emilio said we probably don't have a bug filed for frame-backed pseudo-elements, so we should have one.
6 months ago
Cameron, do you know any other pseudo that is not backed by content and that we need to restyle, apart from the bullets and ::backdrop, which were taken care on bug 1364871? Otherwise I think we can close this.
Maybe ::first-letter/line counts as frame-backed? But that's for later... ::-moz-math-anonymous we don't have to worry about, since we don't give it any rules. How about ::-moz-inner-focus? We don't actually have a separate frame for that, we just resolve some style with it. For that matter, I don't know how Gecko would restyle that... That's all that stands out to me from nsCSSPseudoElementList.h.
Ok, let's close this then.