Tryit Editor v1.8

Source Code:

<!DOCTYPE html>
<html>
<body>

<script>
document.write("Hello World!")
</script>
<noscript>Sorry, your browser does not support JavaScript!</noscript>

<p>A browser without support for JavaScript will show the text inside the &lt;noscript&gt; element.</p>
 
</body>
</html>

Result:

W3Schools.com - Try it yourself

Edit the code above and click "Submit Code" to see the result.