✓ 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 labeled "Luft" at top maps to air, but the vertical range input with writing-mode:vertical-lr/direction:rtl means dragging down increases value toward "Wasser" — direction logic is borderline, and there is no crown fall/transition animation, only instant repositioning; mass, volume, and density live values are static (hardcoded), not dynamically updated.
Slider direction is inverted (min=0 labeled "Luft" at top maps to air, but the vertical range input with writing-mode:vertical-lr/direction:rtl means dragging down increases value toward "Wasser" — direction logic is borderline, and there is no crown fall/transition animation, only instant repositioning; mass, volume, and density live values are static (hardcoded), not dynamically updated.