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>