# angular.service.$window

Work in Progress This page is currently being revised. It might be incomplete or contain inaccuracies.

## Description

A 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

      <input ng:init="$window = $service('$window'); greeting='Hello World!'" type="text" name="greeting" />
      <button ng:click="$window.alert(greeting)">ALERT</button>