Add strokeOpacity to unitless CSS properties

src/browser/ui/dom/CSSProperty.js

@@ -16,7 +16,6 @@
  */
 var isUnitlessNumber = {
   columnCount: true,
-  fillOpacity: true,
   flex: true,
   flexGrow: true,
   flexShrink: true,
@@ -28,7 +27,11 @@ var isUnitlessNumber = {
   orphans: true,
   widows: true,
   zIndex: true,
-  zoom: true
+  zoom: true,
+
+  // SVG-related properties
+  fillOpacity: true,
+  strokeOpacity: true
 };
 
 /**