css/css-conditional/at-supports-content-001.html

<!doctype html>
<head>
	<title>CSS Test (Conditional Rules): Invalid rules inside @supports</title>
	<!-- This test is paired with at-media-content-001.html ; please keep them in sync -->
	<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
	<link rel="help" href="https://www.w3.org/TR/css-conditional-3/#contents-of">
	<link rel="help" href="https://www.w3.org/TR/css-conditional-3/#at-media">
	<link rel="match" href="at-supports-001-ref.html">
	<meta name="assert"
	      content="Test passes if invalid rules within @media do not invalidate the @media rule.">
	<style>
		div {
			background: red;
			height: 20px;
			width: 100px;
		}

		@supports (background: blue) {
			@import "support/fail.css";
			.test1 { background: green; }
		}
		@supports (background: blue) {
			@namespace foo "http://www.w3.org/";
			.test2 { background: green; }
			.test2:not(foo|div) { background: red; }
		}
		@supports (background: blue) {
			@charset "utf-8";
			.test3 { background: green; }
		}
		@supports (background: blue) {
			@unknown;
			.test4 { background: green; }
		}
		@supports (background: blue) {
			.test5 { background: green; }
			@unknown {
				.test5 { background: red; }
			}
		}
	</style>
</head>
<body>
	<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
	<div class="test1"></div>
	<div class="test2"></div>
	<div class="test3"></div>
	<div class="test4"></div>
	<div class="test5"></div>
</body>
</html>