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Mouse events should be targeted to nearest Element, in general parentNode. But (1) what if ShadowRoot has just textnodes as children? Should the ShadowRoot itself be in the path? I think not. Hit testing should just target the host. (2) what if a textnode is distributed? Should the event propagate through the Shadow DOM? I think yes. In Gecko I'll make the textnode -> some_element to use the nearest Element in the final flattened tree.
Moved to https://github.com/w3c/webcomponents/issues/131