The text-decoration-color property is currently animatable as a discrete property. This should not be the case, it should interpolate just like any other color type property.
<rdar://problem/72138361>
Created attachment 415780 [details] Patch
Committed r270597: <https://trac.webkit.org/changeset/270597> All reviewed patches have been landed. Closing bug and clearing flags on attachment 415780 [details].