-methods">
          <h2>Methods</h2>
          <dl class="callables">
              <dt id="postMessage" class="callable">
                  <a href="polymer_app_layout.behaviors/ServiceWorkerClient/postMessage.html"><span class="name ">postMessage</span></a><span class="signature">(<wbr><span class="parameter" id="postMessage-param-message"><span class="parameter-name">message</span></span>, [<span class="parameter" id="postMessage-param-transfer"><span class="type-annotation">List&lt;<a href="dart-html/M