adjust link styling

Author: tabatkins

default.css

@@ -172,11 +172,17 @@ code.xml { color: #600 }	/* inline XML */
 [data-link-type="propdesc"]::before, 
 [data-link-type="descriptor"]::before, 
 [data-link-type="value"]::before, 
+[data-link-type="function"]::before, 
+[data-link-type="at-rule"]::before, 
+[data-link-type="selector"]::before, 
 [data-autolink="maybe"]::before {content: "\2018";}
 [data-link-type="property"]::after, 
 [data-link-type="propdesc"]::after, 
 [data-link-type="descriptor"]::after, 
 [data-link-type="value"]::after, 
+[data-link-type="function"]::after, 
+[data-link-type="at-rule"]::after, 
+[data-link-type="selector"]::after, 
 [data-autolink="maybe"]::after {content: "\2019";}
 
 dfn { font-weight: bolder; }