Baseline Widely available
The SpeechSynthesisEvent interface of the Web Speech API contains information about the current state of SpeechSynthesisUtterance objects that have been processed in the speech service.
SpeechSynthesisEvent()
Creates a new SpeechSynthesisEvent.
The SpeechSynthesisEvent interface also inherits properties from its parent interface, Event.
SpeechSynthesisEvent.charIndex Read only
Returns the index position of the character in the SpeechSynthesisUtterance.text that was being spoken when the event was triggered.
SpeechSynthesisEvent.charLength Read only
Returns the number of characters left to be spoken after the charIndex position, if the speaking engine supports it. Returns 0 if the speaking engine can't provide the information.
SpeechSynthesisEvent.elapsedTime Read only
Returns the elapsed time in seconds after the SpeechSynthesisUtterance.text started being spoken that the event was triggered at.
SpeechSynthesisEvent.name Read only
Returns the name associated with certain types of events occurring 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.
SpeechSynthesisEvent.utterance Read only
Returns the SpeechSynthesisUtterance instance that the event was triggered on.
The SpeechSynthesisEvent interface also inherits methods from its parent interface, Event.
utterThis.onpause = (event) => {
const char = event.utterance.text.charAt(event.charIndex);
console.log(
`Speech paused at character ${event.charIndex} of "${event.utterance.text}", which is "${char}".`,
);
};
utterThis.onboundary = (event) => {
console.log(
`${event.name} boundary reached after ${event.elapsedTime} seconds.`,
);
};
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