GitHub - jquintozamora/polyfill-io-feature-detection: Feature detection in the browser before loading polyfill using services like polyfill.io
![Differential serving vs. polyfill service: How to best serve modern and legacy browsers | by Dong Chen | Medium Differential serving vs. polyfill service: How to best serve modern and legacy browsers | by Dong Chen | Medium](https://miro.medium.com/v2/resize:fit:1358/1*0QPjWi-YEJw6Czg7NHIonQ.png)
Differential serving vs. polyfill service: How to best serve modern and legacy browsers | by Dong Chen | Medium
![Kent C. Dodds 🌌 on X: "I saw this one coming. At PayPal, I wanted this but I knew we wouldn't be cool just loading a random script from another company so Kent C. Dodds 🌌 on X: "I saw this one coming. At PayPal, I wanted this but I knew we wouldn't be cool just loading a random script from another company so](https://pbs.twimg.com/media/GHRdaoyakAAKxLw.jpg)
Kent C. Dodds 🌌 on X: "I saw this one coming. At PayPal, I wanted this but I knew we wouldn't be cool just loading a random script from another company so
![Ghostery blocks downloads from polyfill.io · Issue #1426 · polyfillpolyfill/ polyfill-service · GitHub Ghostery blocks downloads from polyfill.io · Issue #1426 · polyfillpolyfill/ polyfill-service · GitHub](https://user-images.githubusercontent.com/56636/33988523-7deb43ea-e0bc-11e7-94db-047f943b2423.png)