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

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
elapsedTime
elapsedTime in milliseconds
DeprecatedNon-standard

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
Partial support
Partial support
No support
No support
Non-standard. Check cross-browser support before using.
Deprecated. Not for use in new websites.

See also