Yes, that's right, but that's not our current behavior. We end up matching the global ::marker rules (and having that behavior would mean the following doesn't generate red markers). I agree that's wrong. However if we don't match rules like that, then `ProbePseudoElementStyle` will return null and thus we'll generate no marker at all. Even if it didn't, the UA rule for marker would not work: https://searchfox.org/mozilla-central/rev/0376cbf447efa16922c550da3bfd783b916e35d3/layout/style/res/ua.css#130 So I think the best behavior is making pseudo-elements don't create markers to begin with.
Bug 1544242 Comment 4 Edit History
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Yes, that's right, but that's not our current behavior. We end up matching the global ::marker rules. I agree that's wrong. However if we don't match rules like that, then `ProbePseudoElementStyle` will return null and thus we'll generate no marker at all. Even if it didn't, the UA rule for marker would not work: https://searchfox.org/mozilla-central/rev/0376cbf447efa16922c550da3bfd783b916e35d3/layout/style/res/ua.css#130 So I think the best behavior is making pseudo-elements don't create markers to begin with.