<a class="type" title="js.html.Window - The Window interface represents a window containing a DOM document; the document property points to the DOM document loaded in that window." href="../../js/html/Window.html">Window</a>&gt;</code></h3><div class="doc"><p></p></div></div><div class="field "><a name="shiftKey"></a><h3 class="anchor"><code><span class="label label-meta label-meta-optional" title="Marks the field of a structure as optional.">@:optional</span><span class="label label-optional">optional</spa