It was decided recently that PointerEvents shouldn't inherit these non-standard and inconsistent values from MouseEvents when we have better (standard and consistent) alternatives (.target and .relatedTarget).
https://github.com/w3c/pointerevents/issues/167
We should fix Chrome accordingly.
(For MouseEvents, see Issue 692709.)
Comment 1 by mustaq@chromium.org
, Apr 11 2018