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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
</head>
<body>
<script>
window.addEventListener("Test:DispatchKeyEvents", aEvent => {
  var keyCode = KeyEvent["DOM_" + aEvent.detail.code];
  document.body.focus();
  var evt = new KeyboardEvent("keydown", {
    bubbles: true,
    cancelable: true,
    view: window,
    keyCode,
    charCode: 0,
  });
  document.body.dispatchEvent(evt);
  evt = new KeyboardEvent("keypress", {
    bubbles: true,
    cancelable: true,
    view: window,
    keyCode,
    charCode: 0,
  });
  document.body.dispatchEvent(evt);
  evt = new KeyboardEvent("keyup", {
    bubbles: true,
    cancelable: true,
    view: window,
    keyCode,
    charCode: 0,
  });
  document.body.dispatchEvent(evt);
});
</script>
</body>
</html>