chromium/third_party/blink/web_tests/paint/lists/invalidate-list-marker-color.html

<!doctype HTML>
<style>
ul {
    color: white;
    background:gray;
}
</style>
The test succeeds if the bullet is black.
<ul id='target'>
    <li>Test</li>
</ul>
<script>
if (window.testRunner)
  testRunner.waitUntilDone();

onload = function() {
  requestAnimationFrame(function() {
    target.style.color = 'black';
    if (window.testRunner)
      testRunner.notifyDone();
  });
};
</script>