ev/flutter/widgets/Widget/key.html">key</a></span>
  <span class="signature">&#8594; <a href="https://api.flutter.dev/flutter/foundation/Key-class.html">Key</a>?</span>
  

</dt>
<dd class="inherited">
  Controls how one widget replaces another widget in the tree.
  <div class="features"><span class="feature">final</span><span class="feature">inherited</span></div>

</dd>

        <dt id="runtimeType" class="property inherited">
  <span class="name"><a href="https://api.flutter.dev/flutter/dart-core/Object/