JavaScript string indexOf method

<html>
  <head>
    <title>indexOf method</title>
  </head>
  <body>
    <h1> javascript indexOf method </h1>
    <p> javascript indexOf method return index of string </p>
    <p id='demo'></p>
    
    <Script>
      var name = 'John the Don'
      var index = name.indexOf('Don');
      document.getElementById('demo').innerHTML = index;
    </script>
  </body>

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