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diff --git a/dom/webidl/DOMParser.webidl b/dom/webidl/DOMParser.webidl
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+++ b/dom/webidl/DOMParser.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 http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://domparsing.spec.whatwg.org/#the-domparser-interface
+ */
+
+interface Principal;
+interface URI;
+interface InputStream;
+
+enum SupportedType {
+  "text/html",
+  "text/xml",
+  "application/xml",
+  "application/xhtml+xml",
+  "image/svg+xml"
+};
+
+[Exposed=Window]
+interface DOMParser {
+  [Throws]
+  constructor();
+
+  [NewObject, Throws]
+  Document parseFromString(DOMString str, SupportedType type);
+
+  [NewObject, ChromeOnly, Throws]
+  Document parseFromSafeString(DOMString str, SupportedType type);
+
+  // Mozilla-specific stuff
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromBuffer(sequence<octet> buf, SupportedType type);
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromBuffer(Uint8Array buf, SupportedType type);
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromStream(InputStream stream, DOMString? charset,
+                           long contentLength, SupportedType type);
+  // Can be used to allow a DOMParser to parse XUL/XBL no matter what
+  // principal it's using for the document.
+  [ChromeOnly]
+  void forceEnableXULXBL();
+
+  // Can be used to allow a DOMParser to load DTDs from URLs that
+  // normally would not be allowed based on the document principal.
+  [Func="IsChromeOrUAWidget"]
+  void forceEnableDTD();
+};
+