✓ 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
Mass/volume/density values are static (hardcoded in HTML, not live-updating), slider direction is ambiguous/browser-dependent due to CSS vertical flip relying on writing-mode+direction tricks that may not invert correctly, but physics values (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass) and displacement logic are sound.
Mass/volume/density values are static (hardcoded in HTML, not live-updating), slider direction is ambiguous/browser-dependent due to CSS vertical flip relying on writing-mode+direction tricks that may not invert correctly, but physics values (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass) and displacement logic are sound.