6 background: url
(wiki.png);
10 background: url
(unknown.png);
14 background: url
(https://example
.org
/foo
.png
);
15 background: url
('https://example.org/foo.png');
16 background: url
("https://example.org/foo.png");
21 background: url
(wiki.png);
26 background: url
(circle.svg);
31 background: url
(wiki.png), url
(wiki.png);