eturntype"><a href="polymer_app_layout/EventStreamProvider-class.html">EventStreamProvider</a>&lt;<a href="dart-html/MediaKeyEvent-class.html">MediaKeyEvent</a>&gt;</span>
              <span class="name ">keyErrorEvent</span>              =
              <span class="constant-value">const <a href="polymer_app_layout/EventStreamProvider-class.html">EventStreamProvider</a>&lt;<a href="dart-html/MediaKeyEvent-class.html">MediaKeyEvent</a>&gt;<MediaKeyEvent>('webkitkeyerror')</span>
    </section>

    <sectio