css/css-conditional/at-supports-content-003.html

<!doctype html>
<head>
	<title>CSS Test (Conditional Rules): @keyframes rules inside @supports</title>
	<!-- This test is paired with at-media-content-003.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-supports">
	<link rel="help" href="https://www.w3.org/TR/css-animations-1/">
	<link rel="match" href="at-supports-001-ref.html">
	<meta name="assert"
	      content="Test passes if @keyframes rules within @supports are supported.">
	<style>
		div {
			background: red;
			width: 100px;
			height: 100px;
			animation: green 4s both;
		}

		@supports (color: blue) {
			@keyframes green {
				from {
					background: green;
				}
				to {
					background: green;
				}
			}
		}
		@supports not (color: blue) {
			@keyframes green {
				from {
					background: red;
				}
				to {
					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>
</body>
</html>