>
        <dd>
          Signature for <a href="dart-ui/Window/onSemanticsAction.html">Window.onSemanticsAction</a>.
                  
</dd>
        <dt id="TimingsCallback" class="callable">
          <span class="name"><a href="dart-ui/TimingsCallback.html">TimingsCallback</a></span><span class="signature">(<wbr><span class="parameter" id="TimingsCallback-param-timings"><span class="type-annotation"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter">