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JavaScript libraries

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

Polyfill.io (compromised CDN) runs on 0.2% of UK websites in our sample (18 of 11,909). Market share by country, top sites using it and technologies it is…

0.2%
Share in United Kingdom
18 / 11,909
0
sites in Tranco top 1K
1 in top 10K
#424,399
median Tranco rank
Tranco
<0.1%
Among local business websites
8 / 21,114
11
frequent companions
Google Marketing Platform (DV360/CM360)

By market

  1. United Kingdom0.2%18
  2. Global<0.1%32
  3. Netherlands0.1%11
  4. Italy<0.1%4
  5. Spain<0.1%2
  6. Japan<0.1%10
  7. Latin America<0.1%15

Trend

Often used with

  1. Google Marketing Platform (DV360/CM360)Advertising & pixels44%×9.1
  2. Google Publisher Tag (Ad Manager)Advertising & pixels44%×11.9
  3. ComscoreAnalytics39%×33.1
  4. SentryMonitoring & RUM39%×38.6
  5. VarnishWeb servers28%×5.2
  6. Google Tag ManagerTag managers28%
  7. Google FontsWeb fonts28%
  8. BootstrapCSS frameworks28%
  9. Civic Cookie ControlCookie consent (CMP)22%×8.3
  10. cdnjsCDN17%

Top sites using Polyfill.io (compromised CDN)

TrancoSiteAlso usesHosting
2,476guardian.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Fastly
115,157cambridgeshire.gov.uk Microsoft ClarityCivic Cookie ControlGoogle FontsPlausibleVarnishVimeo Zengenti
149,868homify.co.uk Bunny CDNcdnjsGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Google Tag ManagerjQuery 2.2.4 Amazon Web Services
158,353cheshirewestandchester.gov.uk Civic Cookie ControlGoogle Tag ManagerReciteMeSwiperVarnish Zengenti
200,517uhs.nhs.uk Varnish Zengenti
239,462stevenage.gov.uk cdnjsMicrosoft ClarityCivic Cookie ControlGoogle FontsGoogle Tag ManagerSlick Zengenti
310,407krispykreme.co.uk Adobe FontsBootstrapcdnjsGoogle MapsGoogle Tag ManagerHotjar Cloudflare
311,100chatgpt.org.uk Google AdSenseBloggerBootstrap 5.1.3Google Funding ChoicesGoogle FontsjsDelivr Google Cloud
414,495pearsonschoolsandfecolleges.co.uk Akamai Bot ManagerAkamaiOneTrustVarnishVWO Amazon Web Services
434,304haart.co.uk Adobe FontsBootstrap 3.3.7Civic Cookie ControlFont AwesomeGoogle FontsGoogle Tag Manager Microsoft Azure
511,913barb.co.uk Bootstrapcore-jsFont AwesomeGoogle Analytics 4Google FontsGutenberg blocks Amazon Web Services
597,581guardianunlimited.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Amazon Web Services
673,245booksunlimited.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Amazon Web Services
678,227ashes.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Amazon Web Services
691,361cipdawards.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Amazon Web Services
695,024cipd-awards.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Amazon Web Services
717,809commentisfree.co.uk ComscoreGoogle Marketing Platform (DV360/CM360)Google Publisher Tag (Ad Manager)Sentry Amazon Web Services
909,920connectec.uk BootstrapCloudflareGoogle Analytics 4Swiper Cloudflare

Our crawler: 11,909 sites · United Kingdom · updated 23 Oct 2026 · Methodology

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