SpeechSynthesisUtterance: boundary event

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The boundary event of the Web Speech API is fired when the spoken utterance reaches a word or sentence boundary.

Bubbles No
Cancelable No
Interface SpeechSynthesisEvent
Event handler onboundary

Examples

You can use the boundary event in an addEventListener method:

utterThis.addEventListener('boundary', function(event) {
  console.log(event.name + ' boundary reached after ' + event.elapsedTime + ' seconds.');
});

Or use the onboundary event handler property:

utterThis.onboundary = function(event) {
  console.log(event.name + ' boundary reached after ' + event.elapsedTime + ' seconds.');
}

Specifications

Specification
Web Speech API
# eventdef-speechsynthesisutterance-boundary

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
boundary_event
33
14
49
No
21
7
No
33
The boundary event does not fire as expected. See bug 1122143.
62
No
7
3.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance/boundary_event