ef="dart-ui/SemanticsAction-class.html">SemanticsAction</a>s that can be undertaken
by this node. If the user wishes to undertake one of these actions on this
node, the <a href="dart-ui/Window/onSemanticsAction.html">Window.onSemanticsAction</a> will be called with <code>id</code> and one of
the possible <a href="dart-ui/SemanticsAction-class.html">SemanticsAction</a>s. Because the semantics tree is maintained
asynchronously, the <a href="dart-ui/Window/onSemanticsAction.html">Window.onSemanticsAction</a> c