diff --git a/src/components/script/dom/webidls/TestBinding.webidl b/src/components/script/dom/webidls/TestBinding.webidl
index 4cc2fac87f9..23504dd2c44 100644
--- a/src/components/script/dom/webidls/TestBinding.webidl
+++ b/src/components/script/dom/webidls/TestBinding.webidl
@@ -4,6 +4,40 @@
 
 enum TestEnum { "", "foo", "bar" };
 
+/* dictionary TestDictionary {
+  // boolean booleanValue;
+  // byte byteValue;
+  // octet octetValue;
+  // short shortValue;
+  // unsigned short unsignedShortValue;
+  // long longValue;
+  // unsigned long unsignedLongValue;
+  // long long longLongValue;
+  // unsigned long long unsignedLongLongValue;
+  // float floatValue;
+  // double doubleValue;
+  // DOMString stringValue;
+  // TestEnum enumValue;
+  // Blob interfaceValue;
+  // any anyValue;
+}; */
+
+dictionary TestDictionaryDefaults {
+  // boolean booleanValue = false;
+  // byte byteValue = 7;
+  // octet octetValue = 7;
+  short shortValue = 7;
+  unsigned short unsignedShortValue = 7;
+  long longValue = 7;
+  unsigned long unsignedLongValue = 7;
+  // long long longLongValue = 7;
+  // unsigned long long unsignedLongLongValue = 7;
+  // float floatValue = 7.0;
+  // double doubleValue = 7.0;
+  DOMString stringValue = "";
+  // TestEnum enumValue = "bar";
+};
+
 interface TestBinding {
            attribute boolean booleanAttribute;
            attribute byte byteAttribute;