[Exposed=(Window,DedicatedWorker,SharedWorker)]
interface XMLHttpRequestEventTarget : EventTarget {
  // event handlers
  attribute EventHandler onloadstart;
  attribute EventHandler onprogress;
  attribute EventHandler onabort;
  attribute EventHandler onerror;
  attribute EventHandler onload;
  attribute EventHandler ontimeout;
  attribute EventHandler onloadend;
};

[Exposed=(Window,DedicatedWorker,SharedWorker)]
interface XMLHttpRequestUpload : XMLHttpRequestEventTarget {
};

enum XMLHttpRequestResponseType {
  ""
,
  "arraybuffer"
,
  "blob"
,
  "document"
,
  "json"
,
  "text"

};

[Exposed=(Window,DedicatedWorker,SharedWorker)]
interface XMLHttpRequest : XMLHttpRequestEventTarget {
  constructor();

  // event handler
  attribute EventHandler onreadystatechange;

  // states
  const unsigned short UNSENT = 0;
  const unsigned short OPENED = 1;
  const unsigned short HEADERS_RECEIVED = 2;
  const unsigned short LOADING = 3;
  const unsigned short DONE = 4;
  readonly attribute unsigned short readyState;

  // request
  undefined open(ByteString method
, USVString url
);
  undefined open(ByteString method
, USVString url
, boolean async
, optional USVString? username
 = null, optional USVString? password
 = null);
  undefined setRequestHeader(ByteString name
, ByteString value
);
           attribute unsigned long timeout;
           attribute boolean withCredentials;
  [SameObject] readonly attribute XMLHttpRequestUpload upload;
  undefined send(optional (Document or XMLHttpRequestBodyInit)? body
 = null);
  undefined abort();

  // response
  readonly attribute USVString responseURL;
  readonly attribute unsigned short status;
  readonly attribute ByteString statusText;
  ByteString? getResponseHeader(ByteString name
);
  ByteString getAllResponseHeaders();
  undefined overrideMimeType(DOMString mime
);
           attribute XMLHttpRequestResponseType responseType;
  readonly attribute any response;
  readonly attribute USVString responseText;
  [Exposed=Window] readonly attribute Document? responseXML;
};