background: green; }
		}

		.test2 { background: green; }
		@supports (content: attr(y|href)) {
			.test2 { background: red; }
		}

		.test3 { background: red; }
		@supports not (content: attr(y|href)) {
			.test3 { background: green; }
		}

		.test4 { background: red; }
		.test5 { background: green; }
		@supports (background: red) {
			x|y, .test4 { background: green; }
			y|x, .test5 { background: red; }
		}
	</style>
</head>
<body>
	<p>Test passes if there is a <strong>filled green square</strong> and <s