.CLASS-1 { 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#ID-1"); filter: url("./../foo.svg#ID-1"); mask-image: url("foo.svg#ID-2"); mask-image: url("foo.svg#__ignore--foo"); mask-image: url("http://foo-cdn.com/assets/foo.svg#bar"); offset-path: url(); offset-path: url(#ID-1); offset-path: url("#ID-2"); offset-path: url('#ID-2'); offset-path: url( "#ID-2" ); offset-path: url( '#ID-2' ); }