textdecorationcolor-currentcolor) {
  text-decoration-line: underline;
  text-decoration-color: currentcolor;
}
::highlight(color-currentcolor-backgroundcolor-currentcolor) {
  color: currentcolor;
  background-color: currentcolor;
}
::highlight(color-currentcolor-backgroundcolor-blue) {
  color: currentcolor;
  background-color: blue;
}
::highlight(color-blue-backgroundcolor-currentcolor) {
  color: blue;
  background-color: currentcolor;
}
</style>

<div id="empty" class="highlight_reftest">example - empt