n>         
        </dt>
        <dd>
          A wrapper for a raw callback handle. <a href="dart-ui/CallbackHandle-class.html">[...]</a>
        </dd>
        <dt id="Canvas">
          <span class="name "><a href="dart-ui/Canvas-class.html">Canvas</a></span>         
        </dt>
        <dd>
          An interface for recording graphical operations. <a href="dart-ui/Canvas-class.html">[...]</a>
        </dd>
        <dt id="Codec">
          <span class="name "><a href="dart-ui/Codec-class.html">Codec