This is a testharness.js-based test.
[FAIL] XPathNSResolver is cross-realm plain object without 'lookupNamespaceURI' property
  assert_equals: expected "object" but got "undefined"
[FAIL] XPathNSResolver is cross-realm plain object with non-callable 'lookupNamespaceURI' property
  assert_equals: expected "object" but got "undefined"
[FAIL] XPathNSResolver is cross-realm non-callable revoked Proxy
  assert_equals: expected "object" but got "undefined"
Harness: the test ran to completion.