Cross-Origin Resource Sharing is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources. Also known as CORS.

Learning resources on MDN

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Browser support (view on caniuse.com)

• Chrome 4 Released on 2010-01-25
• Chrome Android 18 Released on 2012-06-27
• Edge 12 Released on 2015-07-29
• Firefox 3.5 Released on 2009-06-30
• Firefox for Android 4 Released on 2011-03-29
• Safari 4 Released on 2009-06-08
• Safari on iOS 3.2 Released on 2010-04-03

View web-platform-tests results for this feature - View the feature source file (dist) - Edit the feature - Report an issue about this feature