The test at imported/w3c/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse.html is flaky.
We must ensure that pointer events and their matching mouse events share the same timestamp.
I don't see any wording in the spec that timestamps should be the same for pointer events and compatibility mouse events. I've raised two issues to figure out what the deal is, one on the spec and one on the WPT test: https://github.com/w3c/pointerevents/issues/284 https://github.com/web-platform-tests/wpt/issues/17016
Created attachment 370749 [details] Patch
Comment on attachment 370749 [details] Patch Clearing flags on attachment: 370749 Committed r245820: <https://trac.webkit.org/changeset/245820>
All reviewed patches have been landed. Closing bug.
<rdar://problem/51188761>