gecko-dev/layout/reftests/stylesheet-cloning/ref-common.css

body {
  /* to match ua.css, see bug 1020143 */
  font-variant-numeric: tabular-nums;
}
div, p {
  padding: 0; margin: 0;
  line-height: 150%;
  float: left;
}
p {
  padding-right: .5em;
}