Javascript conditionals

<html>
  <head> 
    <title> switch statement  </title>
  </head>
  <body>
    <h2> switch statement </h2>
    <script>
      var option=5;
      switch(option){
        case 1:
          alert('case 1 is true');
        case 2:
          alert('case 2 is true');
        case 3:
          alert('case 3 is true');
      }
    </script>
  </body>

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</html>