More unitless CSS properties

volume, stress, pitch-range, richness

src/dom/CSSProperty.js

@@ -27,6 +27,10 @@ var isUnitlessNumber = {
   lineHeight: true,
   opacity: true,
   orphans: true,
+  pitchRange: true,
+  richness: true,
+  stress: true,
+  volume: true,
   widows: true,
   zIndex: true,
   zoom: true

src/dom/__tests__/CSSPropertyOperations-test.js

@@ -77,10 +77,14 @@ describe('CSSPropertyOperations', function() {
       zIndex: 5,
       zoom: 6,
       lineHeight: 7,
-      widows: 8
+      widows: 8,
+      volume: 9,
+      stress: 10,
+      pitchRange: 11,
+      richness: 12
     })).toBe(
       'fill-opacity:1;font-weight:2;opacity:3;orphans:4;z-index:5;zoom:6;' +
-      'line-height:7;widows:8;'
+      'line-height:7;widows:8;volume:9;stress:10;pitch-range:11;richness:12;'
     );
   });