115 lines
3.0 KiB
Markdown
115 lines
3.0 KiB
Markdown
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# PostCSS Browser Comments [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS" width="90" height="90" align="right">][postcss]
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[![NPM Version][npm-img]][npm-url]
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[![Build Status][cli-img]][cli-url]
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[![Support Chat][git-img]][git-url]
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[PostCSS Browser Comments] lets you keep only the CSS you need based on
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comments and your [browserslist].
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```css
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/**
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* Prevent adjustments of font size after orientation changes in IE and iOS.
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*/
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html {
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-ms-text-size-adjust: 100%;
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-webkit-text-size-adjust: 100%;
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}
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```
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The comment and rule above would be removed with the following browserslist:
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```yml
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last 2 chrome versions
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```
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The rule below would be more carefully altered:
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```css
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/**
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* 1. Add the correct box sizing in Firefox.
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* 2. Show the overflow in Edge and IE.
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*/
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hr {
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box-sizing: content-box; /* 1 */
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height: 0; /* 1 */
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overflow: visible; /* 2 */
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}
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/* with a `last 2 firefox versions` browserslist becomes */
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/**
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* 1. Add the correct box sizing in Firefox.
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* 2. Show the overflow in Edge and IE.
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*/
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hr {
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box-sizing: content-box; /* 1 */
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height: 0; /* 1 */
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}
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```
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---
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[PostCSS Browser Comments] can remove rules based upon the comment above them,
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or it can remove declarations using numbered comments that reference the rule
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above them. In the later case, when all of the numbered comments are removed,
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then the entire rule and comment are also removed.
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## Usage
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Add [PostCSS Browser Comments] to your project:
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```bash
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npm install postcss-browser-comments --save-dev
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```
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Use [PostCSS Browser Comments] to process your CSS:
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```js
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const postcssBrowserComments = require('postcss-browser-comments');
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postcssBrowserComments.process(YOUR_CSS /*, processOptions, pluginOptions */);
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```
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Or use it as a [PostCSS] plugin:
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```js
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const postcss = require('postcss');
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const postcssBrowserComments = require('postcss-browser-comments');
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postcss([
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postcssBrowserComments(/* pluginOptions */)
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]).process(YOUR_CSS /*, processOptions */);
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```
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[PostCSS Browser Comments] runs in all Node environments, with special instructions for:
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| [Node](INSTALL.md#node) | [PostCSS CLI](INSTALL.md#postcss-cli) | [Webpack](INSTALL.md#webpack) | [Create React App](INSTALL.md#create-react-app) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) |
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| --- | --- | --- | --- | --- | --- |
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## Options
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### browsers
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The `browsers` option overrides of the project’s browserslist.
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```js
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postcssBrowserComments({
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browsers: 'last 2 versions'
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});
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```
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[cli-img]: https://img.shields.io/travis/csstools/postcss-browser-comments.svg
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[cli-url]: https://travis-ci.org/csstools/postcss-browser-comments
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[git-img]: https://img.shields.io/badge/support-chat-blue.svg
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[git-url]: https://gitter.im/postcss/postcss
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[npm-img]: https://img.shields.io/npm/v/postcss-browser-comments.svg
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[npm-url]: https://www.npmjs.com/package/postcss-browser-comments
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[browserslist]: https://github.com/browserslist/browserslist
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[PostCSS]: https://github.com/postcss/postcss
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[PostCSS Browser Comments]: https://github.com/csstools/postcss-browser-comments
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