https://drafts.csswg.org/css-text-decor-3/#fig-text-underline-position Our underlines jump around per element. Instead, they should be consistent across the entire decorating box.
<rdar://problem/30153310>
<rdar://problem/15044440>
*** Bug 190772 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 135353 ***