https://bugzilla.mozilla.org/show_bug.cgi?id=1381181
1381181 - Intermittent abs-pos/font-size-wrap.html == abs-pos/font-size-wrap-ref.html | image...
RESOLVED (a.beingessner) in Core - Graphics: WebRender. Last updated 2018-10-01.
font sizeintermittentabsposwrap