✓ 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
Fully featured, visually polished SVG demo with correct physics (19.3 vs 13.0 g/cm³, same 1000g mass, proportional displacement), animated waves, splash particles, and Heureka reveal — minor flaw: mass/volume/density panel values are static (not dynamically recomputed), and the custom SVG slider lacks the accessibility/precision of a native range input.
10,750 output tokens · claude-opus-4-6 · end_turn
Fully featured, visually polished SVG demo with correct physics (19.3 vs 13.0 g/cm³, same 1000g mass, proportional displacement), animated waves, splash particles, and Heureka reveal — minor flaw: mass/volume/density panel values are static (not dynamically recomputed), and the custom SVG slider lacks the accessibility/precision of a native range input.