dd>

        <dt>Extends</dt>
        <dd><ul class="gt-separated dark class-relationships">
            <li>Object</li>
            <li><a href="polymer_app_layout/EventTarget-class.html">EventTarget</a></li>
            <li>WindowEventHandlers</li>
        </ul></dd>



        </dl>
    </section>

    <section class="summary" id="constants">
        <h2>Constants</h2>

        <dl class="properties">
            <dt id="hashChangeEvent" class="constant">
                <span class="top-level-variable-t