// https://dom.spec.whatwg.org/#interface-characterdata
[Exposed=Window]
interface CharacterData : Node {
  attribute [LegacyNullToEmptyString] DOMString data;
  readonly attribute unsigned long length;
  DOMString substringData(unsigned long offset, unsigned long count);
  undefined appendData(DOMString data);
  undefined insertData(unsigned long offset, DOMString data);
  undefined deleteData(unsigned long offset, unsigned long count);
  undefined replaceData(unsigned long offset, unsigned long count, DOMString data);
};
