✓ 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 at top maps to crowns in air, which is correct mapping, but the label layout places "LUFT" at top and "WASSER" at bottom yet the slider renders bottom-up in vertical mode making the physical direction ambiguous/incorrect in practice); no smooth fall animation — crown jumps via discrete ASCII rows; splash effect is pseudo-random per render call (not time-based), producing flickering rather than genuine animation.
Slider direction is inverted (value=0 at top maps to crowns in air, which is correct mapping, but the label layout places "LUFT" at top and "WASSER" at bottom yet the slider renders bottom-up in vertical mode making the physical direction ambiguous/incorrect in practice); no smooth fall animation — crown jumps via discrete ASCII rows; splash effect is pseudo-random per render call (not time-based), producing flickering rather than genuine animation.