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

The onnomatch property of the SpeechRecognition interface represents an event handler that will run when the speech recognition service returns a final result with no significant recognition (when the nomatch event fires.)

This may involve some degree of recognition, which doesn't meet or exceed the confidence threshold.

Note: The onnomatch handler does not yet work properly in Firefox — the speech recognition system always returns a positive match, and then guesses at what item in the grammar it found. This is being worked on.


mySpeechRecognition.onnomatch = function() { ... };


var recognition = new SpeechRecognition();

recognition.onnomatch = function() {
  console.log('Speech not recognised');


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support33 webkit 1 ? No No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes webkit 1 Yes webkit 1 ? No No No ?

1. You'll need to serve your code through a web server for recognition to work.

Firefox OS permissions

To use speech recognition in an app, you need to specify the following permissions in your manifest:

"permissions": {
  "audio-capture" : {
    "description" : "Audio capture"
  "speech-recognition" : {
    "description" : "Speech recognition"

You also need a privileged app, so you need to include this as well:

  "type": "privileged"

See also

Étiquettes et contributeurs liés au document

Contributeurs à cette page : lucian95, chrisdavidmills
Dernière mise à jour par : lucian95,