✓ 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 (hint labels say "▲ Luft / ▼ Wasser" but the HTML range input default orientation maps value=0 at bottom and value=100 at top in most browsers, making top=water and bottom=air); no continuous fall animation — crowns jump directly via slider with no independent drop sequence.
Slider direction is inverted (hint labels say "▲ Luft / ▼ Wasser" but the HTML range input default orientation maps value=0 at bottom and value=100 at top in most browsers, making top=water and bottom=air); no continuous fall animation — crowns jump directly via slider with no independent drop sequence.