This is a wdspec test.
[FAIL] test_no_browsing_context
AssertionError: assert 'no such element' == 'no such window'
[FAIL] test_no_such_element_with_shadow_root
assert 200 == 404
[FAIL] test_web_reference[frame-WebFrame]
AssertionError: javascript error (500): javascript error: circular reference
[FAIL] test_web_reference[window-WebWindow]
AssertionError: javascript error (500): javascript error: circular reference
Harness: the test ran to completion.