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('>')
      HtmlTag:b
        XmlToken:XML_START_TAG_START('<')
        XmlToken:XML_NAME('b')
        XmlToken:XML_TAG_END('>')
        XmlText
          XmlToken:XML_DATA_CHARACTERS('<')
          PsiWhiteSpace(' ')
        HtmlTag:c
          XmlToken:XML_START_TAG_START('<')
          XmlToken:XML_NAME('c')
          XmlToken:XML_EMPTY_ELEMENT_END('/>')
        PsiErrorElement:Element b is not closed
          <empty list>
      XmlToken:XML_END_TAG_START('</')
      XmlToken:XML_NAME('a')
      XmlToken:XML_TAG_END('>')