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Take your Kindle and visit https://html5test.com/ and that should give you a good idea.

Spoiler: it scores pretty low but supports JavaScript, which is surprising.

PS: You could have gotten this answered more quickly by Googling.

https://nagekar.com/2018/10/testing-websites-on-kindle-paper...

I had see this. But the html5test page had this info:

“ HTML5test is dead. It's been dead for a while. In fact it hasn't been updated since 2016.

Older Kindles (very old - like 4th gen) will have expired root certificates, so you'll need an unencrypted version if you want the site to be accessible by those users.

I'm not aware of any comprehensive documentation on this subject though. I'd say that if the site works on your 7th gen paperwhite it will probably work for the majority of users, although there are definitely a few old units still out there from the ~2011 heyday.

What model Kindle do you have?

I have Kindle Paperwhite 2017

Ask HN: Kindle Browser Specs?