<iframe>
works if its "shadow-host-including inclusive ancestor" is a document that has a browsing context. I.e., including when it does not end up in the flattened tree.
<iframe>
has a couple of major pain points when used in a shadow tree:
Window
object: <iframe> and Window's named properties WICG/webcomponents#145 These should probably not dig into the shadow tree, but that will require adjustments to various definitions around browsing contexts.<a href=test target=test>
should not cross boundaries.Paging @hayatoito @smaug---- @rniwa.
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4