✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns — Slider direction correct ✓ Full slider range — Fall animation ✓ Water displacement ✓ Rising water level — Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Slider direction is inverted (dragging down = submerging, top=air is correct by accident but thumb starts at top=0% which maps to crown in air — actually direction is OK structurally, but splash effects are ASCII noise rather than real animation, and there is no genuine fall animation; the crown teleports rather than animating.
Slider direction is inverted (dragging down = submerging, top=air is correct by accident but thumb starts at top=0% which maps to crown in air — actually direction is OK structurally, but splash effects are ASCII noise rather than real animation, and there is no genuine fall animation; the crown teleports rather than animating.