✓ 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 (value=0 is crowns in air at top, but the crown descends as value increases — directionally this could be argued correct, however the water level logic decreases rather than increases with submersion, making the rising water level broken; mass/volume/density displays are static, not live-updating; no true fall animation exists, only instantaneous position jump.
Slider direction is inverted (value=0 is crowns in air at top, but the crown descends as value increases — directionally this could be argued correct, however the water level logic decreases rather than increases with submersion, making the rising water level broken; mass/volume/density displays are static, not live-updating; no true fall animation exists, only instantaneous position jump.