Re: [webcomponents] Support Custom Pseudo-elements (#300)

> There's no specificity issues to iron out - It Just Works™.

@tabatkins, yeah I think you're right. I'd originally imagined a situation where element-author-defined pseudo-class rules would trump `@apply`-ed rules (inside a selector without the pseudo-classes), but that issue could easily be solved by moving the `@apply` declaration to after all rules with pseudo-classes.

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