✓ 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 air, value=100 is water, but slider visual top maps to 0 on a bt-lr vertical range, so dragging up submerges — effectively backwards for UX); no fall animation or splash effects; ASCII-art rendering is functional but crude; physics values are plausible and Heureka triggers correctly at full submersion.
Slider direction is inverted (value=0 is air, value=100 is water, but slider visual top maps to 0 on a bt-lr vertical range, so dragging up submerges — effectively backwards for UX); no fall animation or splash effects; ASCII-art rendering is functional but crude; physics values are plausible and Heureka triggers correctly at full submersion.