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JavaScript libraries

Polyfill.io (compromised CDN) market share in the UK

Polyfill.io (compromised CDN) runs on <0.1% of UK websites in our sample (11 of 11,322). Market share by country, top sites using it and technologies it is…

<0.1%
Share in United Kingdom
11 / 11,322
0
sites in Tranco top 1K
1 in top 10K
#279,973
median Tranco rank
Tranco
<0.1%
Among local business websites
10 / 20,305
9
frequent companions
Google Tag Manager

By market

  1. United Kingdom<0.1%11
  2. Global<0.1%24
  3. Netherlands0.1%9
  4. Italy<0.1%4
  5. Spain<0.1%2
  6. Japan<0.1%12
  7. Latin America<0.1%14

Trend

Often used with

  1. Google Tag ManagerTag managers45%
  2. VarnishWeb servers36%×7
  3. Google FontsWeb fonts36%
  4. BootstrapCSS frameworks36%
  5. cdnjsCDN27%×2.5
  6. Google Marketing Platform (DV360/CM360)Advertising & pixels27%×5.8
  7. Google Publisher Tag (Ad Manager)Advertising & pixels27%×7.8
  8. jQueryJavaScript libraries27%
  9. Civic Cookie ControlCookie consent (CMP)27%×9.6

Top sites using Polyfill.io (compromised CDN)

TrancoSiteAlso usesHosting
2,487guardian.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Fastly
136,588stevenage.gov.uk cdnjsMicrosoft ClarityCivic Cookie ControlGoogle FontsGoogle Tag ManagerSlick Zengenti Zengenti Ltd.
153,936cheshirewestandchester.gov.uk Civic Cookie ControlGoogle Tag ManagerReciteMeSwiperVarnish Zengenti Zengenti Ltd.
168,545homify.co.uk Bunny CDNcdnjsGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Google Tag ManagerjQuery 2.2.4 Amazon Web Services
182,600uhs.nhs.uk Varnish Zengenti Zengenti Ltd.
279,973krispykreme.co.uk Adobe FontsBootstrapcdnjsGoogle MapsGoogle Tag ManagerHotjar Cloudflare
294,348chatgpt.org.uk Google AdSenseBloggerBootstrap 5.1.3Google Funding ChoicesGoogle FontsjsDelivr Google Cloud
394,582haart.co.uk Adobe FontsBootstrap 3.3.7Civic Cookie ControlFont AwesomeGoogle FontsGoogle Tag Manager Microsoft Azure
426,259pearsonschoolsandfecolleges.co.uk Akamai Bot ManagerAkamaiOneTrustVarnishVWO Amazon Web Services
503,618barb.co.uk Bootstrapcore-jsFont AwesomeGoogle Analytics 4Google FontsGutenberg blocks Amazon Web Services
559,651guardianunlimited.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Amazon Web Services

Our crawler: 11,322 sites · United Kingdom · updated 13 Nov 2026 · Methodology

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