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ArchiveBox works decently with Javascript and uses a headless browser, can be deployed with Docker

Which content/information sites dependant on javascript can be found? I always find marketing oriented or app interaction heavily using js and thus unable to archive...but otherwise...

Literally any modern social media, YouTube comments, anything using client-side rendering frameworks

I don't see Youtube/IG/Fb/Tiktok comments as valuable content or information, I would be surprised if somebody is treasuring such content.

Maybe tweets, but APIs are available for archiving (more or less).

True. But it's more like most sites don't work anymore. They can't run without javascript and lack any content but blank pages.

monolith can work together with headless chromium. YMMV