Check out example codes for "noscript". It will help you in understanding the concepts better.
Code Example 1
<noscript>
You need enabled javascript for run this website
<noscript>
Code Example 2
The <noscript> tag defines an alternate content to be displayed to users that have disabled scripts in their browser or have a browser that doesn't support script. The <noscript> element can be used in both <head> and <body>.
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