ritable">
        read-only
    </div>
    Checks to see if the LoadEnd event is supported on the current platform.
            </dd>
            <dt id="supportsOverrideMimeType" class="property">
                <span class="top-level-variable-type">bool</span>
                <a href="polymer_app_layout/HttpRequest/supportsOverrideMimeType.html">supportsOverrideMimeType</a>
            </dt>
            <dd>
                <div class="readable-writable">
        read-only
    </div>
    Checks to see if