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Hello World Alert box using Javascript

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<html>

   <head>
      
   
      <script type="text/javascript">
         <!--
            function sayHello() {
               alert("Hello World")
            }
         //-->
      </script>
      
   </head>
   <style>
       body{background-color: blue;}
   </style>
   
   
   <body>
       
      <input type="button" onclick="sayHello()" value="Say Hello" />
   </body>
   
</html>

Hello World Alert box using Javascript

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