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diff --git a/src/service/window.js b/src/service/window.js
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+++ b/src/service/window.js
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+/**
+ * @workInProgress
+ * @ngdoc service
+ * @name angular.service.$window
+ *
+ * @description
+ * Is reference to the browser's `window` object. While `window`
+ * is globally available in JavaScript, it causes testability problems, because
+ * it is a global variable. In angular we always refer to it through the
+ * `$window` service, so it may be overriden, removed or mocked for testing.
+ *
+ * All expressions are evaluated with respect to current scope so they don't
+ * suffer from window globality.
+ *
+ * @example
+   <doc:example>
+     <doc:source>
+       <input ng:init="$window = $service('$window'); greeting='Hello World!'" type="text" name="greeting" />
+       <button ng:click="$window.alert(greeting)">ALERT</button>
+     </doc:source>
+     <doc:scenario>
+     </doc:scenario>
+   </doc:example>
+ */
+angularServiceInject("$window", bind(window, identity, window), [], true);