@font-face {
  font-family: 'coool';
  font-style: normal;
  font-weight: 400;
  src: url(fonts/coool.woff) format('woff');
  src:url("fonts/coool.eot?#iefix") format("embedded-opentype"),url("fonts/coool.woff") format("woff"),url("fonts/coool.ttf") format("truetype"),url("fonts/coool.svg#coool") format("svg")
}

.something {
  /* filter src should NOT be converted, as it's supposed to be relative to the document already */
  filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(
    src='images/test.jpg',
    sizingMethod='scale'
  );

  background-image: url('../images/foo.png');
  background-image: url('../images/bar.png?12345');
  background-image: url(../images/foo.png);
  background-image: url( ../images/bar.png  );
  background-image: url(  
    ../images/bar.png
       )
}

.another-thing {
  background-image: url(more-images/bar.jpg?12345);
  background-image: url( more-images/bar.jpg?12345 );
  background-image: url( 'more-images/bar.jpg' );
  background-image: url(
    more-images/bar.jpg   
  );
  background-image  : url(images/thing.jpg);
}

.other-things {
  background-image: url(data:image/gif;base64,R0lGODlhAQABAPAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==);
  background-image: url( data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw== );
}

.moar-things {
  background-image: url(/styles/more-images/thing.jpg);
  background-image: url(http://i.imgur.com/C5XQm.gif);
  filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(
    src='http://example.com/images/test.jpg',
    sizingMethod='scale'
  );
}

*, *:before, *:after {
  box-sizing: border-box;
  /* urls in IE's 'behavior' property should NOT be converted as it's already relative to the document... */
  
  /* without hack */
  behavior: url(scripts/boxsizing.htc);
  behavior  : url(  scripts/boxsizing.htc  );
  
  /* with IE<8 hack */
  *behavior: url(scripts/boxsizing.htc);
}
