SpeechRecognitionAlternative: confidence property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The confidence read-only property of the
SpeechRecognitionResult interface returns a numeric estimate of how
confident the speech recognition system is that the recognition is correct.
Note:
Mozilla's implementation of confidence is still
being worked on — at the moment, it always seems to return 1.
Value
A number between 0 and 1.
Examples
This code is excerpted from our Speech color changer example.
js
recognition.onresult = (event) => {
const color = event.results[0][0].transcript;
diagnostic.textContent = `Result received: ${color}.`;
bg.style.backgroundColor = color;
console.log(`Confidence: ${event.results[0][0].confidence}`);
};
Specifications
| Specification |
|---|
| Web Speech API # dom-speechrecognitionalternative-confidence |
Browser compatibility
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confidence
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support