Re: [w3c/webcomponents] Support Custom Pseudo-elements (#300)

Perhaps there is value in styling both parts and states, and thus if we want to be sure CSS-ishly correct, there may need to be both shadow pseudo-elements and shadow pseudo-classes (for states). I would suggest they could be named ::part() and :state(). You'd target the active image with ::part(image):state(active). Having shadow pseudo-classes would also allow defining styling for custom states of the whole custom element, if pre-defined pseudo-classes like :active and :hover are not enough.

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