This is a testharness.js-based test.
[FAIL] ShadowRoot.registry is null if not explicitly specified
assert_equals: expected (object) null but got (undefined) undefined
[FAIL] Attach the global registry to a shadow root
assert_equals: expected (object) object "[object CustomElementRegistry]" but got (undefined) undefined
[FAIL] Attach a non-global registry to a shadow root
Illegal constructor
[FAIL] Attach the same registry to multiple shadow roots
Illegal constructor
[FAIL] Attaching registry to shadow root can only be done during initialization
Illegal constructor
Harness: the test ran to completion.