>> ]* | [ or <<style-in-parens>> ]* ]
+	<dfn><<style-in-parens>></dfn>     = ( <<style-condition>> )
+	                      | ( <<style-feature>> )
+	                      | <<general-enclosed>>
 	</pre>
 
 
@@ -1012,6 +1012,8 @@ Changes since the 21 December 2021 First Public Working Draft</h3>
 
 	Significant changes since the <a href="https://www.w3.org/TR/2021/WD-css-contain-3-20211221/">21 December 2021 First Public Working Draft</a> include:
 
+	* Clarify the syntax of syntax of the ''@container'' rule
+		to appropriately handle parenthesis.
 	* Remove the <<string>> option from the 'container-name' syntax.
 		Container names must be <<custom-ident>>s.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/6405">Issue 6405</a>)