gecko/testing/mochitest/tests/SimpleTest/test.css

.test_ok {
  color: #0d0;
  display: none;
}

.test_not_ok {
  color: red;
  display: block;
}

.test_todo {
  /* color: orange; */
  display: block;
}

.test_ok, .test_not_ok, .test_todo {
  border-bottom-width: 2px;
  border-bottom-style: solid;
  border-bottom-color: black;
}

.all_pass {
  background-color: #0d0;
}

.some_fail {
  background-color: red;
}

.todo_only {
  background-color: orange;
}

.tests_report {
  border-width: 2px;
  border-style: solid;
  width: 20em;
  display: table;
}