 associated with any Event delegation,
accessing this value will throw an <code class="prettyprint lang-dart">UnsupportedError</code>.
            </dd>
            <dt id="metaKey" class="property">
                <span class="top-level-variable-type">bool</span>
                <a href="polymer_app_layout.behaviors/TouchEvent/metaKey.html">metaKey</a>
            </dt>
            <dd>
                <div class="readable-writable">
        read-only
    </div>
    
            </dd>
            <dt id="