src/third_party/web_platform_tests/resources/webidl2/test/syntax/idl/serializer.widl

interface Transaction {
  readonly attribute Account from;
  readonly attribute Account to;
  readonly attribute float amount;
  readonly attribute DOMString description;
  readonly attribute unsigned long number;

  serializer;
};

interface Account {
  attribute DOMString name;
  attribute unsigned long number;
  serializer DOMString serialize();
};

interface Transaction2 {
  readonly attribute Account2 from;
  readonly attribute Account2 to;
  readonly attribute float amount;
  readonly attribute DOMString description;
  readonly attribute unsigned long number;

  serializer = { from, to, amount, description };
};

interface Account2 {
  attribute DOMString name;
  attribute unsigned long number;
  serializer = number;
};

interface Account3 {
  attribute DOMString name;
  attribute unsigned long number;

  serializer = { attribute };
};

interface Account4 {
  getter object getItem(unsigned long index);
  serializer = { getter };
};

interface Account5 : Account {
  attribute DOMString secondname;
  serializer = { inherit, secondname };
};

interface Account6 : Account {
  attribute DOMString secondname;
  serializer = { inherit, attribute };
};

interface Account7 {
  attribute DOMString name;
  attribute unsigned long number;
  serializer = [ name, number ];
};

interface Account8 {
  getter object getItem(unsigned long index);
  serializer = [ getter ];
};