✓ 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 a vertical range input with slider-vertical renders value=0 at the bottom in most browsers, making top = fully submerged); fall animation is absent — crowns teleport rather than animate smoothly into the water.
Slider direction is inverted (min=0 at top maps to crowns in air, but a vertical range input with slider-vertical renders value=0 at the bottom in most browsers, making top = fully submerged); fall animation is absent — crowns teleport rather than animate smoothly into the water.