✓ 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 approach with correct physics (gold ρ=19.3, silver ρ=10.5, same mass) and live panel values, but the slider is inverted (value=0 maps to crowns in air at top, which is correct structurally, yet the vertical slider's visual thumb-up = low value = air is browser-dependent and unreliable), there is no smooth falling animation (crowns jump linearly with no physics-based drop), and the ASCII splash/wave effects are rudimentary tick-based rather than genuinely animated.
Solid ASCII-art approach with correct physics (gold ρ=19.3, silver ρ=10.5, same mass) and live panel values, but the slider is inverted (value=0 maps to crowns in air at top, which is correct structurally, yet the vertical slider's visual thumb-up = low value = air is browser-dependent and unreliable), there is no smooth falling animation (crowns jump linearly with no physics-based drop), and the ASCII splash/wave effects are rudimentary tick-based rather than genuinely animated.