✓ 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 (label says "Eintauchen ↓" at top but value=0 maps to crowns in air at top, which is actually correct mechanically but the label layout is confusing; more critically, mass/volume/density values are static in the DOM rather than dynamically updated, and there is no fall animation or splash — just ASCII characters shifting with random water-tile flicker as a poor substitute.
Slider direction is inverted (label says "Eintauchen ↓" at top but value=0 maps to crowns in air at top, which is actually correct mechanically but the label layout is confusing; more critically, mass/volume/density values are static in the DOM rather than dynamically updated, and there is no fall animation or splash — just ASCII characters shifting with random water-tile flicker as a poor substitute.