2nd arg of document.createElement should be an object

third_party/WebKit/Source/core/dom/ElementCreationOptions.idl

Index: third_party/WebKit/Source/core/dom/ElementCreationOptions.idl
diff --git a/services/shell/background/tests/test.mojom b/third_party/WebKit/Source/core/dom/ElementCreationOptions.idl
similarity index 59%
copy from services/shell/background/tests/test.mojom
copy to third_party/WebKit/Source/core/dom/ElementCreationOptions.idl
index 18a92ec2634bed55b4048f5ece0e83b36f0c7b8f..feae6b56f2781b3baf3bfc6ed0619b4d7afbbf0f 100644
--- a/services/shell/background/tests/test.mojom
+++ b/third_party/WebKit/Source/core/dom/ElementCreationOptions.idl
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module shell.mojom;
+// https://dom.spec.whatwg.org/#dictdef-elementcreationoptions
 
-interface TestService {
-  Test() => ();
+dictionary ElementCreationOptions {
+  DOMString is;
 };