<tt xmlns:ttm="http://www.w3.org/2006/10/ttaf1#metadata"
  xmlns:ttp="http://www.w3.org/2006/10/ttaf1#parameter"
  xmlns:tts="http://www.w3.org/2006/10/ttaf1#style"
  xmlns="http://www.w3.org/ns/ttml"
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  <body>
    <div>
      <p begin="10s" end="18s">Text with <span tts:textCombine="all">combined</span> section.</p>
    </div>
    <div>
      <p begin="20s" end="28s">Text with <span tts:textCombine="none">un-combined</span> section.</p>
    </div>
    <div>
      <p begin="30s" end="38s">"No textCombine"</p>
    </div>
  </body>
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