✓ 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 (sliding up raises water/submerges crowns, but semantically the slider label says "Wasser-Level" and top means fully submerged rather than crowns in air); gilded crown uses a hardcoded volume of 5.81 cm³ attributed to silver but silver density should yield ~4.76 cm³ — the density inconsistency (8.61 g/cm³ labeled as silver-based) is misleading, and both crowns submerge at identical rates despite different volumes, so displacement differential is only cosmetic.
Slider direction is inverted (sliding up raises water/submerges crowns, but semantically the slider label says "Wasser-Level" and top means fully submerged rather than crowns in air); gilded crown uses a hardcoded volume of 5.81 cm³ attributed to silver but silver density should yield ~4.76 cm³ — the density inconsistency (8.61 g/cm³ labeled as silver-based) is misleading, and both crowns submerge at identical rates despite different volumes, so displacement differential is only cosmetic.