[css3-syntax] Make it possible to have a style rule with an empty selector.

Author: tabatkins

css3-syntax/Overview.html

@@ -2906,9 +2906,9 @@ <h4 id=top-level-mode><span class=secno>5.3.1. </span> <dfn
 
    <dt>{ token
 
-   <dd> This is a <i>parse error</i>. <a
-    href="#consume-a-primitive0"><i>Consume a primitive</i></a> and ignore
-    the return value. Remain in this state.
+   <dd> Create a style rule and push it onto the <a
+    href="#stack-of-open-rules"><i>stack of open rules</i></a>. Switch to the
+    <a href="#declaration-block-mode0"><i>declaration-block mode</i></a>.
 
    <dt>EOF token
 
@@ -3012,9 +3012,9 @@ <h4 id=rule-block-mode><span class=secno>5.3.3. </span> <dfn
 
    <dt>{ token
 
-   <dd> This is a <i>parse error</i>. <a
-    href="#consume-a-primitive0"><i>Consume a primitive</i></a> and ignore
-    the return value. Remain in this state.
+   <dd> Create a style rule and push it onto the <a
+    href="#stack-of-open-rules"><i>stack of open rules</i></a>. Switch to the
+    <a href="#declaration-block-mode0"><i>declaration-block mode</i></a>.
 
    <dt>} token
 

css3-syntax/Overview.src.html

@@ -2385,10 +2385,9 @@ <h4>
 
 		<dt>{ token
 		<dd>
-			This is a <i>parse error</i>.
-			<i>Consume a primitive</i>
-			and ignore the return value.
-			Remain in this state.
+			Create a style rule 
+			and push it onto the <i>stack of open rules</i>.
+			Switch to the <i>declaration-block mode</i>.
 
 		<dt>EOF token
 		<dd>
@@ -2492,10 +2491,9 @@ <h4>
 
 		<dt>{ token
 		<dd>
-			This is a <i>parse error</i>.
-			<i>Consume a primitive</i>
-			and ignore the return value.
-			Remain in this state.
+			Create a style rule 
+			and push it onto the <i>stack of open rules</i>.
+			Switch to the <i>declaration-block mode</i>.
 
 		<dt>} token
 		<dd>