javascript - SpeechSynthesisUtterance 未触发 "mark"事件

Question

我无法获得 mark 事件 SpeechSynthesisUtterance 实例触发。

据我所知，这应该有效。我期待看到

Started
Reached mark
Done

相反，我得到

Started
Done

document.querySelector('#play').addEventListener('click', function speak() {
  const utterance = new SpeechSynthesisUtterance(
    `<?xml version="1.0"?>
    <speak version="1.1">Foo <mark name="bar" /> baz.</speak>`
  )
  
  const log = document.getElementById('log')

  utterance.addEventListener('start', () => {log.value = 'Started\n'})
  utterance.addEventListener('mark', () => {log.value += 'Reached mark\n'})
  utterance.addEventListener('end', () => {log.value += 'Done\n'})

  log.value = 'Waiting…'
  speechSynthesis.cancel()

  speechSynthesis.speak(utterance)
})

<textarea id="log" disabled rows="3">Waiting…</textarea>
<hr>
<button id="play">Speak</button>

Answer 1

很抱歉让您知道这是一个错误并且 SSML 尚未实现。

https://github.com/WICG/speech-api/issues/10
https://bugs.chromium.org/p/chromium/issues/detail?id=88072

你会看到 chronium 问题已经有 9 年的历史了，所以我怀疑它会很快得到修复。