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Well, great sometimes. Not great if you don't trust a random 3rd party to host essential client-side code for you or if you don't feel like running yet another, maybe unsupported in the future, service for the next X years.

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You can always self-host it: https://github.com/financial-times/polyfill-service

True. We have an "if IE then emit polyfill.io <script> tag" call in the backend, which limits the security surface area to IE and also prevents an otherwise unnecessary extra HTTP request (we only use it for Intl). We feel that's a reasonable middle ground.

If I'd use it for all polyfills (which we should maybe consider!), we'd likely self-host the service.

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