✓ 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
Physics values are correct (1000g each, gold 19.3 g/cm³ vs alloy 13.0 g/cm³, proportional displacement), but the slider direction is inverted (value=0 at top maps to crowns in air, which is technically correct orientation, but the writing-mode/appearance makes the slider render with 0 at top meaning crowns go INTO water as you push UP — inverted UX), fall/splash animations are stubbed out but never render in the ASCII output, and the "particle" system never actually draws particles anywhere.
Physics values are correct (1000g each, gold 19.3 g/cm³ vs alloy 13.0 g/cm³, proportional displacement), but the slider direction is inverted (value=0 at top maps to crowns in air, which is technically correct orientation, but the writing-mode/appearance makes the slider render with 0 at top meaning crowns go INTO water as you push UP — inverted UX), fall/splash animations are stubbed out but never render in the ASCII output, and the "particle" system never actually draws particles anywhere.