Javascript trim whitespace

<html>
  <head>
    <title> javascript trim function </title>
  </head>
  <body>
    <h1> javascript trim function </h1>
    <p> trim function remove the whitespace from both starting and ending point of string </p>
    <p id='demo'></p>
    <script>
      var str = ' John the Don  '
      var trimstr = str.trim();
      
      document.getElementById('demo').innerHTML = trimstr; 
    </script>
  </body>

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