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

<!doctype html>
<head>
	<title>CSS Test (Conditional Rules): Support for simple passing conditions in @supports</title>
	<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
	<link rel="author" href="http://opera.com" title="Opera Software ASA">
	<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
	<link rel="match" href="at-supports-001-ref.html">
	<style>
		div {
			background-color:red;
			height:50px;
			width:100px;
		}
		@supports (margin: 0) {
			.test1 { background:green; }
			.test2 { background: red; }
		}
		.test2 { background: green; }
	</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>
</body>
</html>