[css-lists] Handle ol[reversed][value].

Author: tabatkins

css-lists/Overview.html

@@ -1270,8 +1270,9 @@ <h2 class="heading settled heading" data-level=10 id=ua-stylesheet><span class=s
 
   /* Handling reversed lists */
   ol[reversed] {
-    /* Do a counter-reset for one greater than
-       the number of child &lt;li&gt; elements */
+    counter-reset: list-item attr(start integer, **magic**);
+    /* Where **magic** is the number of child &lt;li&gt; elements. */
+    counter-increment: list-item 1;
   }
   ol[reversed] &gt; li {
     counter-increment: list-item -1;

css-lists/Overview.src.html

@@ -1308,8 +1308,9 @@ <h2 id='ua-stylesheet'>
 
 		/* Handling reversed lists */
 		ol[reversed] {
-			/* Do a counter-reset for one greater than
-			   the number of child &lt;li> elements */
+			counter-reset: list-item attr(start integer, **magic**);
+			/* Where **magic** is the number of child &lt;li> elements. */
+			counter-increment: list-item 1;
 		}
 		ol[reversed] > li {
 			counter-increment: list-item -1;