HtmlFile:test.html
  PsiElement(HTML_DOCUMENT)
    PsiElement(XML_PROLOG)
      <empty list>
    HtmlTag:a
      XmlToken:XML_START_TAG_START('<')
      XmlToken:XML_NAME('a')
      XmlToken:XML_TAG_END('>')
      XmlText
        PsiElement(XML_COMMENT)
          XmlToken:XML_COMMENT_START('<!--')
          XmlToken:XML_COMMENT_CHARACTERS('<b>')
          XmlToken:XML_COMMENT_END('-->')
      XmlToken:XML_END_TAG_START('</')
      XmlToken:XML_NAME('a')
      XmlToken:XML_TAG_END('>')