SpeechSynthesisVoice: localService 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 localService read-only property of the SpeechSynthesisVoice interface returns a boolean value indicating whether the voice is supplied by a local speech synthesizer service (true), or a remote speech synthesizer service (false.)

This property is provided to allow differentiation in the case that some voice options are provided by a remote service; it is possible that remote voices might have extra latency, bandwidth or cost associated with them, so such distinction may be useful.

Value

A boolean value.

Examples

for (const voice of voices) {
  const option = document.createElement("option");
  option.textContent = `${voice.name} (${voice.lang})`;

  if (voice.default) {
    option.textContent += " — DEFAULT";
  }

  console.log(voice.localService);

  option.setAttribute("data-lang", voice.lang);
  option.setAttribute("data-name", voice.name);
  voiceSelect.appendChild(option);
}