[css-values-4] Fix links, more highlighting.

Author: tabatkins

css-cascade-4/Overview.bs

@@ -322,14 +322,14 @@ Aliasing</h3>
 			except that the CSSOM will not use them
 			when serializing declarations. [[CSSOM]]
 
-			<div class=example>
+			<div class=example highlight=js>
 				For example, the 'page-break-*' properties
 				are <a>legacy shorthands</a> for the 'break-*' properties
 				(see [[css-break-3#page-break-properties]]).
 
-				Setting 'page-break-before: always' expands to 'break-before: page' at parse time,
+				Setting ''page-break-before: always'' expands to ''break-before: page'' at parse time,
 				like other shorthands do.
-				Similarly, if 'break-before: page' is set,
+				Similarly, if ''break-before: page'' is set,
 				calling <code>getComputedStyle(el).pageBreakBefore</code> will return <code>"always"</code>.
 				However, when serializing a style block
 				(see [[cssom-1#serializing-css-values]]),