SpeechRecognition: start event

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The start event of the Web Speech API SpeechRecognition object is fired when the speech recognition service has begun listening to incoming audio with intent to recognize grammars associated with the current SpeechRecognition.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("start", (event) => {});

onstart = (event) => {};

Event type

A generic Event with no added properties.

Examples

You can use the start event in an addEventListener method:

js
const recognition = new webkitSpeechRecognition() || new SpeechRecognition();

recognition.addEventListener("start", () => {
  console.log("Speech recognition service has started");
});

Or use the onstart event handler property:

js
recognition.onstart = () => {
  console.log("Speech recognition service has started");
};

Specifications

Specification
Web Speech API
# eventdef-speechrecognition-start
Web Speech API
# dom-speechrecognition-onstart

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
start event

Legend

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Full support
Full support
No support
No support

See also