SpeechRecognition: speechstart event

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This is an experimental technology
Check 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 API
The definition of 'speech recognition events' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
speechstart event
Experimental
Chrome Full support 33Edge No support NoFirefox 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 ?

Legend

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

See also