[Effen] Use a Style element instead of inline style for the Text fn node's sky

sky/framework/fn.dart

Index: sky/framework/fn.dart
diff --git a/sky/framework/fn.dart b/sky/framework/fn.dart
index a63e521701cc6e059602f3ab5f81108423d17c2e..65389e56884d1eb576a6b62220f562e7ab00b72e 100644
--- a/sky/framework/fn.dart
+++ b/sky/framework/fn.dart
@@ -351,10 +351,12 @@ class Text extends SkyNodeWrapper {
 
   SkyNodeWrapper get _emptyNode => _emptyText;
 
+  static final Style _displayParagraph = new Style('display:paragraph');
+
   sky.Node _createNode() {
     return sky.document.createElement('div')
                            ..setChild(new sky.Text(this.data))
-                           ..setAttribute('style', 'display:paragraph');
+                           ..setAttribute('class', _displayParagraph._className);
   }
 
   void _syncNode(SkyNodeWrapper old) {