[reference-target-basics.html]
[ShadowRoot.referenceTarget defaults to empty string when shadow is created declaratively]
expected: FAIL
[ shadowrootreferencetarget sets referenceTarget on shadow root]
expected: FAIL
[ShadowRoot.referenceTarget defaults to empty string when shadow is created imperatively]
expected: FAIL
[ShadowRootInitDict can be used to set referenceTarget on shadow root]
expected: FAIL