No Bounce or Elastic Easing
NEVER: Let a UI element overshoot its final position: no `animate-bounce`, no animation named `bounce|elastic|wobble|jiggle|spring`, and no `cubic-bezier()` whose y1 or y2 falls outside `[-0.1, 1.1]`. Ease out with exponential curves (ease-out-quart / quint / expo).
Ease out with exponential curves and never let a UI element overshoot its final position
Bad
Good
Why it matters
The detector flags any animation-name matching bounce|elastic|wobble|jiggle|spring, Tailwind's animate-bounce, and — the precise part — any cubic-bezier() whose y1 or y2 falls outside the range [-0.1, 1.1], because a control point past the 0–1 band is exactly what overshoot is. Real objects decelerate into a stop; they do not sail past their destination and spring back.
Overshoot on a modal or a toast reads as dated and, on anything a user opens dozens of times a day, as broken. Note this is not a duplicate of "Easing Fits Subject", which only asks that a curve match its subject and never bans overshoot — this principle draws the hard line.