✓ 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
ASCII/text-art canvas is functional but visually primitive; slider direction is inverted (value=0 at bottom maps crowns to top/air, but the vertical slider renders with 0 at bottom and 100 at top so dragging up = more submerged = inverted expectation); physics values are plausible but buoyancy is displayed in 'N' without multiplying by g (1 mL water = 0.0098 N, not 1 N).
ASCII/text-art canvas is functional but visually primitive; slider direction is inverted (value=0 at bottom maps crowns to top/air, but the vertical slider renders with 0 at bottom and 100 at top so dragging up = more submerged = inverted expectation); physics values are plausible but buoyancy is displayed in 'N' without multiplying by g (1 mL water = 0.0098 N, not 1 N).