https://github.com/whatwg/html/issues/3959 describes how Location objects are not interoperable across browsers as well as some research as what browsers could align on here that would most likely be web-compatible and somewhat reasonable.

https://github.com/whatwg/html/pull/4076 describes the change to the HTML Standard needed for this and https://github.com/web-platform-tests/wpt/pull/13435 has tests.