<svg xmlns="http://www.w3.org/2000/svg">
  <g>
    <defs>
      <font>
        <font-face font-family="HappySad">
        </font-face>
      </font>
    </defs>
    <g font-family="HappySad" style="-webkit-writing-mode: vertical-rl; ">
      <text>
        <altGlyph>A</altGlyph>
        A: This test passes if you see two As at the start of this message.
      </text>
    </g>
  </g>
  <script>
    if (window.testRunner)
      testRunner.dumpAsText();

    var docElement = document.body ? document.body : document.documentElement;
    if (docElement) docElement.offsetTop;
  </script>
</svg>