✓ 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
Solid ASCII-art implementation with correct physics (same mass, density 19.3 vs 13.0, proportional displacement) and working heureka trigger, but the slider direction is inverted (value=0 is labeled "Hoch"/top yet maps to crown fully above water which is correct label-wise but the `direction: rtl` + vertical slider with min=0 at top actually renders 0 at bottom in most browsers, making direction ambiguous/unreliable), and there is no smooth fall animation — crowns teleport discretely rather than falling.
Solid ASCII-art implementation with correct physics (same mass, density 19.3 vs 13.0, proportional displacement) and working heureka trigger, but the slider direction is inverted (value=0 is labeled "Hoch"/top yet maps to crown fully above water which is correct label-wise but the `direction: rtl` + vertical slider with min=0 at top actually renders 0 at bottom in most browsers, making direction ambiguous/unreliable), and there is no smooth fall animation — crowns teleport discretely rather than falling.