In December 2012, ECMA International published the first edition of Standard ECMA-402, better known as the ECMAScript Internationalization API. This specification provides the framework to bring long overdue localization methods to ECMAScript implementations.

All modern browsers, except safari, have implemented his API. Intl.js fills the void of availability for this API. It will provide the framework as described by the specification, so that developers can take advantage of the native API in environments that support it, or Intl.js for legacy or unsupported environments.

Intl.js polyfill was recently added to the Polyfill service, which is developed and maintained by a community of contributors led by a team at the Financial Times. It is available thru cdn.polyfill.io domain, which routes traffic through Fastly, which makes it available with global high availability and superb performance no matter where your users are.

To use the Intl polyfill thru the Polyfill service just add one script tag in your page before you load or parse your own JavaScript:

<script src="https://cdn.polyfill.io/v1/polyfill.min.js?features=Intl.~locale.en"></script>

When specifying the features to use thru the polyfill service, you have to specify what locale, or locales to load along with the Intl polyfill for the page to function, in the example above we are specifying Intl.~locale.en, which means only en, but you could do something like this:

<script src="https://cdn.polyfill.io/v1/polyfill.min.js?features=Intl.~locale.fr,Intl.~locale.pt"></script>

note: the example above will load the polyf