testsuite/css/parser/resource-url.ref.css - external/github.com/GNOME/gtk - Git at Google

 window {
   background-image: none /* invalid image */;
 }

 button {
   background-image: none /* invalid image */;
 }
	window {
	background-image: none /* invalid image */;
	}

	button {
	background-image: none /* invalid image */;
	}