API Experimental Interface Reference speech SpeechSynthesisEvent synthesis Web Speech API

The charIndex read-only property of the SpeechSynthesisUtterance interface returns the index position of the character in the SpeechSynthesisUtterance.text that was being spoken when the event was triggered.

API charIndex Experimental Property Reference speech SpeechSynthesisEvent synthesis Web Speech API

The elapsedTime read-only property of the SpeechSynthesisUtterance interface returns the elapsed time in milliseconds after the SpeechSynthesisUtterance.text started being spoken that the event was triggered at.

API elapsedTime Experimental Property Reference speech SpeechSynthesisEvent synthesis Web Speech API

The name read-only property of the SpeechSynthesisUtterance interface returns the name associated with certain types of events occuring as the SpeechSynthesisUtterance.text is being spoken: the name of the SSML marker reached in the case of a mark event, or the type of boundary reached in the case of a boundary event.

API Experimental name Property Reference speech SpeechSynthesisEvent synthesis Web Speech API

The utterance read-only property of the SpeechSynthesisUtterance interface returns the SpeechSynthesisUtterance instance that the event was triggered on.

API Experimental Property Reference speech SpeechSynthesisEvent synthesis utterance Web Speech API