arent</span>
          
</section>
        
                <section class="desc markdown">
          <p>The parent zone of the this zone.</p>
<p>Is <code>null</code> if <code>this</code> is the <a href="dart-async/Zone/root-constant.html">root</a> zone.</p>
<p>Zones are created by <a href="dart-async/Zone/fork.html">fork</a> on an existing zone, or by <a href="dart-async/runZoned.html">runZoned</a> which
forks the <a href="dart-async/Zone/current.html">current</a> zone. The new zone's parent zone is the zo