✓ 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
Mass/volume/density values are hardcoded static text rather than live-updating data bindings, so only displaced water is truly "live"; splash drops are appended to document.body with fixed positions that likely misalign visually, and the crown SVG positioning uses absolute offsets relative to tank-wrapper without proper above-water staging.
Mass/volume/density values are hardcoded static text rather than live-updating data bindings, so only displaced water is truly "live"; splash drops are appended to document.body with fixed positions that likely misalign visually, and the crown SVG positioning uses absolute offsets relative to tank-wrapper without proper above-water staging.