Stream of boundary
events handled by this SpeechSynthesisUtterance.
Stream<SpeechSynthesisEvent> get onBoundary => boundaryEvent.forTarget(this);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/SpeechSynthesisUtterance/onBoundary.html