305873 2026-01-20 14:12:14 -0800 REGRESSION(304761@main): wpt /uievents/mouse/mouseevent_move_button.html, /uievents/mouse/synthetic-mouse-enter-leave-over-out-button-state-after-target-removed.tentative.html?buttonType=MIDDLE&button=1&buttons=4 2026-01-20 14:13:20 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=280755 InRadar P2 Normal --- 1 gsnedders webkit-unassigned a_protyasha lily_spiniolas webkit-bug-importer oldest_to_newest 2173470 0 gsnedders 2026-01-20 14:12:14 -0800 See: https://wpt.fyi/results/?q=exists%28safari%3Apass%7Csafari%3Aok%29%20and%20exists%28safari%3A%21pass%26safari%3A%21ok%29%20and%20%28path%3A%2Fuievents%2Fmouse%2Fmouseevent_move_button.html%20or%20path%3A%2Fuievents%2Fmouse%2Fsynthetic-mouse-enter-leave-over-out-button-state-after-target-removed.tentative.html%20or%20path%3A%2Fwebdriver%2Ftests%2Fclassic%2Fperform_actions%2Fpointer_mouse.py%29&run_id=6253230603632640&run_id=6320828422815744&run_id=6309617283104768&run_id=6221924922556416&run_id=6194340293771264 Notably this includes /uievents/mouse/synthetic-mouse-enter-leave-over-out-button-state-after-target-removed.tentative.html?buttonType=MIDDLE&button=1&buttons=4 which is part of Interop 2025. This regressions between STP 234 and STP 235 bisects down to 304761@main. 2173471 1 webkit-bug-importer 2026-01-20 14:12:20 -0800 <rdar://problem/168535356>