# Browser Support

> Part of mCSS (mcss.dev). Rendered page: https://mcss.dev/docs/browser-support

**mCSS targets [Baseline](https://web.dev/baseline) 2024**.

It uses cascade layers (`@layer`), nesting, `:has()`, and other modern CSS features natively, with no polyfills. In practice that means the versions of Chrome, Edge, Firefox, and Safari that shipped late 2024 and after:

| Browser        | Version |
| -------------- | ------- |
| Chrome         | 130+    |
| Edge           | 130+    |
| Firefox        | 132+    |
| Safari (+ iOS) | 18.2+   |

If you install mCSS with the [PostCSS option](/docs/installation#option-3-compiled-via-postcss), it is possible to modify mCSS browser support via the `.browserslistrc` file. Using a different target, `postcss-preset-env` will start polyfilling the newer features. But it's not recommended: it will create file bloat and it's not foolproof. Some features can break in the process. (See [this blog post](/blog/postcss-setup-for-mcss) for details on what can break when changing the default browser support.)