SpeechSynthesisEvent: elapsedTime property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2018.
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.
Value
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.
Examples
js
utterThis.onboundary = (event) => {
console.log(
`${event.name} boundary reached after ${event.elapsedTime} seconds.`,
);
};
Specifications
| Specification |
|---|
| Web Speech API # dom-speechsynthesisevent-elapsedtime |
Browser compatibility
| desktop | mobile | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
elapsedTime | |||||||||||
elapsedTime in milliseconds | |||||||||||