postcss-critical-split/testsuite/modules-media-queries/input.css

A PostCSS plugin that takes existing CSS files and splits out the annotated critical styles into a seperate file.

/* critical:start:header */
body {
	background-color: black;
}

p {
	color: red;
}

@media screen and (min-width: 400px) {
	p {
		display: inline-block;
		border: red thin solid;
	}

	div {
		float: left;
	}

	div::before {
		display: table;
	}
}
/* critical:end */

a {
 	text-decoration: none;
}

table {
	width: 100%;
	height: 200%;
}

* {
	font-family: Arial, "Arial Black", sans-serif;
}

@media screen and (min-width: 500px) {
	p {
		display: inline-block;
		border: red thin solid;
	}

	div {
		/* critical:nav */
		float: left;
	}

	div::before {
		display: table;
	}
}

span {
	/* critical:header */
	display: inline-block;
	color: #333;
}