| <!DOCTYPE html> | 
 | <title>Parsing and serialization of doctype internal subset</title> | 
 | <script src="/resources/testharness.js"></script> | 
 | <script src="/resources/testharnessreport.js"></script> | 
 | <script> | 
 | test(function () { | 
 |  // https://www.w3.org/TR/xml11/#sec-prolog-dtd has intSubset as part of the | 
 |  // syntax, which is not represented in the DocumentType interface. Check that | 
 |  // publicId and systemId are not affected. | 
 |  var doc = new DOMParser().parseFromString('<!DOCTYPE foo [ <!ENTITY x "y"> ]><foo>&x;</foo>', 'text/xml'); | 
 |  var doctype = doc.doctype; | 
 |  assert_equals(doctype.name, 'foo', 'doctype name'); | 
 |  assert_equals(doctype.publicId, '', 'doctype publicId'); | 
 |  assert_equals(doctype.systemId, '', 'doctype systemId'); | 
 |  // Check that document itself was parsed correctly. | 
 |  var documentElementString = new XMLSerializer().serializeToString(doc.documentElement); | 
 |  assert_equals(documentElementString, '<foo>y</foo>', 'serialized document element'); | 
 |  // https://w3c.github.io/DOM-Parsing/#xml-serializing-a-documenttype-node also | 
 |  // does not have any notion of the internal subset, so also check that it | 
 |  // isn't serialized by XMLSerializer. | 
 |  var doctypeString = new XMLSerializer().serializeToString(doctype); | 
 |  assert_equals(doctypeString, '<!DOCTYPE foo>', 'serialized doctype'); | 
 | }); | 
 | </script> |