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chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-anchoring/support/flexbox-scrolling-vertical-rl.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  html {
      writing-mode: vertical-rl;
      overflow: hidden;
      background: red;
  }
  body {
      margin: 0;
  }
</style>
<div style="display:flex; flex-direction:column-reverse;">
  <div style="block-size:1000px;"></div>
  <div style="block-size:100px; background:green;"></div>
  <div style="block-size:100px;"></div>
</div>
<script>
  window.scrollTo(-100, 0);
</script>