Layout test fast/text/complex-initial-advance.html is failing on Mojave 10.14.4 due to what appears to be a change in text sizing. See the image diff here: https://build.webkit.org/results/Apple%20Mojave%20Debug%20WK1%20(Tests)/r243749%20(2877)/fast/text/complex-initial-advance-diffs.html
<rdar://problem/49539493>
Marked test as failing in https://trac.webkit.org/changeset/243768/webkit