  x Document
   ,-[$DIR/tests/html5lib-tests-fixture/tests6_dat.4.html:1:1]
 1 | <!doctype>
   : ^^^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests6_dat.4.html:1:1]
 1 | <!doctype>
   : ^^^^^^^^^^
   `----
  x DocumentType
   ,-[$DIR/tests/html5lib-tests-fixture/tests6_dat.4.html:1:1]
 1 | <!doctype>
   : ^^^^^^^^^^
   `----
  x Child
  x Element
