UI frameworks
Who left W3.CSS, and who still runs it
614 websites in the top 1M run W3.CSS, observed directly from the rendered page in the July 2026 crawl.
123
stopped running it that month
13
of those are 11–500 employees
288
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running W3.CSS
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
jQuery 78%Cloudflare 65%Font Awesome 61%Bootstrap 54%Google Font API 54%cdnjs 48%Google Analytics 45%PHP 45%Open Graph 36%HTTP/3 34%
Share of a 614-domain sample of W3.CSS users that also run each.