  x Document
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   : ^^^^^^^^^^^^^^^
   `----
  x DocumentType
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   : ^^^^^^^^^^^^^^^
   `----
  x Child
  x Element
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   :                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Element
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   :                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   :                      ^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Element
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   :                      ^^^^^^^^^^^^^^^^^^^^^^^^
   `----
  x Attribute
   ,-[$DIR/tests/html5lib-tests-fixture/tests19_dat.0.html:1:1]
 1 | <!doctype html><math><mn DefinitionUrl="foo">
   :                          ^^^^^^^^^^^^^^^^^^^
   `----
