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diff --git a/dom/webidl/XSLTProcessor.webidl b/dom/webidl/XSLTProcessor.webidl
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+++ b/dom/webidl/XSLTProcessor.webidl
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+typedef (unrestricted double or boolean or DOMString or Node or sequence<Node> or XPathResult) XSLTParameterValue;
+
+[Exposed=Window]
+interface XSLTProcessor {
+    [UseCounter]
+    constructor();
+
+    /**
+     * Import the stylesheet into this XSLTProcessor for transformations.
+     *
+     * @param style The root-node of a XSLT stylesheet. This can be either
+     *              a document node or an element node. If a document node
+     *              then the document can contain either a XSLT stylesheet
+     *              or a LRE stylesheet.
+     *              If the argument is an element node it must be the
+     *              xsl:stylesheet (or xsl:transform) element of an XSLT
+     *              stylesheet.
+     */
+    [Throws]
+    undefined importStylesheet(Node style);
+
+    /**
+     * Transforms the node source applying the stylesheet given by
+     * the importStylesheet() function. The owner document of the output node
+     * owns the returned document fragment.
+     *
+     * @param source The node to be transformed
+     * @param output This document is used to generate the output
+     * @return DocumentFragment The result of the transformation
+     */
+    [CEReactions, Throws]
+    DocumentFragment transformToFragment(Node source,
+                                         Document output);
+
+    /**
+     * Transforms the node source applying the stylesheet given by the
+     * importStylesheet() function.
+     *
+     * @param source The node to be transformed
+     * @return Document The result of the transformation
+     */
+    [CEReactions, Throws]
+    Document transformToDocument(Node source);
+
+    /**
+     * Sets a parameter to be used in subsequent transformations with this
+     * XSLTProcessor. If the parameter doesn't exist in the stylesheet the
+     * parameter will be ignored.
+     *
+     * @param namespaceURI The namespaceURI of the XSLT parameter
+     * @param localName    The local name of the XSLT parameter
+     * @param value        The new value of the XSLT parameter
+     */
+    [Throws]
+    undefined setParameter([LegacyNullToEmptyString] DOMString namespaceURI,
+                           DOMString localName,
+                           XSLTParameterValue value);
+
+    /**
+     * Gets a parameter if previously set by setParameter. Returns null
+     * otherwise.
+     *
+     * @param namespaceURI    The namespaceURI of the XSLT parameter
+     * @param localName       The local name of the XSLT parameter
+     * @return ParameterValue The value of the XSLT parameter
+     */
+    [Throws]
+    XSLTParameterValue? getParameter([LegacyNullToEmptyString] DOMString namespaceURI,
+                                     DOMString localName);
+    /**
+     * Removes a parameter, if set. This will make the processor use the
+     * default-value for the parameter as specified in the stylesheet.
+     *
+     * @param namespaceURI The namespaceURI of the XSLT parameter
+     * @param localName    The local name of the XSLT parameter
+     */
+    [Throws]
+    undefined removeParameter([LegacyNullToEmptyString] DOMString namespaceURI,
+                              DOMString localName);
+
+    /**
+     * Removes all set parameters from this XSLTProcessor. This will make
+     * the processor use the default-value for all parameters as specified in
+     * the stylesheet.
+     */
+    undefined clearParameters();
+
+    /**
+     * Remove all parameters and stylesheets from this XSLTProcessor.
+     */
+    undefined reset();
+
+    /**
+    * Disables all loading of external documents, such as from
+    * <xsl:import> and document()
+    * Defaults to off and is *not* reset by calls to reset()
+    */
+    [ChromeOnly]
+    const unsigned long DISABLE_ALL_LOADS = 1;
+
+    /**
+    * Flags for this processor. Defaults to 0. See individual flags above
+    * for documentation for effect of reset()
+    */
+    [ChromeOnly, NeedsCallerType]
+    attribute unsigned long flags;
+};