DOCTYPE: html
  html lang="en"
    head
    #text: ⏎␣␣
      title
      #text: Sample page
      #text: ⏎␣
    #text: ⏎␣
    body
    #text: ⏎␣␣
      h1
      #text: Sample page
      #text: ⏎␣␣
      p
        #text: This is a
        a href="demo.html"
      	 #text: simple
      #text: sample.
      #text: ⏎␣␣
      #comment: this is a comment
     #text: ⏎␣⏎