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SpeechSynthesisEvent: elapsedTime property

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
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
49–95Windows and macOS only.
 No 21 7–14.1 No 33 No No 7–14.5 3.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisEvent/elapsedTime