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diff --git a/dom/webidl/Sanitizer.webidl b/dom/webidl/Sanitizer.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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
+ * https://wicg.github.io/sanitizer-api/#sanitizer
+ * https://wicg.github.io/sanitizer-api/#config
+ *
+ * * Copyright © 2020 the Contributors to the HTML Sanitizer API Specification,
+ * published by the Web Platform Incubator Community Group under the W3C Community Contributor License Agreement (CLA).
+ */
+
+// NOTE: This IDL is still under development:
+// https://github.com/WICG/sanitizer-api/issues/181
+
+
+dictionary SanitizerElementNamespace {
+  required DOMString name;
+  DOMString? _namespace = "http://www.w3.org/1999/xhtml";
+};
+
+// Used by "elements"
+dictionary SanitizerElementNamespaceWithAttributes : SanitizerElementNamespace {
+  sequence<SanitizerAttribute> attributes;
+  sequence<SanitizerAttribute> removeAttributes;
+};
+
+typedef (DOMString or SanitizerElementNamespace) SanitizerElement;
+typedef (DOMString or SanitizerElementNamespaceWithAttributes) SanitizerElementWithAttributes;
+
+dictionary SanitizerAttributeNamespace {
+  required DOMString name;
+  DOMString? _namespace = null;
+};
+typedef (DOMString or SanitizerAttributeNamespace) SanitizerAttribute;
+
+dictionary SanitizerConfig {
+  sequence<SanitizerElementWithAttributes> elements;
+  sequence<SanitizerElement> removeElements;
+  sequence<SanitizerElement> replaceWithChildrenElements;
+
+  sequence<SanitizerAttribute> attributes;
+  sequence<SanitizerAttribute> removeAttributes;
+
+  boolean customElements;
+  boolean unknownMarkup; // Name TBD!
+  boolean comments;
+};
+
+typedef (DocumentFragment or Document) SanitizerInput;
+
+[Exposed=Window, SecureContext, Pref="dom.security.sanitizer.enabled"]
+interface Sanitizer {
+  [Throws, UseCounter]
+  constructor(optional SanitizerConfig sanitizerConfig = {});
+  [UseCounter, Throws]
+  DocumentFragment sanitize(SanitizerInput input);
+};