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diff --git a/src/directive/ngStyle.js b/src/directive/ngStyle.js
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+'use strict';
+
+/**
+ * @ngdoc directive
+ * @name angular.module.ng.$compileProvider.directive.ng:style
+ *
+ * @description
+ * The ng:style allows you to set CSS style on an HTML element conditionally.
+ *
+ * @element ANY
+ * @param {expression} expression {@link guide/dev_guide.expressions Expression} which evals to an
+ *      object whose keys are CSS style names and values are corresponding values for those CSS
+ *      keys.
+ *
+ * @example
+   <doc:example>
+     <doc:source>
+        <input type="button" value="set" ng:click="myStyle={color:'red'}">
+        <input type="button" value="clear" ng:click="myStyle={}">
+        <br/>
+        <span ng:style="myStyle">Sample Text</span>
+        <pre>myStyle={{myStyle}}</pre>
+     </doc:source>
+     <doc:scenario>
+       it('should check ng:style', function() {
+         expect(element('.doc-example-live span').css('color')).toBe('rgb(0, 0, 0)');
+         element('.doc-example-live :button[value=set]').click();
+         expect(element('.doc-example-live span').css('color')).toBe('rgb(255, 0, 0)');
+         element('.doc-example-live :button[value=clear]').click();
+         expect(element('.doc-example-live span').css('color')).toBe('rgb(0, 0, 0)');
+       });
+     </doc:scenario>
+   </doc:example>
+ */
+var ngStyleDirective = ngDirective(function(scope, element, attr) {
+  scope.$watch(attr.ngStyle, function(newStyles, oldStyles) {
+    if (oldStyles && (newStyles !== oldStyles)) {
+      forEach(oldStyles, function(val, style) { element.css(style, '');});
+    }
+    if (newStyles) element.css(newStyles);
+  }, true);
+});