do copy to the clipboard in javascript

<!DOCTYPE html>
<html>
<head>
<title>do copy to the clipboard in javascript</title>
    <style>
        
    </style>
</head>
<body>
    <p>
  <textarea class="js-copytextarea">Hello I'm some text</textarea>
</p>

<p>
  <button class="js-textareacopybtn">Copy Textarea</button>
</p>
    <script type="text/javascript">
        var copyTextareaBtn = document.querySelector('.js-textareacopybtn');

copyTextareaBtn.addEventListener('click', function(event) {
  var copyTextarea = document.querySelector('.js-copytextarea');
  copyTextarea.select();

  try {
    var successful = document.execCommand('copy');
    var msg = successful ? 'successful' : 'unsuccessful';
    console.log('Copying text command was ' + msg);
  } catch (err) {
    console.log('Oops, unable to copy');
  }
});
    </script>
</body>
</html>


the textarea must be visible. Reference: http://stackoverflow.com/questions/400212/how-do-i-copy-to-the-clipboard-in-javascript

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