third_party/blink/web_tests/content_extraction/vertical-writing-mode.html

<!DOCTYPE html>
<html>
<head>
<link href="./resources/consistent-rendering.css" rel="stylesheet" />
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="./resources/content-extraction-test-helpers.js"></script>
<script src="../resources/ahem.js"></script>

<script>
function runTest() {
  finishTest(dumpContentNodeTree(document));
}
</script>
</head>

<body onload="runTest()">
  <!--
  Expected: Vertical text fragmented between characters (no spaces) with horizontal inline element.
  Challenge: Mixed writing directions with character-level fragmentation in content extraction.
  -->
  <div style="writing-mode: vertical-rl; width: 100px; height: 60px;">
    ABCDEFGHIJKL<span style="writing-mode: horizontal-tb;">horizontal</span>MNOPQRSTU
  </div>
</body>
</html>