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SpeechSynthesisEvent.elapsedTime

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The elapsedTime read-only property of the SpeechSynthesisUtterance interface returns the elapsed time in seconds after the SpeechSynthesisUtterance.text started being spoken that the event was triggered at.

Syntax

event.elapsedTime;

Value

A float.

Examples

utterThis.onboundary = function(event) {
  console.log(event.name + ' boundary reached after ' + event.elapsedTime + ' seconds.');
}

Specifications

Specification Status Comment
Web Speech API
The definition of 'elapsedTime' in that specification.		 Draft

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 33 Yes 49 No 21 7
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support 4.4.3 33 Yes 62
62
61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
 No 7.1 ?

See also

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https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisEvent/elapsedTime