feature: CORS status: use tags: polyfill kind: html polyfillurls:flXHR (requires crossdomain.xml)
CORS, or cross-origin resource sharing, enables a few things, but most notably cross-domain AJAX. 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.