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chromium/third_party/blink/web_tests/paint/invalidation/scroll/overflow-hidden-yet-scrolled-with-custom-scrollbar.html 

<!doctype html>
<script src="../resources/text-based-repaint.js"></script>
<style>
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
    background: green;
}
</style>
<!-- Checks that paint invalidation for the custom scrollbar of 'target' is computed correctly after scroll of 'scroller'.
The invalidation rects should be correct, and the horizontal & vertical scrollbars should appear in green. -->
<div id="scroller" style="overflow: hidden; width: 300px; height: 300px; backface-visibility: hidden; border: 1px solid black">
  <div style="width: 300px; height: 600px"></div>
  <div id=target style="width: 100px; height: 100px; background: lightgray; overflow: scroll">
  </div>
</div>
<script>
onload = runRepaintTest;

function repaintTest() {
    scroller.scrollTop = 400;
}
</script>