o indicate to the
user that it can be removed after it is no longer relevant. On Android,
(with TalkBack) special hint text is spoken when focusing the node and
a custom action is available in the local context menu. On iOS,
(with VoiceOver) users can perform a standard gesture to dismiss it.</p>
    </section>
        <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">static const SemanticsAction dismiss 