✓ 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
Critical JavaScript bug: `sliderValue` is reassigned as a number inside `animate()` (shadowing the DOM element reference), causing a runtime TypeError crash that renders the entire simulation non-functional after the first frame.
Critical JavaScript bug: `sliderValue` is reassigned as a number inside `animate()` (shadowing the DOM element reference), causing a runtime TypeError crash that renders the entire simulation non-functional after the first frame.