.a {
	background: url();
	background: url("");
	background: url("foo.svg");
	background: url("foo.png");
	background: url("/foo.svg");
	background: url("/foo.png");
	background: url("/path/foo.png");
	background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='90' height='45'%3E%3Cpath d='M10 10h60' stroke='%2300F' stroke-width='5'/%3E%3Cpath d='M10 20h60' stroke='%230F0' stroke-width='5'/%3E%3Cpath d='M10 30h60' stroke='red' stroke-width='5'/%3E%3C/svg%3E");

	filter: url("./foo.svg#b");
	filter: url("./../foo.svg#b");

	mask-image: url("foo.svg#a");
	mask-image: url("foo.svg#foo");
	mask-image: url("http://foo-cdn.com/assets/foo.svg#bar");

	offset-path: url();
	offset-path: url(#b);
	offset-path: url("#a");
	offset-path: url('#a');
	offset-path: url( "#a" );
	offset-path: url( '#a' );
}