✓ 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 (top=air, bottom=water maps correctly in intent but `writing-mode: bt-lr` with `value=0` at top means increasing value goes downward which is correct, however both crowns share identical Y positions making them overlap rather than appear as two distinct separated objects, and there is no live displaced-water volume readout despite showing buoyancy).
Slider direction is inverted (top=air, bottom=water maps correctly in intent but `writing-mode: bt-lr` with `value=0` at top means increasing value goes downward which is correct, however both crowns share identical Y positions making them overlap rather than appear as two distinct separated objects, and there is no live displaced-water volume readout despite showing buoyancy).