✓ 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 conceptually, but the slider renders with 0 at bottom due to bt-lr writing mode, making top physically equal to max/water), crown rendering logic is fragile and flickery with randomized water chars regenerated every frame, and splash particles are instantiated but never rendered to the ASCII canvas.
Slider direction is inverted (value=0 at top = crowns in air is correct conceptually, but the slider renders with 0 at bottom due to bt-lr writing mode, making top physically equal to max/water), crown rendering logic is fragile and flickery with randomized water chars regenerated every frame, and splash particles are instantiated but never rendered to the ASCII canvas.