✓ 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
Physics values are correct (gold 19.3, gilded 8.5 g/cm³, same 1000g mass), but the ASCII-art rendering is minimal (single Unicode character per crown, no crown shape), the slider direction is inverted (label says "Hochziehen zum Eintauchen" = pull up to submerge, but HTML range sliders increase downward making the UX confusing), and there is no genuine fall animation — crowns jump position based on submergedPercent math rather than smoothly falling into water.
Physics values are correct (gold 19.3, gilded 8.5 g/cm³, same 1000g mass), but the ASCII-art rendering is minimal (single Unicode character per crown, no crown shape), the slider direction is inverted (label says "Hochziehen zum Eintauchen" = pull up to submerge, but HTML range sliders increase downward making the UX confusing), and there is no genuine fall animation — crowns jump position based on submergedPercent math rather than smoothly falling into water.