Why it matters
A branded selection color is a small detail that signals care; default blue often clashes with the palette.
How to fix it
Style ::selection with a subtle brand tint.
Example
::selection { background: var(--brand-subtle); color: var(--fg); }More design rules
void design reports 19 rules in this category. Measured design heuristics from computed styles: font families, type scale, line length, palette and accent sprawl, spacing grid, radius sprawl, dark mode and the tells of generated UI.
gradient-textGradient-filled heading textpurple-gradientPurple/indigo gradient backgroundemoji-iconsEmoji used as iconsspacing-off-gridSpacing values are off the 4px gridradius-sprawlToo many different corner radiino-dark-modeNo dark mode supportcolor-scheme-missingcolor-scheme is not declaredhorizontal-overflowPage scrolls horizontally at 375px