HtmlFile:test.html
  PsiElement(HTML_DOCUMENT)
    PsiElement(XML_PROLOG)
      <empty list>
    HtmlTag:a
      XmlToken:XML_START_TAG_START('<')
      XmlToken:XML_NAME('a')
      PsiErrorElement:Tag start is not closed
        <empty list>
    PsiWhiteSpace('   ')
    PsiErrorElement:Closing tag matches nothing
      XmlToken:XML_END_TAG_START('</')
      XmlToken:XML_NAME('a')
      XmlToken:XML_TAG_END('>')