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SpeechSynthesisEvent: charIndex property

The charIndex read-only property of the SpeechSynthesisUtterance interface returns the index position of the character in SpeechSynthesisUtterance.text that was being spoken when the event was triggered.

Value

A number.

Examples

js

utterThis.onpause = (event) => {
  const char = event.utterance.text.charAt(event.charIndex);
  console.log(
    `Speech paused at character ${event.charIndex} of "${event.utterance.text}", which is "${char}".`,
  );
};

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
charIndex 33 14 49 No 21 7 No 33 62 No 7 3.0

See also

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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