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postcss-custom-media
Advanced tools
Readme
PostCSS Custom Media lets you define @custom-media
in CSS following the Custom Media Specification.
@custom-media --small-viewport (max-width: 30em);
@media (--small-viewport) {
/* styles for small viewport */
}
/* becomes */
@media (max-width: 30em) {
/* styles for small viewport */
}
true
and false
With @custom-media
you can use the constants true
and false
.
These are especially handy when debugging.
If you are unsure how your page is affected when a certain media query matches or not you can use these, to quickly toggle the results. This plugin downgrades these queries to something that works in all browsers.
Quickly check the result as if the query matches:
@custom-media --small-viewport true;
@media (--small-viewport) {
/* styles for small viewport */
}
/* becomes */
@media (max-color:2147477350) {
/* styles for small viewport */
}
Quickly check the result as if the query does not match:
@custom-media --small-viewport false;
@media (--small-viewport) {
/* styles for small viewport */
}
/* becomes */
@media (color:2147477350) {
/* styles for small viewport */
}
It is impossible to accurately and correctly resolve complex @custom-media
queries
as these depend on the browser the queries will eventually run in.
Some of these queries will have only one possible outcome but we have to account for all possible queries in this plugin.
⚠️ When handling complex media queries you will see that your CSS is doubled for each level of complexity.
GZIP works great to de-dupe this but having a lot of complex media queries will have a performance impact.
An example of a very complex (and artificial) use-case :
@custom-media --a-complex-query tty and (min-width: 300px);
@media not screen and ((not (--a-complex-query)) or (color)) {
/* Your CSS */
}
/* becomes */
@media tty and (min-width: 300px) {
@media not screen and ((not (max-color:2147477350)) or (color)) {
/* Your CSS */
}
}
@media not tty and (min-width: 300px) {
@media not screen and ((not (color:2147477350)) or (color)) {
/* Your CSS */
}
}
Add PostCSS Custom Media to your project:
npm install postcss postcss-custom-media --save-dev
Use it as a PostCSS plugin:
const postcss = require('postcss');
const postcssCustomMedia = require('postcss-custom-media');
postcss([
postcssCustomMedia(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);
PostCSS Custom Media runs in all Node environments, with special instructions for:
The preserve
option determines whether the original notation
is preserved. By default, it is not preserved.
postcssCustomMedia({ preserve: true })
@custom-media --small-viewport (max-width: 30em);
@media (--small-viewport) {
/* styles for small viewport */
}
/* becomes */
@custom-media --small-viewport (max-width: 30em);
@media (max-width: 30em) {
/* styles for small viewport */
}
@media (--small-viewport) {
/* styles for small viewport */
}
FAQs
Use Custom Media Queries in CSS
The npm package postcss-custom-media receives a total of 4,703,782 weekly downloads. As such, postcss-custom-media popularity was classified as popular.
We found that postcss-custom-media demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 5 open source maintainers collaborating on the project.
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