disallow trailing slashes in border-image shorthand (as originally intended <http://lists.w3.org/Archives/Public/www-style/2012Mar/0179.html>

Author: fantasai

css3-background/Overview.html

@@ -3677,9 +3677,11 @@ <h3 id=the-border-image><span class=secno>6.7. </span>Border Image
       <var>&lt;&lsquo;<a href="#border-image-slice"><code
       class=property>border-image-slice</code></a>&rsquo;&gt;</var> [ /
       <var>&lt;&lsquo;<a href="#border-image-width"><code
-      class=property>border-image-width</code></a>&rsquo;&gt;</var>? [ /
+      class=property>border-image-width</code></a>&rsquo;&gt;</var> | /
+      <var>&lt;&lsquo;<a href="#border-image-width"><code
+      class=property>border-image-width</code></a>&rsquo;&gt;</var>? /
       <var>&lt;&lsquo;<a href="#border-image-outset"><code
-      class=property>border-image-outset</code></a>&rsquo;&gt;</var> ]? ]? ||
+      class=property>border-image-outset</code></a>&rsquo;&gt;</var> ]? ||
       <var>&lt;&lsquo;<a href="#border-image-repeat"><code
       class=property>border-image-repeat</code></a>&rsquo;&gt;</var>
 
@@ -4958,8 +4960,9 @@ <h2 class=no-num id=property-index> Property Index</h2>
 
      <td>&lt;&lsquo;border-image-source&rsquo;&gt; ||
       &lt;&lsquo;border-image-slice&rsquo;&gt; [ /
-      &lt;&lsquo;border-image-width&rsquo;&gt;? [ /
-      &lt;&lsquo;border-image-outset&rsquo;&gt; ]? ]? ||
+      &lt;&lsquo;border-image-width&rsquo;&gt; | /
+      &lt;&lsquo;border-image-width&rsquo;&gt;? /
+      &lt;&lsquo;border-image-outset&rsquo;&gt; ]? ||
       &lt;&lsquo;border-image-repeat&rsquo;&gt;
 
      <td>See individual properties

css3-background/Overview.src.html

@@ -2632,8 +2632,8 @@ <h3 id="the-border-image">Border Image Shorthand: the 'border-image' property</h
     <th><a href="#values">Value</a>:
     <td>   <var>&lt;'border-image-source'&gt;</var>
         || <var>&lt;'border-image-slice'&gt;</var>
-           [ / <var>&lt;'border-image-width'&gt;</var>?
-             [ / <var>&lt;'border-image-outset'&gt;</var> ]? ]?
+           [ / <var>&lt;'border-image-width'&gt;</var> |
+             / <var>&lt;'border-image-width'&gt;</var>? / <var>&lt;'border-image-outset'&gt;</var> ]?
         || <var>&lt;'border-image-repeat'&gt;</var>
   <tr>
     <th>Initial: