SpeechSynthesisUtterance Interface

interface SpeechSynthesisUtterance : EventTarget {
  attribute DOMString text;  //要說的文字
  attribute DOMString lang;  //文字的語言
  attribute DOMString voiceURI;  //語音引擎來源
  attribute SpeechSynthesisVoice voice; //Only in WebKit implementation.
  attribute float volume;  //講話的音量(0~1)
  attribute float rate;  //講話的速率
  attribute float pitch;  //講話的節拍(0~2)
  
  attribute EventHandler onstart;
  attribute EventHandler onend;
  attribute EventHandler onerror;
  attribute EventHandler onpause;
  attribute EventHandler onresume;
  attribute EventHandler onmark;
  attribute EventHandler onboundary;
};