This is a followup to bug 1316236, basically. Most of the CSSWG discussion on this is here: https://github.com/w3c/csswg-drafts/issues/413#issuecomment-537729118 Though also see subsequent comments. It looks like the spec may never have been changed (note that the issue was reopened).
Bug 1630441 Comment 1 Edit History
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This is a followup to bug 1316236, basically. Most of the CSSWG discussion on this is here: https://github.com/w3c/csswg-drafts/issues/413#issuecomment-537729118 Though also see subsequent comments, and note that the issue was reopened...