SpeechSynthesisEvent: charLength property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2018.

The read-only charLength property of the SpeechSynthesisEvent interface returns the number of characters left to be spoken after the character at the charIndex position.

If the speech engine can't determine it, it returns 0.

Value

An integer.

Examples

js
utterThis.onpause = (event) => {
  const char = event.utterance.text.charAt(event.charIndex);
  const charLeft = event.charLength;
  if (charLeft) {
    console.log(
      `Speech paused. There are still ${charLeft} characters to be spoken.`,
    );
  } else {
    console.log(
      "Speech paused. The underlying speech engine can't tell how many characters are left.",
    );
  }
};

Specifications

Specification
Web Speech API
# dom-speechsynthesisevent-charlength

Browser compatibility