       <span class="returntype parameter">&#8594; void</span>
          </span>
                  </dt>
        <dd>
          Signature for <a href="dart-ui/Window/onPlatformMessage.html">Window.onPlatformMessage</a>.
                  
</dd>
        <dt id="PlatformMessageResponseCallback" class="callable">
          <span class="name"><a href="dart-ui/PlatformMessageResponseCallback.html">PlatformMessageResponseCallback</a></span><span class="signature">(<wbr><span class="parameter" id="PlatformMessageRe