body {
    background  :  url  (  basic  )  ;
    background  :  url  (  with space  )  ;

    background  :  url  (  '  single  '  )  ;
    background  :  url  (  "  double  "  )  ;

    background  :  url  (  '  nested  "  double  "  single  '  )  ;
    background  :  url  (  "  nested  '  single  '  double  "  )  ;

    background  :  url  (  '  escaped  \'  single  \'  single  '  )  ;
    background  :  url  (  "  escaped  \"  double  \"  double  "  )  ;

    background  :  url  (  '  escaped  \\\'  single  \\\'  single  '  )  ;
    background  :  url  (  "  escaped  \\\"  double  \\\"  double  "  )  ;

    background  :  url  (  '  nested  /*  comment  */  single  '  )  ;
    background  :  url  (  "  nested  /*  comment  */  dobule  "  )  ;

    background  :  url  (  /*  before  */  '  single  '  /*  after  */  )  ;
    background  :  url  (  /*  before  */  "  double  "  /*  after  */  )  ;
}

body{background-size:cover;background-repeat:no-repeat;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg clip-rule='evenodd' fill-rule='evenodd' stroke-linejoin='round' stroke-miterlimit='1.5' viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'%3E%3CclipPath id='a'%3E%3Cpath d='M0 0h200v200H0z'/%3E%3C/clipPath%3E%3Cg clip-path='url(%23a)' transform='scale(0.5)'%3E%3Cimage height='200' transform='scale(2 2)' width='200' xlink:href='data:image/jpeg;base64,abcdef'/%3E%3C/g%3E%3C/svg%3E")}body{background-image:linear-gradient(180deg,white,rgba(0,0,0,0) 200px);min-height:200px}