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chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-anchoring/text-anchor-in-vertical-rl.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/">

<p>There should be no red below.</p>
<div id="container" style="writing-mode:vertical-rl; overflow:auto; width:300px; height:300px;">
  <div style="width:300px; background:red;"></div>
  <div style="width:400px; font-size:16px; line-height:25px;">
    <span id="displayMe" style="color:red; display:none;">
      FAIL<br>FAIL<br>FAIL<br>FAIL<br>
    </span>
    line<br>
  </div>
  <div id="displayMeToo" style="display:none; width:300px; background:red;"></div>
</div>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=> {
      var container = document.getElementById("container");
      var displayMe = document.getElementById("displayMe");
      var displayMeToo = document.getElementById("displayMeToo");
      // Scroll the text container into view.
      container.scrollLeft = -300;
      displayMe.style.display = "inline";
      displayMeToo.style.display = "block";
      assert_equals(container.scrollLeft, -400);
  }, "Line at edge of scrollport shouldn't jump visually when content is inserted before");
</script>