Polyfill.io is a service which makes web development less frustrating by selectively polyfilling just what the browser needs. Polyfill.io reads the User-Agent header of each request and returns polyfills that are suitable for the requesting browser.

Polyfill.io documentation is on the website.

Read our contributing guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes.

Polyfill.io is licensed under the terms of the MIT license. Contributors must accept our contribution terms.