palemoon-dev/platform/layout/reftests/css-ui-invalid/input/style.css

/* Override default style */
input:-moz-ui-invalid {
  box-shadow: none;
}

input.notinvalid {
  background-color: green;
}
input.notinvalid:-moz-ui-invalid {
  background-color: red;
}

input.invalid {
  background-color: red;
}
input.invalid:-moz-ui-invalid {
  background-color: green;
}

input[type=checkbox],
input[type=radio] {
  display: none;
}