background: red;
  color: red;
  display: table-cell; /* Make a BFC */
}
div > div {
  width: 0;
  height: 0;
  margin: 50px;
  color: green;
  outline: solid currentcolor 50px;
}
</style>

  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
  <div><div></div></div>

