Beispiel:JS-WebSpeech-1.html

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<!DOCTYPE html>
<html lang="de">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./Beispiel:SELFHTML-Beispiel-Grundlayout.css" />  
  <title>Sprachausgabe mit WebSpeech - 1</title>
<style>
output {
  font-family: monospace;
}

.not-supported {
  color: #c32e04;
  font-weight: bold;
}

</style>
<script>
'use strict';  
document.addEventListener('DOMContentLoaded', function () {
	
  document.querySelector('#play').addEventListener('click', speak);
  
  if ('speechSynthesis' in window) {
	document.querySelector('#output').innerText = 'Ihr Browser <strong>unterstützt </strong> Speech Synthesis.';
  } else {
	document.querySelector('#output').innerText = 'Sorry, Ihr Browser  <strong>unterstützt keine </strong> Speech Synthesis.';
	document.querySelector('#output').classList.add('not-supported');
  }
	
  function speak() { 
	var msg = new SpeechSynthesisUtterance();
	var voices = window.speechSynthesis.getVoices();
	msg.voice = voices[10]; // Note: some voices don't support altering params
	msg.voiceURI = 'native';
	msg.volume = 1; // 0 to 1
	msg.rate = 1; // 0.1 to 10
	msg.pitch = 2; //0 to 2
	msg.text = 'Hello my friend';
	msg.lang = 'en-US';

	msg.onend = function(e) {
      document.querySelector('#output').textContent = (event.elapsedTime/1000) + ' Sek';
	};

	speechSynthesis.speak(msg);  
  }

});
</script>
</head>

<body>
<h1>Sprachausgabe mit WebSpeech - 1</h1>

<button type="button" id="play">▶ (Sprich!)</button>

<p><label for="output">Dauer: </label><output id="output"></output>

</body>

</html>