diff --git a/Libraries/LibWeb/DOM/DOMImplementation.cpp b/Libraries/LibWeb/DOM/DOMImplementation.cpp
index dc31d69e713..dd22a104473 100644
--- a/Libraries/LibWeb/DOM/DOMImplementation.cpp
+++ b/Libraries/LibWeb/DOM/DOMImplementation.cpp
@@ -137,14 +137,16 @@ GC::Ref<Document> DOMImplementation::create_html_document(Optional<String> const
 }
 
 // https://dom.spec.whatwg.org/#dom-domimplementation-createdocumenttype
-WebIDL::ExceptionOr<GC::Ref<DocumentType>> DOMImplementation::create_document_type(String const& qualified_name, String const& public_id, String const& system_id)
+WebIDL::ExceptionOr<GC::Ref<DocumentType>> DOMImplementation::create_document_type(String const& name, String const& public_id, String const& system_id)
 {
-    // 1. Validate qualifiedName.
-    TRY(Document::validate_qualified_name(realm(), qualified_name));
 
-    // 2. Return a new doctype, with qualifiedName as its name, publicId as its public ID, and systemId as its system ID, and with its node document set to the associated document of this.
+    // 1. If name is not a valid doctype name, then throw an "InvalidCharacterError" DOMException.
+    if (!is_valid_doctype_name(name))
+        return WebIDL::InvalidCharacterError::create(realm(), "Invalid doctype name"_string);
+
+    // 2. Return a new doctype, with name as its name, publicId as its public ID, and systemId as its system ID, and with its node document set to the associated document of this.
     auto document_type = DocumentType::create(document());
-    document_type->set_name(qualified_name);
+    document_type->set_name(name);
     document_type->set_public_id(public_id);
     document_type->set_system_id(system_id);
     return document_type;
diff --git a/Libraries/LibWeb/DOM/DOMImplementation.h b/Libraries/LibWeb/DOM/DOMImplementation.h
index d131ef2f798..85d8fbac08c 100644
--- a/Libraries/LibWeb/DOM/DOMImplementation.h
+++ b/Libraries/LibWeb/DOM/DOMImplementation.h
@@ -23,7 +23,7 @@ public:
 
     WebIDL::ExceptionOr<GC::Ref<XMLDocument>> create_document(Optional<FlyString> const&, String const&, GC::Ptr<DocumentType>) const;
     GC::Ref<Document> create_html_document(Optional<String> const& title) const;
-    WebIDL::ExceptionOr<GC::Ref<DocumentType>> create_document_type(String const& qualified_name, String const& public_id, String const& system_id);
+    WebIDL::ExceptionOr<GC::Ref<DocumentType>> create_document_type(String const& name, String const& public_id, String const& system_id);
 
     // https://dom.spec.whatwg.org/#dom-domimplementation-hasfeature
     bool has_feature() const
diff --git a/Libraries/LibWeb/DOM/DocumentType.cpp b/Libraries/LibWeb/DOM/DocumentType.cpp
index 8ae25b002ce..988ef89f414 100644
--- a/Libraries/LibWeb/DOM/DocumentType.cpp
+++ b/Libraries/LibWeb/DOM/DocumentType.cpp
@@ -28,4 +28,12 @@ void DocumentType::initialize(JS::Realm& realm)
     Base::initialize(realm);
 }
 
+// https://dom.spec.whatwg.org/#valid-doctype-name
+bool is_valid_doctype_name(String const& name)
+{
+    // A string is a valid doctype name if it does not contain ASCII whitespace, U+0000 NULL, or U+003E (>).
+    constexpr Array<u32, 7> INVALID_DOCTYPE_CHARACTERS { '\t', '\n', '\f', '\r', ' ', '\0', '>' };
+    return !name.code_points().contains_any_of(INVALID_DOCTYPE_CHARACTERS);
+}
+
 }
diff --git a/Libraries/LibWeb/DOM/DocumentType.h b/Libraries/LibWeb/DOM/DocumentType.h
index 08067ce72b2..52f7197c7f4 100644
--- a/Libraries/LibWeb/DOM/DocumentType.h
+++ b/Libraries/LibWeb/DOM/DocumentType.h
@@ -44,6 +44,8 @@ private:
     String m_system_id;
 };
 
+bool is_valid_doctype_name(String const&);
+
 template<>
 inline bool Node::fast_is<DocumentType>() const { return is_document_type(); }
 
diff --git a/Tests/LibWeb/Text/expected/wpt-import/dom/nodes/DOMImplementation-createDocumentType.txt b/Tests/LibWeb/Text/expected/wpt-import/dom/nodes/DOMImplementation-createDocumentType.txt
new file mode 100644
index 00000000000..ae216d1c34b
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/dom/nodes/DOMImplementation-createDocumentType.txt
@@ -0,0 +1,87 @@
+Harness status: OK
+
+Found 82 tests
+
+82 Pass
+Pass	DOMImplementation.createDocumentType(qualifiedName, publicId, systemId)
+Pass	createDocumentType("", "", "") should work
+Pass	createDocumentType("test:root", "1234", "") should work
+Pass	createDocumentType("test:root", "1234", "test") should work
+Pass	createDocumentType("test:root", "test", "") should work
+Pass	createDocumentType("test:root", "test", "test") should work
+Pass	createDocumentType("_:_", "", "") should work
+Pass	createDocumentType("_:h0", "", "") should work
+Pass	createDocumentType("_:test", "", "") should work
+Pass	createDocumentType("_:_.", "", "") should work
+Pass	createDocumentType("_:a-", "", "") should work
+Pass	createDocumentType("l_:_", "", "") should work
+Pass	createDocumentType("ns:_0", "", "") should work
+Pass	createDocumentType("ns:a0", "", "") should work
+Pass	createDocumentType("ns0:test", "", "") should work
+Pass	createDocumentType("ns:EEE.", "", "") should work
+Pass	createDocumentType("ns:_-", "", "") should work
+Pass	createDocumentType("a.b:c", "", "") should work
+Pass	createDocumentType("a-b:c.j", "", "") should work
+Pass	createDocumentType("a-b:c", "", "") should work
+Pass	createDocumentType("foo", "", "") should work
+Pass	createDocumentType("1foo", "", "") should work
+Pass	createDocumentType("foo1", "", "") should work
+Pass	createDocumentType("f1oo", "", "") should work
+Pass	createDocumentType("@foo", "", "") should work
+Pass	createDocumentType("foo@", "", "") should work
+Pass	createDocumentType("f@oo", "", "") should work
+Pass	createDocumentType("edi:{", "", "") should work
+Pass	createDocumentType("edi:}", "", "") should work
+Pass	createDocumentType("edi:~", "", "") should work
+Pass	createDocumentType("edi:'", "", "") should work
+Pass	createDocumentType("edi:!", "", "") should work
+Pass	createDocumentType("edi:@", "", "") should work
+Pass	createDocumentType("edi:#", "", "") should work
+Pass	createDocumentType("edi:$", "", "") should work
+Pass	createDocumentType("edi:%", "", "") should work
+Pass	createDocumentType("edi:^", "", "") should work
+Pass	createDocumentType("edi:&", "", "") should work
+Pass	createDocumentType("edi:*", "", "") should work
+Pass	createDocumentType("edi:(", "", "") should work
+Pass	createDocumentType("edi:)", "", "") should work
+Pass	createDocumentType("edi:+", "", "") should work
+Pass	createDocumentType("edi:=", "", "") should work
+Pass	createDocumentType("edi:[", "", "") should work
+Pass	createDocumentType("edi:]", "", "") should work
+Pass	createDocumentType("edi:\\", "", "") should work
+Pass	createDocumentType("edi:/", "", "") should work
+Pass	createDocumentType("edi:;", "", "") should work
+Pass	createDocumentType("edi:`", "", "") should work
+Pass	createDocumentType("edi:<", "", "") should work
+Pass	createDocumentType("edi:>", "", "") should throw INVALID_CHARACTER_ERR
+Pass	createDocumentType("edi:,", "", "") should work
+Pass	createDocumentType("edi:a ", "", "") should throw INVALID_CHARACTER_ERR
+Pass	createDocumentType("edi:\"", "", "") should work
+Pass	createDocumentType("{", "", "") should work
+Pass	createDocumentType("}", "", "") should work
+Pass	createDocumentType("'", "", "") should work
+Pass	createDocumentType("~", "", "") should work
+Pass	createDocumentType("`", "", "") should work
+Pass	createDocumentType("@", "", "") should work
+Pass	createDocumentType("#", "", "") should work
+Pass	createDocumentType("$", "", "") should work
+Pass	createDocumentType("%", "", "") should work
+Pass	createDocumentType("^", "", "") should work
+Pass	createDocumentType("&", "", "") should work
+Pass	createDocumentType("*", "", "") should work
+Pass	createDocumentType("(", "", "") should work
+Pass	createDocumentType(")", "", "") should work
+Pass	createDocumentType("f:oo", "", "") should work
+Pass	createDocumentType(":foo", "", "") should work
+Pass	createDocumentType("foo:", "", "") should work
+Pass	createDocumentType("prefix::local", "", "") should work
+Pass	createDocumentType("foo", "foo", "") should work
+Pass	createDocumentType("foo", "", "foo") should work
+Pass	createDocumentType("foo", "f'oo", "") should work
+Pass	createDocumentType("foo", "", "f'oo") should work
+Pass	createDocumentType("foo", "f\"oo", "") should work
+Pass	createDocumentType("foo", "", "f\"oo") should work
+Pass	createDocumentType("foo", "f'o\"o", "") should work
+Pass	createDocumentType("foo", "", "f'o\"o") should work
+Pass	createDocumentType("foo", "foo>", "") should work
+Pass	createDocumentType("foo", "", "foo>") should work
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/input/wpt-import/dom/nodes/DOMImplementation-createDocumentType.html b/Tests/LibWeb/Text/input/wpt-import/dom/nodes/DOMImplementation-createDocumentType.html
new file mode 100644
index 00000000000..505ec5dc0fc
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/dom/nodes/DOMImplementation-createDocumentType.html
@@ -0,0 +1,123 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>DOMImplementation.createDocumentType(qualifiedName, publicId, systemId)</title>
+<link rel=help href="https://dom.spec.whatwg.org/#dom-domimplementation-createdocumenttype">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-documenttype-name">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-documenttype-publicid">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-documenttype-systemid">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-node-ownerdocument">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+  var tests = [
+    ["", "", "", null],
+    ["test:root", "1234", "", null],
+    ["test:root", "1234", "test", null],
+    ["test:root", "test", "", null],
+    ["test:root", "test", "test", null],
+    ["_:_", "", "", null],
+    ["_:h0", "", "", null],
+    ["_:test", "", "", null],
+    ["_:_.", "", "", null],
+    ["_:a-", "", "", null],
+    ["l_:_", "", "", null],
+    ["ns:_0", "", "", null],
+    ["ns:a0", "", "", null],
+    ["ns0:test", "", "", null],
+    ["ns:EEE.", "", "", null],
+    ["ns:_-", "", "", null],
+    ["a.b:c", "", "", null],
+    ["a-b:c.j", "", "", null],
+    ["a-b:c", "", "", null],
+    ["foo", "", "", null],
+    ["1foo", "", "", null],
+    ["foo1", "", "", null],
+    ["f1oo", "", "", null],
+    ["@foo", "", "", null],
+    ["foo@", "", "", null],
+    ["f@oo", "", "", null],
+    ["edi:{", "", "", null],
+    ["edi:}", "", "", null],
+    ["edi:~", "", "", null],
+    ["edi:'", "", "", null],
+    ["edi:!", "", "", null],
+    ["edi:@", "", "", null],
+    ["edi:#", "", "", null],
+    ["edi:$", "", "", null],
+    ["edi:%", "", "", null],
+    ["edi:^", "", "", null],
+    ["edi:&", "", "", null],
+    ["edi:*", "", "", null],
+    ["edi:(", "", "", null],
+    ["edi:)", "", "", null],
+    ["edi:+", "", "", null],
+    ["edi:=", "", "", null],
+    ["edi:[", "", "", null],
+    ["edi:]", "", "", null],
+    ["edi:\\", "", "", null],
+    ["edi:/", "", "", null],
+    ["edi:;", "", "", null],
+    ["edi:`", "", "", null],
+    ["edi:<", "", "", null],
+    ["edi:>", "", "", "INVALID_CHARACTER_ERR"],
+    ["edi:,", "", "", null],
+    ["edi:a ", "", "", "INVALID_CHARACTER_ERR"],
+    ["edi:\"", "", "", null],
+    ["{", "", "", null],
+    ["}", "", "", null],
+    ["'", "", "", null],
+    ["~", "", "", null],
+    ["`", "", "", null],
+    ["@", "", "", null],
+    ["#", "", "", null],
+    ["$", "", "", null],
+    ["%", "", "", null],
+    ["^", "", "", null],
+    ["&", "", "", null],
+    ["*", "", "", null],
+    ["(", "", "", null],
+    [")", "", "", null],
+    ["f:oo", "", "", null],
+    [":foo", "", "", null],
+    ["foo:", "", "", null],
+    ["prefix::local", "", "", null],
+    ["foo", "foo", "", null],
+    ["foo", "", "foo", null],
+    ["foo", "f'oo", "", null],
+    ["foo", "", "f'oo", null],
+    ["foo", 'f"oo', "", null],
+    ["foo", "", 'f"oo', null],
+    ["foo", "f'o\"o", "", null],
+    ["foo", "", "f'o\"o", null],
+    ["foo", "foo>", "", null],
+    ["foo", "", "foo>", null]
+  ]
+
+  var doc = document.implementation.createHTMLDocument("title");
+  var doTest = function(aDocument, aQualifiedName, aPublicId, aSystemId) {
+    var doctype = aDocument.implementation.createDocumentType(aQualifiedName, aPublicId, aSystemId);
+    assert_equals(doctype.name, aQualifiedName, "name")
+    assert_equals(doctype.nodeName, aQualifiedName, "nodeName")
+    assert_equals(doctype.publicId, aPublicId, "publicId")
+    assert_equals(doctype.systemId, aSystemId, "systemId")
+    assert_equals(doctype.ownerDocument, aDocument, "ownerDocument")
+    assert_equals(doctype.nodeValue, null, "nodeValue")
+  }
+  tests.forEach(function(t) {
+    var qualifiedName = t[0], publicId = t[1], systemId = t[2], expected = t[3]
+    test(function() {
+      if (expected) {
+        assert_throws_dom(expected, function() {
+          document.implementation.createDocumentType(qualifiedName, publicId, systemId)
+        })
+      } else {
+        doTest(document, qualifiedName, publicId, systemId);
+        doTest(doc, qualifiedName, publicId, systemId);
+      }
+    }, "createDocumentType(" + format_value(qualifiedName) + ", " + format_value(publicId) + ", " + format_value(systemId) + ") should " +
+       (expected ? "throw " + expected : "work"));
+  });
+})
+</script>