n class="returntype">dynamic</span>
      <span class="name ">operator []</span>
(<wbr><span class="parameter" id="[]-param-key"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">key</span></span>)
    </section>
    <section class="desc markdown">
      <p>Retrieves the zone-value associated with <code>key</code>.</p>
<p>If this zone does not contain the value looks up the same key in the
parent zone. If the <code>key</code> is not found retu