That’s no small number at Google scale. Google processes around 8.5 billion searches per day, so one can assume that millions of people performing searches through Google aren’t using JavaScript.

Google still recommends you avoid using JavaScript for canonical tags but if you must, Google provided these recommendations.

Google says there’s no need to worry about JavaScript when it comes to search, as there’s nothing fundamentally different about it compared to static content. This is discussed in the latest ...

Software javascript JavaScript now mandatory for Google Search, Google confirms Static pages are gone, and SEO checking tools don't seem to work anymore By Alfonso Maruccia January 21, 2025 at 8: ...

For reference, Google’s Search Central documentation around redirects first included JavaScript redirects in June 2021, so in terms of the overall “SEO timeline,” this is still quite new.