✓ 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 = crowns in air is correct numerically, but `writing-mode: bt-lr` with `slider-vertical` appearance means the physical top of the slider corresponds to max=100/water, not min=0/air); animation is ASCII-art only with no smooth fall motion, and the crown rendering logic has a flawed double-pass that can produce garbled lines at certain depths.
Slider direction is inverted (value=0 at top = crowns in air is correct numerically, but `writing-mode: bt-lr` with `slider-vertical` appearance means the physical top of the slider corresponds to max=100/water, not min=0/air); animation is ASCII-art only with no smooth fall motion, and the crown rendering logic has a flawed double-pass that can produce garbled lines at certain depths.