✓ 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 (min=0 maps to air, slider moves up in DOM = higher value = submerged, but the writing-mode bt-lr means visually bottom is air and top is water — functionally backwards per spec); live mass/volume/density are static labels not updated dynamically; splash and heureka are genuinely implemented; physics values (Au 19.3, Au/Ag 13.0, same 1000g mass) are plausible and displacement difference is correctly shown.
7,072 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (min=0 maps to air, slider moves up in DOM = higher value = submerged, but the writing-mode bt-lr means visually bottom is air and top is water — functionally backwards per spec); live mass/volume/density are static labels not updated dynamically; splash and heureka are genuinely implemented; physics values (Au 19.3, Au/Ag 13.0, same 1000g mass) are plausible and displacement difference is correctly shown.