✓ 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
Water-rise calculation divides by an arbitrary "400" (container width in pixels, not area in cm²) making displaced-volume-to-water-rise mapping physically meaningless; mass/volume/density values are static SVG text rather than live dynamic displays; the custom drag slider works but lacks touch support and has no native input semantics.
Water-rise calculation divides by an arbitrary "400" (container width in pixels, not area in cm²) making displaced-volume-to-water-rise mapping physically meaningless; mass/volume/density values are static SVG text rather than live dynamic displays; the custom drag slider works but lacks touch support and has no native input semantics.