This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The start event of the Web Speech API SpeechSynthesisUtterance object is fired when the utterance has begun to be spoken.
| Bubbles | No |
|---|---|
| Cancelable | No |
| Interface | SpeechSynthesisEvent |
| Event handler property | onstart |
Examples
You can use the start event in an addEventListener method:
utterThis.addEventListener('start', function(event) {
console.log('We have started uttering this speech: ' + event.utterance.text);
});
Or use the onstart event handler property:
utterThis.onstart = function(event) {
console.log('We have started uttering this speech: ' + event.utterance.text);
}
Specifications
| Specification | Status | Comment |
|---|---|---|
| Web Speech API The definition of 'speech synthesis utterance events' in that specification. |
Draft |
Browser compatibility
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
Find out how you can help!
| 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 |
- [1] Can be enabled via the
media.webspeech.synth.enabledflag in about:config.