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How to find whether a browser supports JavaScript or not?

To find whether the browser supports JavaScript or nor, use the <noscript> tag. The HTML <noscript> tag is used to handle the browsers, which do recognize <script> tag but do not support scripting. This tag is used to display an alternate text message.

Here’s an example,

<!DOCTYPE html>
<html>
   <head>
      <title>HTML noscript Tag</title>
   </head>
   
<body>
      <script>
         <!--
            document.write("Hello JavaScript!")
         -->
      </script>

      <noscript>
         Your browser does not support JavaScript!
      </noscript>
   </body>
</html>