Upgrade the web. Automatically.
The polyfill service selectively bundles browser polyfills based on the User-Agent header supplied in a request, with the intention of allowing JavaScript and CSS developers to use modern standards in legacy user agents that do not natively support the standard. Think of it like a pair of glasses for your aging browser.
Load the service before you load or parse your own JavaScript:
<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>The polyfill service is developed and maintained by a community of contributors led by a team at the Financial Times. It evolved from a previous service developed by Jonathan Neal, and our cdn.polyfill.io domain routes traffic through Fastly, which makes it available with global high availability and superb performance no matter where your users are.
