foo
foo
foo
foo
foo

.foo {
  background-image: url('foo');
}
.whatever {
  background-image: url("foo");
}
.bar {
  background-image: 'oh noes';
}
.bing {
  background-image: url(foo);
}

/*
.bing {
  background-image: url(../photoB.png);
}
*/

/**
 *  .bing {
 *    background-image: url(../photoB.png);
 *  }
 */

@font-face {
  font-family: 'Glyphicons Halflings';

  src: url('foo');
  src: url('foo') format('embedded-opentype'), url("foo") format('woff'), url('foo') format('truetype'), url('foo') format('svg');
}