✓ 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 (value=0 at top maps to crowns in air via crownLine logic, but the slider's writing-mode/appearance means the visual top is max=100/water, not min=0/air); splash particles are computed but never rendered to the DOM; fall animation is absent — crown position simply jumps without smooth frame-based motion.
Slider direction is inverted (value=0 at top maps to crowns in air via crownLine logic, but the slider's writing-mode/appearance means the visual top is max=100/water, not min=0/air); splash particles are computed but never rendered to the DOM; fall animation is absent — crown position simply jumps without smooth frame-based motion.