SpeechRecognition: audiostart event

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

The audiostart event of the Web Speech API is fired when the user agent has started to capture audio for speech recognition.

Bubbles No
Cancelable No
Interface Event
Event handler onaudiostart


You can use the audiostart event in an onaudiostart method:

var recognition = new webkitSpeechRecognition() || new SpeechRecognition();

recognition.addEventListener('audiostart', function() {
  console.log('Audio capturing started');

Or use the onaudiostart event handler property:

recognition.onaudiostart = function() {
  console.log('Audio capturing started');


Specification Status Comment
Web Speech API
The definition of 'speech recognition events' in that specification.
Draft Β 

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
audiostart event
Chrome Full support 33Edge Full support 79Firefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android Full support YesChrome Android Full support YesFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android Full support Yes


Full support Β 
Full support
No support Β 
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also