Definition
Web Speech API defines SpeechSynthesis
[Exposed=Window]
interface SpeechSynthesis : EventTarget {
readonly attribute boolean pending;
readonly attribute boolean speaking;
readonly attribute boolean paused;
attribute EventHandler onvoiceschanged;
undefined speak(SpeechSynthesisUtterance utterance);
undefined cancel();
undefined pause();
undefined resume();
sequence<SpeechSynthesisVoice> getVoices();
};