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diff --git a/dom/webidl/ElementInternals.webidl b/dom/webidl/ElementInternals.webidl
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+++ b/dom/webidl/ElementInternals.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://html.spec.whatwg.org/#elementinternals
+ */
+
+[Exposed=Window]
+interface ElementInternals {
+  // Shadow root access
+  readonly attribute ShadowRoot? shadowRoot;
+
+  // Form-associated custom elements
+  [Throws]
+  undefined setFormValue((File or USVString or FormData)? value,
+                         optional (File or USVString or FormData)? state);
+
+  [Throws]
+  readonly attribute HTMLFormElement? form;
+
+  [Throws]
+  undefined setValidity(optional ValidityStateFlags flags = {},
+                        optional DOMString message,
+                        optional HTMLElement anchor);
+  [Throws]
+  readonly attribute boolean willValidate;
+  [Throws]
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  [Throws]
+  boolean checkValidity();
+  [Throws]
+  boolean reportValidity();
+
+  [Throws]
+  readonly attribute NodeList labels;
+};
+
+partial interface ElementInternals {
+  [ChromeOnly, Throws]
+  readonly attribute HTMLElement? validationAnchor;
+};
+
+ElementInternals includes AccessibilityRole;
+ElementInternals includes AriaAttributes;
+
+dictionary ValidityStateFlags {
+  boolean valueMissing = false;
+  boolean typeMismatch = false;
+  boolean patternMismatch = false;
+  boolean tooLong = false;
+  boolean tooShort = false;
+  boolean rangeUnderflow = false;
+  boolean rangeOverflow = false;
+  boolean stepMismatch = false;
+  boolean badInput = false;
+  boolean customError = false;
+};