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-# PostCSS image-set() Function [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][postcss]
-
-[![NPM Version][npm-img]][npm-url]
-[![Build Status][cli-img]][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/image-set-function.svg" height="20">][css-url]
-[![CSS Standard Status][css-img]][css-url]
-
-[PostCSS image-set() Function] lets you display resolution-dependent images
-using the `image-set()` function in CSS, following the [CSS Images]
-specification.
-
-[!['Can I use' table](https://caniuse.bitsofco.de/image/css-image-set.png)](https://caniuse.com/#feat=css-image-set)
-
-```pcss
-.example {
- background-image: image-set(
- url(img.png) 1x,
- url(img@2x.png) 2x,
- url(img@print.png) 600dpi
- );
-}
-
-/* becomes */
-
-.example {
- background-image: url(img.png);
-}
-
-@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
- .example {
- background-image: url(img@2x.png);
- }
-}
-
-
-@media (-webkit-min-device-pixel-ratio: 6.25), (min-resolution: 600dpi) {
- .example {
- background-image: url(my@print.png);
- }
-}
-
-.example {
- background-image: image-set(
- url(img.png) 1x,
- url(img@2x.png) 2x,
- url(img@print.png) 600dpi
- );
-}
-```
-
-## Usage
-
-Add [PostCSS image-set() Function] to your project:
-
-```bash
-npm install postcss-image-set-function --save-dev
-```
-
-Use [PostCSS image-set() Function] as a [PostCSS] plugin:
-
-```js
-const postcss = require('postcss');
-const postcssImageSetFunction = require('postcss-image-set-function');
-
-postcss([
- postcssImageSetFunction(/* pluginOptions */)
-]).process(YOUR_CSS /*, processOptions */);
-```
-
-[PostCSS image-set() Function] runs in all Node environments, with special
-instructions for:
-
-| [Node](INSTALL.md#node) | [PostCSS CLI](INSTALL.md#postcss-cli) | [Webpack](INSTALL.md#webpack) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) |
-| --- | --- | --- | --- | --- |
-
-## Options
-
-### preserve
-
-The `preserve` option determines whether the original declaration using
-`image-set()` is preserved. By default, it is preserved.
-
-```js
-postcssImageSetFunction({ preserve: false })
-```
-
-```pcss
-.example {
- background-image: image-set(
- url(img.png) 1x,
- url(img@2x.png) 2x,
- url(img@print.png) 600dpi
- );
-}
-
-/* becomes */
-
-@media (-webkit-min-device-pixel-ratio: 1), (min-resolution: 96dpi) {
- .example {
- background-image: url(img.png);
- }
-}
-
-@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
- .example {
- background-image: url(img@2x.png);
- }
-}
-
-
-@media (-webkit-min-device-pixel-ratio: 6.25), (min-resolution: 600dpi) {
- .example {
- background-image: url(my@print.png);
- }
-}
-```
-
-### onInvalid
-
-The `onInvalid` option determines how invalid usage of `image-set()` should be
-handled. By default, invalid usages of `image-set()` are ignored.
-They can be configured to emit a warning with `warn` or throw an exception with `throw`.
-
-```js
-postcssImageSetFunction({ onInvalid: 'warn' }) // warn on invalid usages
-```
-
-```js
-postcssImageSetFunction({ onInvalid: 'throw' }) // throw on invalid usages
-```
-
-## Image Resolution
-
-The `image-set()` function allows an author to provide multiple resolutions of
-an image and let the browser decide which is most appropriate in a given
-situation. The `image-set()` also never fails to choose an image; the
-`<resolution>` just helps determine which of the images is chosen.
-
-Since this plugin is not a browser, the image options are sorted by device
-pixel ratio and the lowest ratio is used as the default, while the remaining
-images are pushed behind media queries.
-
-Therefore, this plugin can only approximate native browser behavior. While
-images should typically match the resolution as the device they’re being viewed
-in, other factors can affect the chosen image. For example, if the user is on a
-slow mobile connection, the browser may prefer to select a lower-res image
-rather than wait for a larger, resolution-matching image to load.
-
-[cli-img]: https://github.com/csstools/postcss-plugins/workflows/test/badge.svg
-[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
-[css-img]: https://cssdb.org/images/badges/image-set-function.svg
-[css-url]: https://cssdb.org/#image-set-function
-[discord]: https://discord.gg/bUadyRwkJS
-[npm-img]: https://img.shields.io/npm/v/postcss-image-set-function.svg
-[npm-url]: https://www.npmjs.com/package/postcss-image-set-function
-
-[CSS Images]: https://drafts.csswg.org/css-images-4/#image-set-notation
-[Gulp PostCSS]: https://github.com/postcss/gulp-postcss
-[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss
-[PostCSS]: https://github.com/postcss/postcss
-[PostCSS Loader]: https://github.com/postcss/postcss-loader
-[PostCSS image-set() Function]: https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-image-set-function