The <noscript> tag is use for that content which is not execute by web browser.
Example of Code
<!DOCTYPE html>
<html lang="en">
<head>
<title>Example of HTML noscript tag</title>
</head>
<body>
<script type="text/javascript">
document.write("Hello World!")
</script>
<noscript>Your browser does not support JavaScript!</noscript>
</body>
</html>
Output
Example of HTML noscript tag 