This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The charIndex read-only property of the SpeechSynthesisUtterance interface returns the index position of the character in the SpeechSynthesisUtterance.text that was being spoken when the event was triggered.
event.charIndex;
A number.
utterThis.onpause = function(event) {
var char = event.utterance.text.charAt(event.charIndex);
console.log('Speech paused at character ' + event.charIndex + ' of "' +
event.utterance.text + '", which is "' + char + '".');
} | Specification | Status | Comment |
|---|---|---|
| Web Speech API The definition of 'charIndex' in that specification. | Draft |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 33 | Yes | 49 | No | 21 | 7 |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | 4.4.3 | 33 | Yes | 62
|
No | 7.1 | ? |
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisEvent/charIndex