✓ 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 = air, value=100 at bottom = water is logically correct for bt-lr writing mode BUT the crown appears from depth=0 upward meaning top of slider = no submersion which is actually correct — however the ASCII fall animation is absent; crowns snap instantly with no falling motion, and the splash particle system runs but never visibly renders inside the pre element since particle coordinates don't align with the grid logic.
Slider direction is inverted (value=0 at top = air, value=100 at bottom = water is logically correct for bt-lr writing mode BUT the crown appears from depth=0 upward meaning top of slider = no submersion which is actually correct — however the ASCII fall animation is absent; crowns snap instantly with no falling motion, and the splash particle system runs but never visibly renders inside the pre element since particle coordinates don't align with the grid logic.