diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index fd247c45b0..0d21541a4d 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -1070,14 +1070,28 @@ JS::Value Document::run_javascript(StringView source, StringView filename)
 }
 
 // https://dom.spec.whatwg.org/#dom-document-createelement
-// FIXME: This only implements step 6 of the algorithm and does not take in options.
-DOM::ExceptionOr<JS::NonnullGCPtr<Element>> Document::create_element(String const& tag_name)
+DOM::ExceptionOr<JS::NonnullGCPtr<Element>> Document::create_element(FlyString const& a_local_name)
 {
-    if (!is_valid_name(tag_name))
+    auto local_name = a_local_name;
+
+    // 1. If localName does not match the Name production, then throw an "InvalidCharacterError" DOMException.
+    if (!is_valid_name(local_name))
         return DOM::InvalidCharacterError::create(global_object(), "Invalid character in tag name.");
 
-    // FIXME: Let namespace be the HTML namespace, if this is an HTML document or this’s content type is "application/xhtml+xml", and null otherwise.
-    return DOM::create_element(*this, tag_name, Namespace::HTML);
+    // 2. If this is an HTML document, then set localName to localName in ASCII lowercase.
+    if (document_type() == Type::HTML)
+        local_name = local_name.to_lowercase();
+
+    // FIXME: 3. Let is be null.
+    // FIXME: 4. If options is a dictionary and options["is"] exists, then set is to it.
+
+    // 5. Let namespace be the HTML namespace, if this is an HTML document or this’s content type is "application/xhtml+xml"; otherwise null.
+    FlyString namespace_;
+    if (document_type() == Type::HTML || content_type() == "application/xhtml+xml"sv)
+        namespace_ = Namespace::HTML;
+
+    // 6. Return the result of creating an element given this, localName, namespace, null, is, and with the synchronous custom elements flag set.
+    return DOM::create_element(*this, local_name, namespace_);
 }
 
 // https://dom.spec.whatwg.org/#dom-document-createelementns
diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index cd1b0bf666..eefdf3f281 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -191,7 +191,7 @@ public:
 
     JS::Value run_javascript(StringView source, StringView filename = "(unknown)"sv);
 
-    ExceptionOr<JS::NonnullGCPtr<Element>> create_element(String const& tag_name);
+    ExceptionOr<JS::NonnullGCPtr<Element>> create_element(FlyString const& local_name);
     ExceptionOr<JS::NonnullGCPtr<Element>> create_element_ns(String const& namespace_, String const& qualified_name);
     JS::NonnullGCPtr<DocumentFragment> create_document_fragment();
     JS::NonnullGCPtr<Text> create_text_node(String const& data);