✓ 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 (min=0 at top maps to air, but the label says ▲Luft/▼Wasser while the HTML slider's natural vertical orientation with bt-lr writing-mode may render bottom=0, so the mapping is ambiguous/unreliable); physics values are correct (19.3 vs 13.0 g/cm³, same 1000g mass), ASCII-art rendering is functional but the crown art has inconsistencies and the splash effect is minimal.
Slider direction is inverted (min=0 at top maps to air, but the label says ▲Luft/▼Wasser while the HTML slider's natural vertical orientation with bt-lr writing-mode may render bottom=0, so the mapping is ambiguous/unreliable); physics values are correct (19.3 vs 13.0 g/cm³, same 1000g mass), ASCII-art rendering is functional but the crown art has inconsistencies and the splash effect is minimal.