onStart property

Stream<SpeechSynthesisEvent> onStart
@DocsEditable(), @DomName('SpeechSynthesisUtterance.onstart')

Stream of start events handled by this SpeechSynthesisUtterance.

Implementation 

@DomName('SpeechSynthesisUtterance.onstart')
@DocsEditable()
Stream<SpeechSynthesisEvent> get onStart => startEvent.forTarget(this);