✓ 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 means crowns in air is correct labelling, but native vertical range inputs render with 0 at bottom, so top of slider actually outputs low values meaning crowns stay high — directionality is browser-dependent and likely wrong on most browsers); mass/volume/density are static HTML labels rather than live dynamic span values, failing the "live" requirement for three of the four metrics.
Slider direction is inverted (value=0 at top means crowns in air is correct labelling, but native vertical range inputs render with 0 at bottom, so top of slider actually outputs low values meaning crowns stay high — directionality is browser-dependent and likely wrong on most browsers); mass/volume/density are static HTML labels rather than live dynamic span values, failing the "live" requirement for three of the four metrics.