[HostEnsureCanAddPrivateElement.window.html]
  [Same Origin: WindowProxy]
    expected: FAIL

  [Cross Origin (port): WindowProxy]
    expected: FAIL

  [Cross Origin (remote): WindowProxy]
    expected: FAIL

  [Same Origin + document.domain WindowProxy]
    expected: FAIL

  [Same Origin: Location]
    expected: FAIL

  [Cross Origin (remote): Location]
    expected: FAIL

  [Cross Origin: Location]
    expected: FAIL

  [Same Origin + document.domain: Location]
    expected: FAIL

  [(After document.domain set) Same Origin + document.domain: Location]
    expected: FAIL

  [(After document.domain set) Same Origin + document.domain WindowProxy does carry private fields after navigation]
    expected: FAIL

  [(After document.domain set) Local navigation (setdomain) Location]
    expected: FAIL

  [(After document.domain set) Local navigation (setdomain) WindowProxy does carry private fields after navigation]
    expected: FAIL