✓ 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, but orientation puts high values at bottom, yet the CSS writing-mode trick may render inconsistently across browsers); displaced volume calculation is broken — `calculateDisplacedVolume` computes a nonsensical ratio using hardcoded constant 50/100 rather than actual submerged depth, causing near-zero or wrong displacement readings throughout most of the range.
Slider direction is inverted (value=0 at top means crowns in air, but orientation puts high values at bottom, yet the CSS writing-mode trick may render inconsistently across browsers); displaced volume calculation is broken — `calculateDisplacedVolume` computes a nonsensical ratio using hardcoded constant 50/100 rather than actual submerged depth, causing near-zero or wrong displacement readings throughout most of the range.