chromium/third_party/blink/web_tests/svg/text/vertical-surrogate-pairs.html

<!DOCTYPE html>
<svg xmlns="http://www.w3.org/2000/svg" width="800" height="100">
  <desc>Test if auto glyph orientation in vertical flow works for surrogate pairs.</desc>
  <style>
  @font-face {
    font-family:cssot;
    src:url(../../third_party/adobe-fonts/CSSFWOrientationTest.otf);
  }
  text.test {
    font-family:cssot;
    font-size:50px;
  }
  </style>
  <text y="20">Test pass if the triangle points to the right.</text>
  <text class="test" writing-mode="tb" x="90" y="30">&#x1100F;</text>
  <script>
    document.body.offsetLeft; // Kick off loading @font-face
    if (window.testRunner) {
      testRunner.waitUntilDone();
      document.body.onload = function () { testRunner.notifyDone(); };
    }
  </script>
</svg>