 indicating the current brightness mode of the host platform.
If the platform has no preference, <a href="../dart-ui/Window/platformBrightness.html">platformBrightness</a> defaults to <a href="../dart-ui/Brightness-class.html">Brightness.light</a>. 
                  <div class="features">read-only</div>
</dd>
        <dt id="semanticsEnabled" class="property">
          <span class="name"><a href="../dart-ui/Window/semanticsEnabled.html">semanticsEnabled</a></span>
          <span class="signature">&#8594;