✓ 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 (slider min=0 at top maps to crowns in air, but the writing-mode/rtl CSS actually makes the visual top of the slider correspond to value 100, meaning bottom of slider = crowns in air), and there is a syntax error in the splash offset array literal (`−40` uses a unicode minus, not ASCII), breaking splash positioning; Heureka transform uses a non-standard transform-origin attribute that won't work on SVG elements.
Slider direction is inverted (slider min=0 at top maps to crowns in air, but the writing-mode/rtl CSS actually makes the visual top of the slider correspond to value 100, meaning bottom of slider = crowns in air), and there is a syntax error in the splash offset array literal (`−40` uses a unicode minus, not ASCII), breaking splash positioning; Heureka transform uses a non-standard transform-origin attribute that won't work on SVG elements.