  x Document
   ,-[$DIR/tests/recovery/document_type/unknown/input.html:1:1]
 1 | <!DOCTYPE >Hello
   : ^^^^^^^^^^^^^^^^
   `----
  x Child
   ,-[$DIR/tests/recovery/document_type/unknown/input.html:1:1]
 1 | <!DOCTYPE >Hello
   : ^^^^^^^^^^^
   `----
  x DocumentType
   ,-[$DIR/tests/recovery/document_type/unknown/input.html:1:1]
 1 | <!DOCTYPE >Hello
   : ^^^^^^^^^^^
   `----
  x Child
  x Element
  x Child
   ,-[$DIR/tests/recovery/document_type/unknown/input.html:1:1]
 1 | <!DOCTYPE >Hello
   :            ^^^^^
   `----
  x Text
   ,-[$DIR/tests/recovery/document_type/unknown/input.html:1:1]
 1 | <!DOCTYPE >Hello
   :            ^^^^^
   `----
