Created attachment 90479 [details] Test case (can serve as layout test) The innerHTML property of a shadow root node currently is undefined. Attaching a test case/future layout test.
I don’t think it is a slam dunk that ShadowRoots will be exposed to anyone who would want innerHTML (ie JavaScript.) So I think this bug needs to be postponed for now.
ShadowRoot does not define innerHTML, so we won’t implement this. <http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#api-shadow-root>