Package Exports

postcss-focus-within
postcss-focus-within/dist/index.cjs
postcss-focus-within/dist/index.mjs

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (postcss-focus-within) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

PostCSS Focus Within

PostCSS Focus Within lets you use the :focus-within pseudo-class in CSS, following the Selectors Level 4 specification.

It is the companion to the focus-within polyfill.

.my-form-field:focus-within label {
  background-color: yellow;
}

/* becomes */

.my-form-field[focus-within] label {
  background-color: yellow;
}

.my-form-field:focus-within label {
  background-color: yellow;
}

PostCSS Focus Within duplicates rules using the :focus-within pseudo-class with a [focus-within] attribute selector, the same selector used by the focus-within polyfill. This replacement selector can be changed using the replaceWith option. Also, the preservation of the original :focus-within rule can be disabled using the preserve option.

Usage

Add PostCSS Focus Within to your project:

npm install postcss postcss-focus-within --save-dev

Use PostCSS Focus Within to process your CSS:

const postcssFocusWithin = require('postcss-focus-within');

postcssFocusWithin.process(YOUR_CSS /*, processOptions, pluginOptions */);

Or use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssFocusWithin = require('postcss-focus-within');

postcss([
  postcssFocusWithin(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);

PostCSS Focus Within runs in all Node environments, with special instructions for:

Node	PostCSS CLI	Webpack	Create React App	Gulp	Grunt

Options

preserve

The preserve option defines whether the original selector should remain. By default, the original selector is preserved.

focusWithin({ preserve: false });

.my-form-field:focus-within label {
  background-color: yellow;
}

/* becomes */

.my-form-field[focus-within] label {
  background-color: yellow;
}

replaceWith

The replaceWith option defines the selector to replace :focus-within. By default, the replacement selector is [focus-within].

focusWithin({ replaceWith: '.focus-within' });

.my-form-field:focus-within label {
  background-color: yellow;
}

/* becomes */

.my-form-field.focus-within label {
  background-color: yellow;
}

.my-form-field:focus-within label {
  background-color: yellow;
}