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chromium/third_party/blink/web_tests/external/wpt/css/cssom-view/getClientRects-br-vrl-ltr.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="[email protected]">
<link rel="help" href="https://drafts.csswg.org/cssom-view-1/#dom-element-getclientrects">
<div style="position:absolute; top:0; left:0; width:200px; height:100px; writing-mode:vertical-rl; direction:ltr;">
  <br id="child">
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=>{
      let r = document.getElementById("child").getClientRects()[0];
      assert_greater_than(r.left, 150);
      assert_less_than(r.left, 200);
      assert_equals(r.top, 0);
  }, "Position of the BR element");
</script>