✓ 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 at top means crowns in air is correct conceptually, but the crown translateY moves crowns upward on increase, so dragging down raises crowns instead of lowering them into water); mass/volume/density live values are static HTML, not dynamically updated; no fall animation — crowns jump positions instantly; splash particles only trigger during the first 5% of slider travel rather than at water entry.
Slider direction is inverted (value=0 at top means crowns in air is correct conceptually, but the crown translateY moves crowns upward on increase, so dragging down raises crowns instead of lowering them into water); mass/volume/density live values are static HTML, not dynamically updated; no fall animation — crowns jump positions instantly; splash particles only trigger during the first 5% of slider travel rather than at water entry.