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+# PostCSS Nested Calc [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][PostCSS]
+
+[<img alt="npm version" src="https://img.shields.io/npm/v/@csstools/postcss-nested-calc.svg" height="20">][npm-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/nested-calc.svg" height="20">][css-url] [<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/workflows/test/badge.svg" height="20">][cli-url] [<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
+
+[PostCSS Nested Calc] lets you use nested `calc()` expressions following the [CSS Values and Units 4 specification].
+
+```pcss
+.example {
+	order: calc(1 + calc(2 * 2));
+}
+
+/* becomes */
+
+.example {
+	order: calc(1 + (2 * 2));
+	order: calc(1 + calc(2 * 2));
+}
+```
+
+## Usage
+
+Add [PostCSS Nested Calc] to your project:
+
+```bash
+npm install postcss @csstools/postcss-nested-calc --save-dev
+```
+
+Use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssNestedCalc = require('@csstools/postcss-nested-calc');
+
+postcss([
+	postcssNestedCalc(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS Nested Calc] runs in all Node environments, with special
+instructions for:
+
+- [Node](INSTALL.md#node)
+- [PostCSS CLI](INSTALL.md#postcss-cli)
+- [PostCSS Load Config](INSTALL.md#postcss-load-config)
+- [Webpack](INSTALL.md#webpack)
+- [Next.js](INSTALL.md#nextjs)
+- [Gulp](INSTALL.md#gulp)
+- [Grunt](INSTALL.md#grunt)
+
+## Options
+
+### preserve
+
+The `preserve` option determines whether the original notation
+is preserved. By default the original values are preserved.
+
+```js
+postcssNestedCalc({ preserve: false })
+```
+
+```pcss
+.example {
+	order: calc(1 + calc(2 * 2));
+}
+
+/* becomes */
+
+.example {
+	order: calc(1 + (2 * 2));
+}
+```
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[css-url]: https://cssdb.org/#nested-calc
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/@csstools/postcss-nested-calc
+
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Nested Calc]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-nested-calc
+[CSS Values and Units 4 specification]: https://www.w3.org/TR/css-values/#calc-func