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has-selector

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Use when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may replace the JavaScript entirely.

skills/has-selector/SKILL.md

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# Use :has() to style parent elements based on their descendants

Before :has(), styling a parent based on its children required JavaScript: detecting state, toggling classes, and keeping DOM and styles in sync. This created coupling between styling logic and application logic. :has() moves that relationship back into CSS where it belongs, reducing JavaScript complexity, eliminating class-toggling boilerplate, and making styling intent readable in the stylesheet itself.

## Quick Reference

- :has() selects an element when a matching descendant exists inside it
- It is the parent selector CSS has needed for decades
- Baseline support since late 2023 — all major browsers include it
- Avoid complex :has() selectors in hot reflow paths — they can affect layout performance

## Check

Look for patterns in this code where JavaScript toggles a class on a parent element based on the state or content of a child element. These are candidates for replacement with :has().
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