Reproduce visual or interactive defects whose correctness depends on browser rendering, timing, viewport, input sequence, animation state, computed layout, or performance before fixing them. Use this whenever an animation, motion, responsive layout, scroll, resize, drag, hover, focus, visual transition, View Transition, Motion/FLIP, clipping, blur, jank, or "it looks wrong" report cannot be conclusively proven from data, unit tests, or static code reading alone.
