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 10,010 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 10,010 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 2026-09-30 02:50:36 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	ftc.gov	327	html https://consumer.ftc.gov/articles/free-credit-reports	view source profile
10	usgs.gov	341	html https://www.usgs.gov/	view source profile
11	energy.gov	452	html https://www.energy.gov/	view source profile
12	bls.gov	469	html https://data.bls.gov/dataQuery/search	view source profile
13	bea.gov	551	html https://bea.gov/	view source profile
14	usaspending.gov	843	js https://www.usaspending.gov/app.e713870c62edc48b3469.js	view source profile
15	blm.gov	868	html https://www.blm.gov/	view source profile
16	census.gov	1,035	html https://www.census.gov/	view source profile
17	dol.gov	1,186	html https://beta.dol.gov/about/freedom250	view source profile
18	epa.gov	1,250	html https://www.epa.gov/	view source profile
19	cisa.gov	1,468	html https://www.cisa.gov/	view source profile
20	ic3.gov	1,775	html https://www.ic3.gov/	view source profile
21	eeoc.gov	1,916	html https://www.eeoc.gov/	view source profile
22	nps.gov	1,954	html https://www.nps.gov/aboutus/contactus.htm	view source profile
23	ada.gov	2,018	html https://www.ada.gov/	view source profile
24	mo.gov	2,052	html https://mo.gov/	view source profile
25	fdic.gov	2,147	html https://www.fdic.gov/	view source profile
26	fincen.gov	2,202	html https://www.fincen.gov/	view source profile
27	nsf.gov	2,252	html https://www.nsf.gov/	view source profile
28	gao.gov	2,255	js https://www.gao.gov/assets/js/js_bCl…JpXmrsG9958p7Jj5DakGk8A	view source profile
29	cpsc.gov	2,346	html https://www.cpsc.gov/	view source profile
30	section508.gov	2,455	html https://www.section508.gov/	view source profile
31	cbp.gov	2,501	html https://www.cbp.gov/	view source profile
32	dhs.gov	2,614	html https://www.dhs.gov/	view source profile
33	pa.gov	2,630	html https://www.pa.gov/	view source profile
34	va.gov	2,805	html https://www.va.gov/	view source profile
35	gsa.gov	2,945	html https://www.gsa.gov/	view source profile
36	cancer.gov	3,182	html https://www.cancer.gov/	view source profile
37	darpa.mil	3,311	html https://www.darpa.mil/	view source profile
38	tsa.gov	3,319	html https://www.tsa.gov/	view source profile
39	cms.gov	3,324	html https://www.cms.gov/	view source profile
40	clinicaltrials.gov	3,338	js https://clinicaltrials.gov/main-NRLW7DCI.js	view source profile
41	grants.gov	3,516	html https://grants.gov/	view source profile
42	ready.gov	3,801	html https://www.ready.gov/	view source profile
43	uscourts.gov	3,817	html https://www.uscourts.gov/	view source profile
44	fws.gov	3,859	html https://www.fws.gov/contact-us	view source profile
45	medlineplus.gov	4,010	html https://medlineplus.gov/	view source profile
46	fedramp.gov	4,061	html https://www.fedramp.gov/	view source profile
47	fec.gov	4,077	html https://www.fec.gov/	view source profile
48	uscis.gov	4,140	js https://www.uscis.gov/sites/default/…iU8IO4RB1OZs7vX_ANXV-bE	view source profile
49	health.gov	4,249	html https://health.gov/	view source profile
50	healthcare.gov	4,251	html https://www.healthcare.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 10,010 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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