— 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
Completely unrelated to the prompt — shows a generic single-object buoyancy demo with no crowns, no two-crown comparison, no vertical slider controlling submersion, no live mass/volume/displaced-water readouts, and no Heureka animation; the only prompt requirement met is being a self-contained file.
Completely unrelated to the prompt — shows a generic single-object buoyancy demo with no crowns, no two-crown comparison, no vertical slider controlling submersion, no live mass/volume/displaced-water readouts, and no Heureka animation; the only prompt requirement met is being a self-contained file.