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chromium/third_party/blink/web_tests/external/wpt/vibration/simple-array-manual.html 

<!DOCTYPE html>
<html>
  <head>
    <meta charset='utf-8'/>
    <title>Vibration API: test a simple array parameter to vibrate()</title>
    <link rel='author' title='Robin Berjon' href='mailto:[email protected]'/>
    <link rel='help' href='http://www.w3.org/TR/vibration/#methods'/>
  </head>
  <body>
    <h1>Description</h1>
    <p>
      After hitting the button below, your device must vibrate continuously for about two seconds, once.
    </p>
    <button id='vib'>Vibrate!</button>
    <div id='log'></div>
    <script>
      document.getElementById("vib").onclick = function () {
        navigator.vibrate([2000]);
      };
    </script>
  </body>
</html>