Fix grammar leniency in background-position http://lists.w3.org/Archives/Public/www-style/2010Jan/0155.html

Author: fantasai

css3-background/Overview.html

@@ -954,10 +954,12 @@ <h3 id=the-background-position><span class=secno>3.6. </span>The
 
   <pre
    class=prod><dfn id=ltbg-positiongt><var>&lt;bg-position&gt;</var></dfn> = [
-  [ [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | left | center | right ] ]
-  [ [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | top | center | bottom ] ]?
+  [ top | bottom ]
 |
-  [ center | [ left | right ] [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> ]? ] ||
+  [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | left | center | right ]
+  [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | top | center | bottom ]?
+|
+  [ center | [ left | right ] [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> ]? ] &amp;&amp;
   [ center | [ top | bottom ] [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> ]? ]
 ]</pre>
 

css3-background/Overview.src.html

@@ -603,10 +603,12 @@ <h3 id="the-background-position">The 'background-position' property</h3>
 
 <p>Where
 <pre class=prod><dfn><var>&lt;bg-position&gt;</var></dfn> = [
-  [ [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | left | center | right ] ]
-  [ [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | top | center | bottom ] ]?
+  [ top | bottom ]
 |
-  [ center | [ left | right ] [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> ]? ] ||
+  [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | left | center | right ]
+  [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> | top | center | bottom ]?
+|
+  [ center | [ left | right ] [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> ]? ] &amp;&amp;
   [ center | [ top | bottom ] [ <var>&lt;percentage&gt;</var> | <var>&lt;length&gt;</var> ]? ]
 ]</pre>