postcss-critical-split/testsuite/markers-custom-block-tag/input.css

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

body {
	background-color: black;
}

p {
	color: red;
}

a {
 	/* this-is-critical */
 	text-decoration: none;
}

ul {
	padding: 0;
}