[csswg-drafts] [css-pseudo-4] should CSSPseudoElement have a pseudo() method? (#3836)

heycam has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-pseudo-4] should CSSPseudoElement have a pseudo() method? ==
https://drafts.csswg.org/css-pseudo-4/#CSSPseudoElement-interface

You can get to the pseudo-element of an element with `Element.pseudo()`.  But some pseudos are defined to have other pseudos hanging off them, like with `::part(label)::before`.  Does `CSSPseudoElement` need its own `pseudo()` method?

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3836 using your GitHub account