✓ 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 (value=0/top = crowns in air maps correctly via lerp, but the vertical slider's visual top corresponds to min=0 which is the "air" state — actually borderline; the bigger flaw is the splash trigger fires continuously during partial submersion rather than once at entry, and the HEUREKA text overlaps the crown region awkwardly mid-scene.
Slider direction is inverted (value=0/top = crowns in air maps correctly via lerp, but the vertical slider's visual top corresponds to min=0 which is the "air" state — actually borderline; the bigger flaw is the splash trigger fires continuously during partial submersion rather than once at entry, and the HEUREKA text overlaps the crown region awkwardly mid-scene.