✓ 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 maps to crowns in air at top, but the HTML input range with vertical orientation and direction:rtl makes max=bottom=water, which is correct in rendering but the semantic mapping via depthPct=value/100 means slider thumb up = low value = crowns in air, which is actually correct — however the CSS uses direction:rtl which flips it so top of slider = max value = crowns in water, making it inverted); no smooth fall animation (positions jump discretely per ASCII grid row); mass and density values are static, not live-updating.
Slider direction is inverted (value=0 maps to crowns in air at top, but the HTML input range with vertical orientation and direction:rtl makes max=bottom=water, which is correct in rendering but the semantic mapping via depthPct=value/100 means slider thumb up = low value = crowns in air, which is actually correct — however the CSS uses direction:rtl which flips it so top of slider = max value = crowns in water, making it inverted); no smooth fall animation (positions jump discretely per ASCII grid row); mass and density values are static, not live-updating.