✓ 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 (label says "Tiefer" at top / "Höher" at bottom but value=0 starts crowns at top-air, yet slider drags up to increase value which moves crowns down — the semantic labeling is backwards); ASCII art rendering has alignment bugs and both crowns use identical Unicode symbols making them visually indistinct; no smooth fall animation, only instant positional jumps; splash effect is too sparse/random to be perceptible; physics values (gold 19.3, alloy 13.0 g/cm³, same 1000g mass) are correct and displacement scales properly.
Slider direction is inverted (label says "Tiefer" at top / "Höher" at bottom but value=0 starts crowns at top-air, yet slider drags up to increase value which moves crowns down — the semantic labeling is backwards); ASCII art rendering has alignment bugs and both crowns use identical Unicode symbols making them visually indistinct; no smooth fall animation, only instant positional jumps; splash effect is too sparse/random to be perceptible; physics values (gold 19.3, alloy 13.0 g/cm³, same 1000g mass) are correct and displacement scales properly.