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 |
| Target objects | SpeechSynthesisUtterance |
| Interface | SpeechSynthesisEvent |
utterThis.onboundary = function(event) {
console.log(event.name + ' boundary reached after ' + event.elapsedTime + ' milliseconds.');
} The boundary event implements the SpeechSynthesisEvent interface, which inherits from Event. It therefore has available the properties and methods defined on both these interfaces.
| Specification | Status | Comment |
|---|---|---|
| Web Speech API The definition of 'speech synthesis utterance events' in that specification. | Draft |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 33 | (Yes) | 44 (44) [1] | No support | No support | No support |
| Feature | Android | Chrome | Edge | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | (Yes) | ? | 2.5 | No support | No support | No support |
media.webspeech.synth.enabled flag in about:config.
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https://developer.mozilla.org/en-US/docs/Web/Events/boundary