CSS custom functions are a gamechanger. Here are 5 really useful examples.

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CSS custom functions using the new @function rule have landed in Chrome 139, enabling developers to write reusable logic that accepts arguments and returns computed values. The article demonstrates five practical examples: a negation function for inverting values, an opacity function for creating transparent color variants, a fluid typography function that scales text responsively, a conditional border radius function that removes rounded corners near viewport edges, and a layout sidebar function for responsive grid layouts. These functions make CSS more organized and dynamic, similar to utility functions in JavaScript, and represent a significant step toward more powerful CSS capabilities with upcoming @mixin and @apply rules.

5 Useful CSS functions using the new @function rule

only good use for these is to lighten or darken a color

This is very cool, nested media queries within a function could potentially change how we write responsive CSS

<a href="https://yaireo.github.io/css-utility-functions" target="_blank" rel="noopener nofollow">https://yaireo.github.io/css-utility-functions</a>