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

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

strong {
	font-weight: bold;
}

@media screen and (min-width: 300px) {
	strong {
		color: #f00;
	}

	p {
		/* critical */
		float: left;
		text-decoration: underline;
	}
}