The elapsedTime read-only property of the SpeechSynthesisEvent returns the elapsed time in seconds, after the SpeechSynthesisUtterance.text started being spoken, at which the event was triggered.
The elapsedTime read-only property of the SpeechSynthesisEvent returns the elapsed time in seconds, after the SpeechSynthesisUtterance.text started being spoken, at which the event was triggered.
A float containing the elapsed time, in seconds.
Note: Early versions of the specification required the elapsed time in milliseconds. Check the compatibility table below for your browser.
utterThis.onboundary = function(event) { console.log(event.name + ' boundary reached after ' + event.elapsedTime + ' seconds.'); }
| Specification |
|---|
| Web Speech API # dom-speechsynthesisevent-elapsedtime |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
elapsedTime |
33 |
14 |
49 |
No |
21 |
7 |
No |
33 |
62 |
No |
7 |
3.0 |
milliseconds |
33 |
14 |
49-95
Windows and macOS only.
|
No |
21 |
7-14.1 |
No |
33 |
No |
No |
7-14.5 |
3.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisEvent/elapsedTime