✓ 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 (writing-mode:vertical-lr + direction:rtl causes top=100%/water, bottom=0%/air), breaking the expected UX convention; everything else is impressively complete with correct physics, polished visuals, splash effects, and a theatrical Heureka overlay.
Slider direction is inverted (writing-mode:vertical-lr + direction:rtl causes top=100%/water, bottom=0%/air), breaking the expected UX convention; everything else is impressively complete with correct physics, polished visuals, splash effects, and a theatrical Heureka overlay.