Re: [w3c/webcomponents] Shadow root z-index/stacking context behaviour in custom element (#672)

Yes I appreciate that from [this comment](https://github.com/w3c/webcomponents/issues/426#issuecomment-302538568), however neither Chrome or Safari currently support stacking contexts outside of the custom element itself unless using `position:fixed;` and the spec. doesn't mention the expected behaviour, so I am unable to raise a bug with the respective teams without clarification.

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