/Size-class.html">Size</a> and <a href="dart-ui/Offset-class.html">Offset</a>, which are both ways to describe
a distance as a two-dimensional axis-aligned vector.
        </dd>
        <dt id="OffsetEngineLayer">
          <span class="name "><a href="dart-ui/OffsetEngineLayer-class.html">OffsetEngineLayer</a></span>         
        </dt>
        <dd>
          An opaque handle to an offset engine layer. <a href="dart-ui/OffsetEngineLayer-class.html">[...]</a>
        </dd>
        <dt id="OpacityEngineLa