This is a testharness.js-based test.
[FAIL] Transient top-level about:blank gets base url from creator = opener
  assert_equals: about:blank has creator's base URI expected "http://web-platform.test:8001/html/infrastructure/urls/base-url/initial-about-blank-baseURI.window.html" but got "about:blank"
[FAIL] Transient top-level about:blank gets base url from creator != opener
  assert_equals: about:blank has creator's base URI expected "http://www1.web-platform.test:8001/" but got "about:blank"
Harness: the test ran to completion.