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Tyler's on-device verdict at3d1e91ea: better but not perfect. This probe actuates the shape of his input — small (12px) wheel deltas at slow (~32ms) cadence, no settling — and samples the tracked reading row's rect.top, scrollTop and mounted count EVERY rAF, so one-frame events are visible. Flags frames whose rowMove escapes the slow-wheel staircase envelope (reversal <= -3px, or shove >= 2*delta+3px), pairs escapes that cancel within 3 frames (one-frame flash of a deferred correction) vs unpaired (felt lurch), pure rect.top in the flag condition per the W4 framing. At tipb170680d(includes W1r3fe786ea4): Chromium 0 escapes / 3447 frames; WebKit 81 escapes / 1754 frames — 11 flash pairs (-27.5 shove then +28 correction one frame later) + 59 unpaired single-frame jumps of exactly 35px / 41px recurring every ~6 rows. Diagnostic, non-gating. Co-authored-by: Tyler Longwell <tlongwell@block.xyz> Signed-off-by: Tyler Longwell <tlongwell@block.xyz>