Web/API/SpeechRecognition/speechstart event

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

The speechstart event of the Web Speech API is fired when sound recognized by the speech recognition service as speech has been detected.

Bubbles	No
Cancelable	No
Interface	Event
Event handler property	onspeechstart

Examples

You can use the speechstart event in an addEventListener method:

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

recognition.addEventListener('speechstart', function() { 
  console.log('Speech has been detected');
});

Or use the onspeechstart event handler property:

recognition.onspeechstart = function() { 
  console.log('Speech has been detected'); 
}

Specifications

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

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
speechstart event Experimental'	Chrome Full support 33	Edge Full support 79	Firefox No support No	IE No support No	Opera No support No	Safari No support No	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android Full support Yes

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

See also

• Web Speech API

SpeechRecognition: speechstart event by Mozilla Contributors is licensed under CC-BY-SA 2.5.