✓ 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 in code (value=100 at top mapped to 0% immersion via `100 - slider.value`), meaning physically the top label says "Luft/Air" but the internal inversion logic combined with browser vertical-slider rendering makes the actual drag direction ambiguous/platform-dependent; all other features are solidly implemented with correct Archimedes physics, two distinct crowns, live data panels, rising water, splash particles, and Heureka animation.
Slider direction is inverted in code (value=100 at top mapped to 0% immersion via `100 - slider.value`), meaning physically the top label says "Luft/Air" but the internal inversion logic combined with browser vertical-slider rendering makes the actual drag direction ambiguous/platform-dependent; all other features are solidly implemented with correct Archimedes physics, two distinct crowns, live data panels, rising water, splash particles, and Heureka animation.