✓ 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 is inverted (value=0 at top means crowns in air is correct by label, but the writing-mode/appearance means the physical thumb position is inverted — slider drags downward to increase value yet labels say OBEN at bottom of DOM, making UX confusing); ASCII-art rendering is functional but fall animation is absent (crowns snap rather than animate falling), and the Heureka trigger has a broken reference to undeclared `depthPercent` in the event listener.
Slider is inverted (value=0 at top means crowns in air is correct by label, but the writing-mode/appearance means the physical thumb position is inverted — slider drags downward to increase value yet labels say OBEN at bottom of DOM, making UX confusing); ASCII-art rendering is functional but fall animation is absent (crowns snap rather than animate falling), and the Heureka trigger has a broken reference to undeclared `depthPercent` in the event listener.