Harness status: OK

Found 7 tests

7 Pass
Pass	adoptNode() plain DocumentFragment (no host): adopts and returns it
Pass	adoptNode() template.content: adopts fragment + children, returns it
Pass	adoptNode() template.content into browsing-context document
Pass	adoptNode() shadow root: throws HierarchyRequestError
Pass	adoptNode() <template> element: content follows via template adopting steps
Pass	adoptNode() nested <template> elements: all owner documents update
Pass	appendChild() template.content: moves children, fragment ownerDocument stays