Re: [w3c/webcomponents] Support `>>>` combinator in static profile (#78)

> Well, there is a subtle semantics difference. We’re essentially checking whether :matches(selector) is true or not for each element, and collecting elements that do match so we’re not scope-matching a selectors string but instead we’re matching a selector against an element which uses a different scoping object. This is because using a node from different trees as the scope doesn’t make sense in evaluating a selector as well as for the implementation simplicity.
>
> We’re adopting this API in some Safari code for now, and if this turns out to be useful, we’d make a more refined proposal.

@rniwa do you have any updates of how this is going in Safari?

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