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+# PostCSS Blank Pseudo [<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/css-blank-pseudo.svg" height="20">][npm-url] [<img alt="CSS Standard Status" src="https://cssdb.org/images/badges/blank-pseudo-class.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 Blank Pseudo] lets you style form elements when they are empty, following 
+the [Selectors Level 4] specification.
+
+To use this feature you need to do two things :
+- add the [PostCSS plugin](#usage) that transforms the selector into a class or attribute
+- add the [browser polyfill](#browser) that sets the attribute or class on elements in a browser
+
+```pcss
+input:blank {
+	background-color: yellow;
+}
+
+/* becomes */
+
+input[blank].js-blank-pseudo, .js-blank-pseudo input[blank] {
+	background-color: yellow;
+}
+input:blank {
+	background-color: yellow;
+}
+```
+
+## Usage
+
+Add [PostCSS Blank Pseudo] to your project:
+
+```bash
+npm install postcss css-blank-pseudo --save-dev
+```
+
+Use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssBlankPseudo = require('css-blank-pseudo');
+
+postcss([
+	postcssBlankPseudo(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS Blank Pseudo] 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 preserved.
+
+```js
+postcssBlankPseudo({ preserve: false })
+```
+
+```pcss
+input:blank {
+	background-color: yellow;
+}
+
+/* becomes */
+
+input[blank].js-blank-pseudo, .js-blank-pseudo input[blank] {
+	background-color: yellow;
+}
+```
+
+### replaceWith
+
+The `replaceWith` option determines the selector to use when replacing
+the `:blank` pseudo. By default is `[blank]`
+
+```js
+postcssBlankPseudo({ replaceWith: '.css-blank' })
+```
+
+```pcss
+input:blank {
+	background-color: yellow;
+}
+
+/* becomes */
+
+.foo {
+	color: blue;
+	color: red;
+}
+
+.baz {
+	color: green;
+}
+```
+
+Note that changing this option implies that it needs to be passed to the
+browser polyfill as well.
+
+### disablePolyfillReadyClass
+
+The `disablePolyfillReadyClass` option determines if selectors are prefixed with an indicator class.
+This class is only set on your document if the polyfill loads and is needed.
+
+By default this option is `false`.
+Set this to `true` to prevent the class from being added.
+
+```js
+postcssBlankPseudo({ disablePolyfillReadyClass: true })
+```
+
+```pcss
+input:blank {
+	background-color: yellow;
+}
+
+/* becomes */
+
+input[blank] {
+	background-color: yellow;
+}
+input:blank {
+	background-color: yellow;
+}
+```
+
+## Browser
+
+```js
+import cssBlankPseudoInit from 'css-blank-pseudo/browser';
+
+cssBlankPseudoInit();
+```
+
+or
+
+```html
+<!-- When using a CDN url you will have to manually update the version number -->
+<script src="https://unpkg.com/css-blank-pseudo@6.0.0/dist/browser-global.js"></script>
+<script>cssBlankPseudoInit()</script>
+```
+
+[PostCSS Blank Pseudo] works in all major browsers, including Safari 6+ and
+Internet Explorer 9+ without any additional polyfills.
+
+This plugin conditionally uses `MutationObserver` to ensure recently inserted 
+inputs get correct styling upon insertion. If you intend to rely on that 
+behaviour for browsers that do not support `MutationObserver`, you have two
+options:
+
+1. Polyfill `MutationObserver`. As long as it runs before `cssBlankPseudoInit`,
+the polyfill will work.
+2. If you don't want to polyfill `MutationObserver` you can also manually fire
+a `change` event upon insertion so they're automatically inspected by the
+polyfill.
+
+### Browser Usage
+
+#### force
+
+The `force` option determines whether the library runs even if the browser 
+supports the selector or not. By default, it won't run if the browser does
+support the selector.
+
+```js
+cssBlankPseudoInit({ force: true });
+```
+
+#### replaceWith
+
+Similar to the option for the PostCSS Plugin, `replaceWith` determines the
+attribute or class to apply to an element when it's considered to be `:blank`.
+
+```js
+cssBlankPseudoInit({ replaceWith: '.css-blank' });
+```
+
+This option should be used if it was changed at PostCSS configuration level.
+Please note that using a class, leverages `classList` under the hood which 
+might  not be supported on some old browsers such as IE9, so you may need 
+to polyfill `classList` in those cases.
+
+### Using with Next.js
+
+Given that Next.js imports packages both on the browser and on the server, you need to make sure that the package is only imported on the browser.
+
+As outlined in the [Next.js documentation](https://nextjs.org/docs/advanced-features/dynamic-import#with-external-libraries), you need to load the package with a dynamic import:
+
+```jsx
+useEffect(async () => {
+	const cssBlankPseudoInit = (await import('css-blank-pseudo/browser')).default;
+	cssBlankPseudoInit();
+}, []);
+```
+
+We recommend you load the polyfill as high up on your Next application as possible, such as your `pages/_app.ts` file.
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[css-url]: https://cssdb.org/#blank-pseudo-class
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/css-blank-pseudo
+
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Blank Pseudo]: https://github.com/csstools/postcss-plugins/tree/main/plugins/css-blank-pseudo
+[Selectors Level 4]: https://www.w3.org/TR/selectors-4/#blank