✓ 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 (min=0 top=air is correct semantically but the vertical range input renders with 0 at bottom by default, meaning dragging down goes toward air not water, contradicting the "0=Luft, 100=Voll" tip placement); physics values (Au 19.3, Ag+Au 10.5 g/cm³, equal 1000g mass) are accurate and the ASCII-art dual-tank visualization with live readouts, splash effects, and Heureka banner is impressively complete for a pure-text renderer.
Slider direction is inverted (min=0 top=air is correct semantically but the vertical range input renders with 0 at bottom by default, meaning dragging down goes toward air not water, contradicting the "0=Luft, 100=Voll" tip placement); physics values (Au 19.3, Ag+Au 10.5 g/cm³, equal 1000g mass) are accurate and the ASCII-art dual-tank visualization with live readouts, splash effects, and Heureka banner is impressively complete for a pure-text renderer.