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diff --git a/dom/webidl/HTMLSelectElement.webidl b/dom/webidl/HTMLSelectElement.webidl
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+++ b/dom/webidl/HTMLSelectElement.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
+ * http://www.whatwg.org/html/#the-select-element
+ */
+
+[Exposed=Window]
+interface HTMLSelectElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString autocomplete;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean disabled;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean multiple;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean required;
+  [CEReactions, SetterThrows, Pure]
+  attribute unsigned long size;
+
+  [Pure]
+  readonly attribute DOMString type;
+
+  [Constant]
+  readonly attribute HTMLOptionsCollection options;
+  [CEReactions, SetterThrows, Pure]
+  attribute unsigned long length;
+  getter Element? item(unsigned long index);
+  HTMLOptionElement? namedItem(DOMString name);
+  [CEReactions, Throws]
+  undefined add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+  [CEReactions]
+  undefined remove(long index);
+  [CEReactions, Throws]
+  setter undefined (unsigned long index, HTMLOptionElement? option);
+
+  readonly attribute HTMLCollection selectedOptions;
+  [Pure]
+  attribute long selectedIndex;
+  [Pure]
+  attribute DOMString value;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  undefined setCustomValidity(DOMString error);
+
+  [Throws, Pref="dom.select.showPicker.enabled"]
+  undefined showPicker();
+
+  readonly attribute NodeList labels;
+
+  // https://www.w3.org/Bugs/Public/show_bug.cgi?id=20720
+  [CEReactions]
+  undefined remove();
+};
+
+// Chrome only interface
+
+partial interface HTMLSelectElement {
+  [ChromeOnly]
+  undefined userFinishedInteracting(boolean changed);
+  [ChromeOnly, Pure]
+  readonly attribute boolean isCombobox;
+  [ChromeOnly]
+  attribute boolean openInParentProcess;
+  [ChromeOnly]
+  AutocompleteInfo getAutocompleteInfo();
+  [ChromeOnly]
+  attribute DOMString previewValue;
+};