Base Web is Uber's React component library built on the Styletron CSS-in-JS engine.
About 98 websites in the PageSourceSearch index contain the code that reveals it; the 50 highest-ranked are listed below.
How is Base Web detected?
Base Web components mark their root elements with the attribute data-baseweb=, such as data-baseweb="button". 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 Base Web
Top 50 websites using Base Web
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 2026-10-12 01:06:26 UTC.
How does PageSourceSearch know a website uses Base Web?
By the source itself: Base Web components mark their root elements with the attribute data-baseweb=, such as data-baseweb="button". 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 Base Web?
No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of about 98 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 Base Web 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-baseweb= with wp-content/plugins/ lists the WordPress sites that use Base Web.