Sponsor of the Day:
Jerkmate
https://preset-env.cssdb.org/
PostCSS Preset Env - CSS Tools
PostCSS Preset Env lets you transform modern CSS so most browsers can understand, determining the polyfills you need based on the browsers you want.
env csspostcsspresettools
https://css-tricks.com/almanac/functions/e/env/
env() | CSS-Tricks
Sep 25, 2025 - The CSS env() function replaces environment variables into CSS. To be more precise, it is a way to insert user-agent-defined variables into your stylesheet.
env csstricks
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/env
env() CSS function - CSS | MDN
The env() CSS function can be used to insert the value of a user-agent defined environment variable into your CSS.
css function mdnenv
https://caniuse.com/?search=ciu/css-env-function
"ciu/css-env-function" | Can I use... Support tables for HTML5, CSS3, etc
use support tableshtml5 css3 etcciuenvfunction