[alangpierce]

Just to balance the "70% of websites" number, I've worked on a number of websites where there was still some legacy jQuery floating around, but where all new development is expected to happen in a modern framework like React, and new code using jQuery would be unlikely to pass code review. Or, perhaps, where jQuery is legitimately used as part of the occasional escape hatch when you can't use React for some technical reason, but is discouraged and only used with careful scrutiny.

I suspect that if you refined it to "How many new websites in the last year use jQuery as their primary UI library?", the number would be much lower.