  x Document
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   : ^^^^^^^^^^^^^^^
   `----
  x DocumentType
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   : ^^^^^^^^^^^^^^^
   `----
  x Child
  x Element
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   :                ^^^^^^^^^^^^^^^^^^^
   `----
  x Element
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   :                ^^^^^^^^^^^^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   :                   ^^^^^^^^
   `----
  x Element
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   :                   ^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   :                           ^^^^^^^^
   `----
  x Element
   ,-[$DIR/tests/html5lib-tests-fixture/tests20_dat.0.html:1:1]
 1 | <!doctype html><p><button><button>
   :                           ^^^^^^^^
   `----
