Bootstrap 5 is the current major version of Bootstrap, without the jQuery dependency.
About 207,234 websites in the PageSourceSearch index contain the code that reveals it; the 50 highest-ranked are listed below.
How is Bootstrap 5 detected?
Bootstrap 5 renamed its data API to data-bs-*, so its collapses, dropdowns and modals are wired with data-bs-toggle. The discovery keyword is the exact bytes PageSourceSearch looks for in every stored page and script:
A literal is matched byte for byte, case-sensitively. Combine it with another keyword, a domain, a kind or a date filter on the search page to narrow the list. About Bootstrap 5
Top 50 websites using Bootstrap 5
Ranked by the domain's position in the crawl's ranked list (Common Crawl harmonic centrality), highest first. view source opens the stored page or script with the match highlighted. Computed 2026-10-01 02:32:38 UTC.
an>An official website of the United States government</span> </div> <span> <a data-bs-toggle="collapse" href="#gov-notice" role="button" aria-expanded="false" aria-controls="gov-notice">
How does PageSourceSearch know a website uses Bootstrap 5?
By the source itself: Bootstrap 5 renamed its data API to data-bs-*, so its collapses, dropdowns and modals are wired with data-bs-toggle. PageSourceSearch stores the raw HTML and first-party JavaScript of each crawled site and matches the keyword byte for byte, so every listed site's stored source contains it.
Is this a complete list of websites using Bootstrap 5?
No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of about 207,234 websites that do; the count is the index's estimate at the time the list was computed. Run the keyword as a search to page through all of them, or add a kind or date filter.
How do I find websites that use Bootstrap 5 together with another technology?
Search for both keywords at once: several terms separated by spaces must all be found on the same site, or with the Same page toggle in the same page. For example data-bs-toggle= with wp-content/plugins/ lists the WordPress sites that use Bootstrap 5.