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+# PostCSS Exponential Functions [<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-exponential-functions.svg" height="20">][npm-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/exponential-functions.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]
+
+```bash
+npm install @csstools/postcss-exponential-functions --save-dev
+```
+
+[PostCSS Exponential Functions] lets you use the `pow()`, `sqrt()`, `hypot()`, `log()`, `exp()` functions following the [CSS Values 4 Specification].
+
+```pcss
+.foo {
+	top: calc(1px * pow(2, 3));
+	line-height: sqrt(1.2);
+	padding: hypot(3px, 4px);
+	order: log(10, 10);
+	min-height: calc(e - exp(1));
+}
+
+/* becomes */
+
+.foo {
+	top: 8px;
+	line-height: 1.0954451150103;
+	padding: 5px;
+	order: 1;
+	min-height: 0;
+}
+```
+
+## Usage
+
+Add [PostCSS Exponential Functions] to your project:
+
+```bash
+npm install postcss @csstools/postcss-exponential-functions --save-dev
+```
+
+Use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssExponentialFunctions = require('@csstools/postcss-exponential-functions');
+
+postcss([
+	postcssExponentialFunctions(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS Exponential Functions] 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, it is not preserved.
+
+```js
+postcssExponentialFunctions({ preserve: true })
+```
+
+```pcss
+.foo {
+	top: calc(1px * pow(2, 3));
+	line-height: sqrt(1.2);
+	padding: hypot(3px, 4px);
+	order: log(10, 10);
+	min-height: calc(e - exp(1));
+}
+
+/* becomes */
+
+.foo {
+	top: 8px;
+	top: calc(1px * pow(2, 3));
+	line-height: 1.0954451150103;
+	line-height: sqrt(1.2);
+	padding: 5px;
+	padding: hypot(3px, 4px);
+	order: 1;
+	order: log(10, 10);
+	min-height: 0;
+	min-height: calc(e - exp(1));
+}
+```
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[css-url]: https://cssdb.org/#exponential-functions
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/@csstools/postcss-exponential-functions
+
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Exponential Functions]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-exponential-functions
+[CSS Values 4 Specification]: https://www.w3.org/TR/css-values-4/#exponent-funcs