user/test/com/google/gwt/resources/converter/multiple_declarations.css

pre {
 white-space: pre-wrap;
 white-space: -moz-pre-wrap;
 white-space: -pre-wrap;
 white-space: -o-pre-wrap;
 word-wrap: break-word;
}

@sprite .foo {
  gwt-image: 'bar';
  height: 10px;
  height: 20px;
}