  x Document
   ,-[$DIR/tests/html5lib-tests-fixture/tests1_dat.40.html:1:1]
 1 | <?#
   : ^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests1_dat.40.html:1:1]
 1 | <?#
   : ^^^
   `----
  x Comment
   ,-[$DIR/tests/html5lib-tests-fixture/tests1_dat.40.html:1:1]
 1 | <?#
   : ^^^
   `----
  x Child
  x Element
