How does PageSourceSearch know a website uses U.S. Web Design System (USWDS)?

By the source itself: USWDS sites show the official government banner, which is marked up with the usa-banner class. 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 U.S. Web Design System (USWDS)?

No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of about 28,720 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 U.S. Web Design System (USWDS) 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 usa-banner with wp-content/plugins/ lists the WordPress sites that use U.S. Web Design System (USWDS).

UI libraries and CSS

Websites using U.S. Web Design System (USWDS)

USWDS is the design system and component library for U.S. federal government websites. About 28,720 websites in the PageSourceSearch index contain the code that reveals it; the 50 highest-ranked are listed below.

How is U.S. Web Design System (USWDS) detected?

USWDS sites show the official government banner, which is marked up with the usa-banner class. The discovery keyword is the exact bytes PageSourceSearch looks for in every stored page and script:

usa-banner Search the index for it

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 U.S. Web Design System (USWDS)

Top 50 websites using U.S. Web Design System (USWDS)

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 2026-10-04 21:07:27 UTC.

#	Website	Rank	Found in
1	cdc.gov	85	html https://www.cdc.gov/about/	view source profile
2	irs.gov	127	html https://www.irs.gov/	view source profile
3	justice.gov	236	html https://www.justice.gov/	view source profile
4	sba.gov	242	html https://www.sba.gov/	view source profile
5	sec.gov	251	html https://www.sec.gov/	view source profile
6	treasury.gov	258	html https://home.treasury.gov/	view source profile
7	usa.gov	280	html https://www.usa.gov/	view source profile
8	nist.gov	318	html https://www.nist.gov/	view source profile
9	usgs.gov	341	html https://www.usgs.gov/	view source profile
10	bls.gov	469	html https://data.bls.gov/dataQuery/search	view source profile
11	bea.gov	551	html https://bea.gov/	view source profile
12	usaspending.gov	843	js https://www.usaspending.gov/app.e713870c62edc48b3469.js	view source profile
13	uspto.gov	853	js https://components.uspto.gov/js/Uni-…=USPTO&yt=true	view source profile
14	blm.gov	868	html https://www.blm.gov/	view source profile
15	census.gov	1,035	html https://www.census.gov/	view source profile
16	epa.gov	1,250	html https://www.epa.gov/	view source profile
17	cisa.gov	1,468	html https://www.cisa.gov/	view source profile
18	ic3.gov	1,775	html https://www.ic3.gov/	view source profile
19	eeoc.gov	1,916	html https://www.eeoc.gov/	view source profile
20	nps.gov	1,954	html https://www.nps.gov/aboutus/contactus.htm	view source profile
21	ada.gov	2,018	html https://www.ada.gov/	view source profile
22	fdic.gov	2,147	html https://www.fdic.gov/	view source profile
23	fincen.gov	2,202	html https://www.fincen.gov/	view source profile
24	gao.gov	2,255	js https://www.gao.gov/assets/js/js_J90…g2HWpy4RL-S2nHPvANRP3Ok	view source profile
25	section508.gov	2,455	html https://www.section508.gov/	view source profile
26	cbp.gov	2,501	html https://www.cbp.gov/	view source profile
27	dhs.gov	2,614	html https://www.dhs.gov/	view source profile
28	pa.gov	2,630	html https://www.pa.gov/	view source profile
29	va.gov	2,805	html https://www.va.gov/	view source profile
30	darpa.mil	3,311	html https://www.darpa.mil/	view source profile
31	tsa.gov	3,319	html https://www.tsa.gov/	view source profile
32	grants.gov	3,516	html https://grants.gov/	view source profile
33	ready.gov	3,801	html https://www.ready.gov/	view source profile
34	uscourts.gov	3,817	html https://www.uscourts.gov/	view source profile
35	fws.gov	3,859	html https://www.fws.gov/contact-us	view source profile
36	medlineplus.gov	4,010	html https://medlineplus.gov/	view source profile
37	fedramp.gov	4,061	html https://www.fedramp.gov/	view source profile
38	fec.gov	4,077	html https://www.fec.gov/	view source profile
39	uscis.gov	4,140	js https://www.uscis.gov/sites/default/…ZWv1CR9fgRnT-gz5z8O9uJe	view source profile
40	health.gov	4,249	html https://health.gov/	view source profile
41	fema.gov	4,359	html https://www.fema.gov/	view source profile
42	boem.gov	4,426	html https://www.boem.gov/	view source profile
43	acquisition.gov	4,494	html https://www.acquisition.gov/	view source profile
44	ojp.gov	4,548	html https://ojp.gov/	view source profile
45	data.gov	4,599	html https://data.gov/	view source profile
46	medicare.gov	4,637	html https://www.medicare.gov/	view source profile
47	acl.gov	5,664	html https://acl.gov/	view source profile
48	llnl.gov	5,931	html https://www.llnl.gov/	view source profile
49	opm.gov	6,050	html https://www.opm.gov/	view source profile
50	ahrq.gov	6,677	html https://www.ahrq.gov/	view source profile

How it appears in the source

From cdc.gov (html):

t">  		<div class="cdc-site-gov-notice__header">  			<div>  				<img aria-hidden="true" class="usa-banner__header-flag" src="/TemplatePackage/5.0/img/uswds/us_flag_small.png" alt="" width="16" height=

See every site: search for usa-banner

Questions about finding U.S. Web Design System (USWDS)

How does PageSourceSearch know a website uses U.S. Web Design System (USWDS)?: By the source itself: USWDS sites show the official government banner, which is marked up with the usa-banner class. 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 U.S. Web Design System (USWDS)?: No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of about 28,720 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 U.S. Web Design System (USWDS) 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 usa-banner with wp-content/plugins/ lists the WordPress sites that use U.S. Web Design System (USWDS).

Websites using U.S. Web Design System (USWDS)

How is U.S. Web Design System (USWDS) detected?

Top 50 websites using U.S. Web Design System (USWDS)

How it appears in the source

Questions about finding U.S. Web Design System (USWDS)

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