ction</a> callback might be called
with an action that is no longer possible.</p>
<p>The <code>label</code> is a string that describes this node. The <code>value</code> property
describes the current value of the node as a string. The <code>increasedValue</code>
string will become the <code>value</code> string after a <a href="../../dart-ui/SemanticsAction/increase-constant.html">SemanticsAction.increase</a>
action is performed. The <code>decreasedValue</code> string will become the <code>value</code>
strin