JavaScript string indexOf method

<html>
<head>
  <title>javascript indexof method </title>
  </head>
  <body>
    <p> javascript string indexof method with optional parameter </p>
    <p id='demo'></p>
    
    <script>
      var name = 'John the Don is Don'
      var index = name.indexOf('Don',11);
      document.getElementById('demo').innerHTML=index;
    </script>
  </body>

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