The baseline of a cell is defined as the baseline of the first in-flow line box in the cell, or the first in-flow table-row in the cell, whichever comes first.
Created attachment 397459 [details] Patch
Committed r260647: <https://trac.webkit.org/changeset/260647> All reviewed patches have been landed. Closing bug and clearing flags on attachment 397459 [details].
<rdar://problem/62317906>