Re: [w3c/webcomponents] Provide a lightweight mechanism to add styles to a custom element (#468)

I simply agree with @emilio in this regard. From a Blink implementation standpoint, :element() just adds complexity. You potentially have specificity issues (:element(myelement) vs :element([attr]), do we have the specificity of the selector inside the pseudo class?). I don't know to which extent :element() would be clearer for authors. We already have e.g. universal selectors in shadow tree stylesheets which only applies to elements inside that shadow tree. I don't know if universal selectors in a stylesheet only applying to a custom element is any different.

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