✓ 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 = air, max=100 at bottom = water is correct in label intent, but the vertical range input with writing-mode:vertical-lr + direction:rtl means visually dragging down increases value — this is actually correct, but no continuous fall animation exists; crowns teleport rather than animate between positions.
Slider direction is inverted (min=0 at top = air, max=100 at bottom = water is correct in label intent, but the vertical range input with writing-mode:vertical-lr + direction:rtl means visually dragging down increases value — this is actually correct, but no continuous fall animation exists; crowns teleport rather than animate between positions.