/EventStreamProvider-class.html">EventStreamProvider</a>&lt;<a href="dart-html/MessageEvent-class.html">MessageEvent</a>&gt;</span>
                <span class="name "><a href="polymer_app_layout.behaviors/MessagePort/messageEvent.html">messageEvent</a></span>
                =
                <span class="constant-value">const <a href="polymer_app_layout/EventStreamProvider-class.html">EventStreamProvider</a>&lt;<a href="dart-html/MessageEvent-class.html">MessageEvent</a>&gt;<MessageEvent>('message')</span