bug 1020143 - prefer tabular numerals for list numbering. r=jdaggett

layout/reftests/counters/counter-suffix-ref.html

@@ -7,6 +7,8 @@
     width: 3em;
     text-align: end;
     box-sizing: border-box;
+    -moz-font-feature-settings: "tnum"; /* to match ua.css, see bug 1020143 */
+    font-feature-settings: "tnum";
   }
 </style>
 <div id="wrapper">

layout/style/ua.css

@@ -77,6 +77,10 @@
 *|*::-moz-list-bullet, *|*::-moz-list-number {
   display: inline;
   vertical-align: baseline;
+  /* TODO: Replace this with font-variant-numeric:tabular-nums once the
+     font-variant-* properties are enabled for all channels (bug 975744). */
+  -moz-font-feature-settings: "tnum";
+  font-feature-settings: "tnum";
 }
 
 /* Links */