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JavaScript libraries

Polyfill.io (compromised CDN) usage 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.ukComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)SentryFastly
136,588stevenage.gov.ukcdnjsMicrosoft ClarityCivic Cookie ControlGoogle FontsGoogle Tag ManagerSlickZengenti Zengenti Ltd.
153,936cheshirewestandchester.gov.ukCivic Cookie ControlGoogle Tag ManagerReciteMeSwiperVarnishZengenti Zengenti Ltd.
168,545homify.co.ukBunny CDNcdnjsGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Google Tag ManagerjQuery 2.2.4Amazon Web Services
182,600uhs.nhs.ukVarnishZengenti Zengenti Ltd.
279,973krispykreme.co.ukAdobe FontsBootstrapcdnjsGoogle MapsGoogle Tag ManagerHotjarCloudflare
294,348chatgpt.org.ukGoogle AdSenseBloggerBootstrap 5.1.3Google Funding ChoicesGoogle FontsjsDelivrGoogle Cloud
394,582haart.co.ukAdobe FontsBootstrap 3.3.7Civic Cookie ControlFont AwesomeGoogle FontsGoogle Tag ManagerMicrosoft Azure
426,259pearsonschoolsandfecolleges.co.ukAkamai Bot ManagerAkamaiOneTrustVarnishVWOAmazon Web Services
503,618barb.co.ukBootstrapcore-jsFont AwesomeGoogle Analytics 4Google FontsGutenberg blocksAmazon Web Services
559,651guardianunlimited.co.ukComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)SentryAmazon Web Services

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

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