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diff --git a/components/script_bindings/webidls/XMLHttpRequest.webidl b/components/script_bindings/webidls/XMLHttpRequest.webidl
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://xhr.spec.whatwg.org/#interface-xmlhttprequest
+ *
+ * To the extent possible under law, the editor has waived all copyright
+ * and related or neighboring rights to this work. In addition, as of 1 May 2014,
+ * the editor has made this specification available under the Open Web Foundation
+ * Agreement Version 1.0, which is available at
+ * http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0.
+ */
+
+// https://fetch.spec.whatwg.org/#typedefdef-xmlhttprequestbodyinit
+typedef (Blob or BufferSource or FormData or DOMString or URLSearchParams) XMLHttpRequestBodyInit;
+
+// https://fetch.spec.whatwg.org/#bodyinit
+typedef (ReadableStream or XMLHttpRequestBodyInit) BodyInit;
+
+enum XMLHttpRequestResponseType {
+  "",
+  "arraybuffer",
+  "blob",
+  "document",
+  "json",
+  "text",
+};
+
+[Exposed=(Window,Worker)]
+interface XMLHttpRequest : XMLHttpRequestEventTarget {
+  [Throws] 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
+  [Throws]
+  undefined open(ByteString method, USVString url);
+  [Throws]
+  undefined open(ByteString method, USVString url, boolean async,
+            optional USVString? username = null,
+            optional USVString? password = null);
+
+  [Throws]
+  undefined setRequestHeader(ByteString name, ByteString value);
+  [SetterThrows]
+           attribute unsigned long timeout;
+  [SetterThrows]
+           attribute boolean withCredentials;
+  readonly attribute XMLHttpRequestUpload upload;
+  [Throws]
+  undefined send(optional (Document or XMLHttpRequestBodyInit)? data = null);
+  undefined abort();
+
+  // response
+  readonly attribute USVString responseURL;
+  readonly attribute unsigned short status;
+  readonly attribute ByteString statusText;
+  ByteString? getResponseHeader(ByteString name);
+  ByteString getAllResponseHeaders();
+  [Throws]
+  undefined overrideMimeType(DOMString mime);
+  [SetterThrows]
+           attribute XMLHttpRequestResponseType responseType;
+  readonly attribute any response;
+  [Throws]
+  readonly attribute USVString responseText;
+  [Throws, Exposed=Window] readonly attribute Document? responseXML;
+};