user/test/com/google/gwt/resources/converter/undefined-constants.css

.foo {
  display: NONE;
  color: JFK_MY_STUFF;
  background-color: JFK_123_ASD;
}

.cellTableHeader {
  padding: HEADER_VERTICAL_PADDING HEADER_HORIZONTAL_PADDING;
}

@def TOP top;

.foo {
  /* PD94 should not be converted to lower case) */
  background-image: url("data:image/svg+xml;base64,PD94basdfasdfasdf");
  background: -webkit-gradient(LINEAR, LEFT TOP, RIGHT TOP,from(rgba(255,255,255,0)),to(#fff));
}