/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
h2 {background: url(../images/h2.gif?test);}
body {background: url(body.gif);}
a {background: url(data:image/png;)}
li {background: url("https://example.com/absolute.gif");}
ol.favicon {background: url(Magento_Theme::favicon.ico)} /* base file */