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chromium/third_party/blink/web_tests/external/wpt/css/css-scrollbars/scrollbar-color-dynamic-2.html 

<!doctype html>
<html class="reftest-wait">
<title>Dynamically set scrollbar-color and ensure overflow scroll scrollbars update</title>
<link rel="author" title="Luke Warlow" href="mailto:[email protected]" />
<link rel="help" href="https://drafts.csswg.org/css-scrollbars/#valdef-scrollbar-color-auto" />
<link rel="match" href="scrollbar-color-dynamic-2-ref.html" />
<link rel="mismatch" href="scrollbar-color-dynamic-2-mis-ref.html" />
<script src="/common/reftest-wait.js"></script>
<style>
  :root {
    scrollbar-color: red yellow;
  }
  body {
    display: flex;
    flex-wrap: wrap;
    overflow: scroll;
  }
  .container {
    scrollbar-gutter: stable;
    overflow: scroll;
    flex: 0 0;
    height: 200px;
    min-width: 200px;
    margin: 1px;
    padding: 0px;
    border: none;
    background: deepskyblue;
  }
</style>
<div class="container"></div>
<script>
  requestAnimationFrame(() => requestAnimationFrame(() => {
    document.documentElement.style.scrollbarColor = 'blue green';

   takeScreenshot();
  }));
</script>