✓ 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
Solid ASCII-art physics demo with correct Archimedes values and rising water levels, but slider direction is inverted (min=0 at top means air, but the slider_vertical orientation renders bottom=0 in most browsers, making it ambiguous/incorrect), mass/volume/density panels are static (not live), and there is no fall animation — the crown jumps position rather than animating.
Solid ASCII-art physics demo with correct Archimedes values and rising water levels, but slider direction is inverted (min=0 at top means air, but the slider_vertical orientation renders bottom=0 in most browsers, making it ambiguous/incorrect), mass/volume/density panels are static (not live), and there is no fall animation — the crown jumps position rather than animating.