✓ 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-based implementation with correct physics (gold 19.4 g/cm³, gilded 8.0 g/cm³, same 1000g mass) and live data readouts, but the slider direction is inverted (value=0 places crowns at top/air, yet the slider thumb starts at bottom per vertical CSS writing-mode rendering), there is no smooth fall animation between frames (position jumps instantly), and the water-level rise is only cosmetic/numerical rather than visually prominent in the ASCII grid.
Solid ASCII-based implementation with correct physics (gold 19.4 g/cm³, gilded 8.0 g/cm³, same 1000g mass) and live data readouts, but the slider direction is inverted (value=0 places crowns at top/air, yet the slider thumb starts at bottom per vertical CSS writing-mode rendering), there is no smooth fall animation between frames (position jumps instantly), and the water-level rise is only cosmetic/numerical rather than visually prominent in the ASCII grid.