CORS

CORS, or cross-origin resource sharing, enables a few things, but most notably cross-domain AJAX.

Verdict

Safe to use

Category

HTML features

Browser support

Can I Use

Works in

all modern browsers

Should you use CORS in 2026?

All non-IE browsers have support for CORS. IE8 introduced [XDomainRequest][], so really only IE7 needs help with cross-domain files. Consider the flXHR polyfill or you can fall back to using a simple proxy.

[XDomainRequest]: https://developer.mozilla.org/en-US/docs/Web/API/XDomainRequest

Polyfills and fallbacks

flXHR (requires crossdomain.xml)

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