✓ 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 and displaced-water live-readouts are correct, but the slider direction is inverted (value=0/top = crowns in air maps correctly in intent but `crownDepth = (1-depthPercent)*WATER_HEIGHT` places crowns above water at slider top yet the ASCII rendering logic is unreliable), there are no fall or splash animations, and the ASCII-art container rendering has layout bugs (crown clipping, water-level confusion) that undermine the visual clarity of the demonstration.
Physics values and displaced-water live-readouts are correct, but the slider direction is inverted (value=0/top = crowns in air maps correctly in intent but `crownDepth = (1-depthPercent)*WATER_HEIGHT` places crowns above water at slider top yet the ASCII rendering logic is unreliable), there are no fall or splash animations, and the ASCII-art container rendering has layout bugs (crown clipping, water-level confusion) that undermine the visual clarity of the demonstration.