✓ 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 (min=0 at top maps to crowns in air, but HTML range inputs with bt-lr writing-mode still read top as min in most browsers, making the direction ambiguous/broken); mass, volume, and density values are hardcoded static text rather than live reactive values; no actual fall animation (crowns teleport linearly with no easing or drop motion); splash logic only fires on exact 5% slider increments, making it unreliable.
Slider direction is inverted (min=0 at top maps to crowns in air, but HTML range inputs with bt-lr writing-mode still read top as min in most browsers, making the direction ambiguous/broken); mass, volume, and density values are hardcoded static text rather than live reactive values; no actual fall animation (crowns teleport linearly with no easing or drop motion); splash logic only fires on exact 5% slider increments, making it unreliable.