[ShadowRoot-init-registry.tentative.html]
[ShadowRoot.registry is null if not explicitly specified]
expected: FAIL
[Attach the global registry to a shadow root]
expected: FAIL
[Attach a non-global registry to a shadow root]
expected: FAIL
[Attach the same registry to multiple shadow roots]
expected: FAIL
[Attaching registry to shadow root can only be done during initialization]
expected: FAIL