scrollbar-color-scheme-dynamic-3.html

<!doctype html>
<html class="reftest-wait">
<title>Dynamically set color-scheme and ensure 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-scheme-dynamic-3-ref.html" />
<script src="/common/reftest-wait.js"></script>
<style>
  :root {
    color-scheme: light;
  }
  body {
    display: flex;
    flex-wrap: wrap;
    width: 200vw;
    height: 200vh;
  }

  .container {
    scrollbar-gutter: stable;
    overflow: auto;
    flex: 0 0;
    height: 200px;
    min-width: 200px;
    margin: 1px;
    padding: 0px;
    border: none;
    background: deepskyblue;
  }

  .content {
    height: 300px;
    width: 300px;
    background: red;
  }
</style>
<div class="container">
  <div class="content"></div>
</div>
<script>
  requestAnimationFrame(() => requestAnimationFrame(() => {
    document.querySelector(".container").style.colorScheme = 'dark';

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

chromium/third_party/blink/web_tests/external/wpt/css/css-scrollbars/scrollbar-color-scheme-dynamic-3.html