sCallback.html">TimingsCallback</a></span>         
        </dt>
        <dd>
          A callback that is invoked to report the <a href="../dart-ui/FrameTiming-class.html">FrameTiming</a> of recently
rasterized frames. <a href="../dart-ui/Window/onReportTimings.html">[...]</a>
                  <div class="features">read / write</div>
</dd>
        <dt id="onSemanticsAction" class="property">
          <span class="name"><a href="../dart-ui/Window/onSemanticsAction.html">onSemanticsAction</a></span>
     