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chromium/third_party/blink/web_tests/virtual/fluent-overlay-scrollbar/visual/scrollbar-show-tickmarks.html 

<!doctype html>
<!-- Tests that tickmarks get painted and scrollbar transitions to full mode.
     -->
<meta charset="utf-8">
<meta name="fuzzy" content="0-10;0-10">
<script src="../../../resources/gesture-util.js"></script>
<script src="../../../resources/testharness.js"></script>
<style>
  body,
  html {
    background-color: green;
    height: 2000px;
    margin: 0;
    width: 2000px;
  }
</style>
<span id="select-target">&nbsp;</span>
<script>
  window.onload = async () => {
    if (!internals) return;

    testRunner.waitUntilDone();

    let range = document.createRange();
    let elt = document.getElementById('select-target');
    range.selectNodeContents(elt);
    internals.addTextMatchMarker(range, 'kActive');

    await waitForCompositorCommit();
    testRunner.notifyDone();
  };
</script>