  x Document
   ,-[$DIR/tests/html5lib-tests-fixture/doctype01_dat.9.html:1:1]
 1 | <!DOCTYPE potato sYstEM>Hello
   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/doctype01_dat.9.html:1:1]
 1 | <!DOCTYPE potato sYstEM>Hello
   : ^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x DocumentType
   ,-[$DIR/tests/html5lib-tests-fixture/doctype01_dat.9.html:1:1]
 1 | <!DOCTYPE potato sYstEM>Hello
   : ^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Child
  x Element
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/doctype01_dat.9.html:1:1]
 1 | <!DOCTYPE potato sYstEM>Hello
   :                         ^^^^^
   `----
  x Text
   ,-[$DIR/tests/html5lib-tests-fixture/doctype01_dat.9.html:1:1]
 1 | <!DOCTYPE potato sYstEM>Hello
   :                         ^^^^^
   `----
