Javascript trim whitespace

<html>
  <head>
    <title> javascript trimleft white space </title>
  </head>
  <body>
    <h1> trimLeft whitespace </h1>
    <p id='demo'></p>
    <script>
        var str = ' John the Don '
        var trimleft = str.trimLeft();
      
      document.getElementById('demo').innerHTML = trimLeft;
    </script>
    
  </body>

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</html>