Specification: https://html.spec.whatwg.org/multipage/browsers.html#the-origin-interface

To do so, add an Origin.webidl to https://github.com/servo/servo/tree/main/components/script_bindings/webidls which contains the IDL from the specification.

Then, implement the methods on OriginMethods using the same site implementation at

and same-origin can be done by comparing two origins with ==.

You can run the tests with ./mach test-wpt /html/browsers/origin/api/ and verify they are passing.