Using the <noscript> HTML tag, you can display a notification to your website users when they have JavaScript disabled or turned off in their web browser.
Below is a noscript code example and its output.
<noscript>
For full functionality of this site it is necessary to enable JavaScript.
Here are the <a href="http://www.enable-javascript.com/" target="_blank">
Instructions to enable JavaScript in your web browser</a>.
</noscript>
To learn how to toggle JavaScript off and ON in your web browser, head over to enable-javascript.com.