HtmlFile:test.html
  PsiElement(HTML_DOCUMENT)
    PsiElement(XML_PROLOG)
      PsiElement(XML_PROCESSING_INSTRUCTION)
        XmlToken:XML_PI_START('<?')
        XmlToken:XML_PI_TARGET('xml version="1.0" encoding='cp1251' ')
        XmlToken:XML_PI_END('>')
      PsiWhiteSpace(' ')
    HtmlTag:foo
      XmlToken:XML_START_TAG_START('<')
      XmlToken:XML_NAME('foo')
      XmlToken:XML_TAG_END('>')
      XmlToken:XML_END_TAG_START('</')
      XmlToken:XML_NAME('foo')
      XmlToken:XML_TAG_END('>')