The #1 free and open source CDN built to make life easier for developers.

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Polyfill.io now available on cdnjs

Start using the service: https://cdnjs.cloudflare.com/polyfill

See the announcements from Cloudflare: https://blog.cloudflare.com/polyfill-io-now-available-on-cdnjs-reduce-your-supply-chain-risk + https://blog.cloudflare.com/automatically-replacing-polyfill-io-links-with-cloudflares-mirror-for-a-safer-internet.