Re: :host pseudo-class

On Mon, Apr 27, 2015 at 5:37 AM, L. David Baron <dbaron@dbaron.org> wrote:
> We haven't really used (in the sense of shipping across browsers)
> pseudo-elements before for things that are both tree-like (i.e., not
> ::first-letter, ::first-line, or ::selection) and not leaves of the
> tree.  (Gecko doesn't implement any pseudo-elements that can have
> other selectors to their right.  I'm not sure if other engines
> have.)
>
> I'd be a little worried about ease of implementation, and doing so
> without disabling a bunch of selector-related optimizations that
> we'd rather have.
>
> At some point we probably do want to have this sort of
> pseudo-element, but it's certainly adding an additional dependency
> on to this spec.

Are you saying :host accepts selectors to its right and they would
potentially result in a match? Even if that were the case it's still
unclear to me how a pseudo-class is justified. Or are you saying the
concept of a host element selector is problematic in general?


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