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-# PostCSS Trigonometric 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-trigonometric-functions.svg" height="20">][npm-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]<br><br>[<img alt="Baseline Status" src="https://cssdb.org/images/badges-baseline/trigonometric-functions.svg" height="20">][css-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/trigonometric-functions.svg" height="20">][css-url]
-
-```bash
-npm install @csstools/postcss-trigonometric-functions --save-dev
-```
-
-[PostCSS Trigonometric Functions] lets you use `sin`, `cos`, `tan`, `asin`, `acos`, `atan` and `atan2` to be able to compute trigonometric relationships following the [CSS Values 4] specification.
-
-```pcss
-.trigonometry {
- line-height: sin(pi / 4);
- line-height: cos(.125turn);
- line-height: tan(50grad);
- transform: rotate(asin(-1));
- transform: rotate(asin(sin(30deg + 1.0471967rad)));
- transform: rotate(acos(-1));
- transform: rotate(acos(cos(0 / 2 + 1 - 1)));
- transform: rotate(atan(infinity));
- transform: rotate(atan(e - 2.7182818284590452354));
- transform: rotate(atan2(-infinity,-infinity));
- transform: rotate(atan2(-infinity,infinity));
- transform: rotate(atan2(-infinity,infinity));
- transform: rotate(atan2(90, 15));
-}
-
-/* becomes */
-
-.trigonometry {
- line-height: 0.70711;
- line-height: 0.70711;
- line-height: 1;
- transform: rotate(-90deg);
- transform: rotate(89.99995deg);
- transform: rotate(180deg);
- transform: rotate(0deg);
- transform: rotate(90deg);
- transform: rotate(0deg);
- transform: rotate(-135deg);
- transform: rotate(-45deg);
- transform: rotate(-45deg);
- transform: rotate(80.53768deg);
-}
-```
-
-## Usage
-
-Add [PostCSS Trigonometric Functions] to your project:
-
-```bash
-npm install postcss @csstools/postcss-trigonometric-functions --save-dev
-```
-
-Use it as a [PostCSS] plugin:
-
-```js
-const postcss = require('postcss');
-const postcssTrigonometricFunctions = require('@csstools/postcss-trigonometric-functions');
-
-postcss([
- postcssTrigonometricFunctions(/* pluginOptions */)
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-[PostCSS Trigonometric 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)
-
-## ⚠️ About custom properties
-
-Given the dynamic nature of custom properties it's impossible to know what the variable value is, which means the plugin can't compute a final value for the stylesheet.
-
-Because of that, any usage that contains a `var` is skipped.
-
-## Units
-
-[PostCSS Trigonometric Functions] lets you use different special units that are within the spec and computed at run time to be able to calculate the result of the trigonometric function.
-
-The following units are supported:
-
-* `pi`: Computes to `Math.PI` which is `3.141592653589793`
-* `e`: Computes to `Math.E` which is `2.718281828459045`
-* `infinity`, `-infinity`: Compute to `Infinity` and `-Infinity` respectively. Note that the usage is case insensitive so `InFiNiTy` is a valid value.
-
-Some calculations (such as `sin(-infinity)`) might return `NaN` as per the spec. Given that `NaN` can't be replaced with a value that's useful to CSS it is left as is, as the result will be effectively ignored by the browser.
-
-## Options
-
-### preserve
-
-The `preserve` option determines whether the original notation
-is preserved. By default, it is not preserved.
-
-```js
-postcssTrigonometricFunctions({ preserve: true })
-```
-
-```pcss
-.trigonometry {
- line-height: sin(pi / 4);
- line-height: cos(.125turn);
- line-height: tan(50grad);
- transform: rotate(asin(-1));
- transform: rotate(asin(sin(30deg + 1.0471967rad)));
- transform: rotate(acos(-1));
- transform: rotate(acos(cos(0 / 2 + 1 - 1)));
- transform: rotate(atan(infinity));
- transform: rotate(atan(e - 2.7182818284590452354));
- transform: rotate(atan2(-infinity,-infinity));
- transform: rotate(atan2(-infinity,infinity));
- transform: rotate(atan2(-infinity,infinity));
- transform: rotate(atan2(90, 15));
-}
-
-/* becomes */
-
-.trigonometry {
- line-height: 0.70711;
- line-height: sin(pi / 4);
- line-height: 0.70711;
- line-height: cos(.125turn);
- line-height: 1;
- line-height: tan(50grad);
- transform: rotate(-90deg);
- transform: rotate(asin(-1));
- transform: rotate(89.99995deg);
- transform: rotate(asin(sin(30deg + 1.0471967rad)));
- transform: rotate(180deg);
- transform: rotate(acos(-1));
- transform: rotate(0deg);
- transform: rotate(acos(cos(0 / 2 + 1 - 1)));
- transform: rotate(90deg);
- transform: rotate(atan(infinity));
- transform: rotate(0deg);
- transform: rotate(atan(e - 2.7182818284590452354));
- transform: rotate(-135deg);
- transform: rotate(atan2(-infinity,-infinity));
- transform: rotate(-45deg);
- transform: rotate(atan2(-infinity,infinity));
- transform: rotate(-45deg);
- transform: rotate(atan2(-infinity,infinity));
- transform: rotate(80.53768deg);
- transform: rotate(atan2(90, 15));
-}
-```
-
-[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
-[css-url]: https://cssdb.org/#trigonometric-functions
-[discord]: https://discord.gg/bUadyRwkJS
-[npm-url]: https://www.npmjs.com/package/@csstools/postcss-trigonometric-functions
-
-[PostCSS]: https://github.com/postcss/postcss
-[PostCSS Trigonometric Functions]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-trigonometric-functions
-[CSS Values 4]: https://www.w3.org/TR/css-values-4/#trig-funcs