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diff --git a/dom/webidl/HTMLStyleElement.webidl b/dom/webidl/HTMLStyleElement.webidl
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+++ b/dom/webidl/HTMLStyleElement.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/specs/web-apps/current-work/#the-style-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ */
+
+[Exposed=Window]
+interface HTMLStyleElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [Pure]
+           attribute boolean disabled;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString media;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+           [Pref="dom.element.blocking.enabled", SameObject, PutForwards=value]
+           readonly attribute DOMTokenList blocking;
+};
+HTMLStyleElement includes LinkStyle;
+
+// Mozilla-specific additions to support devtools
+partial interface HTMLStyleElement {
+  /**
+   * Mark this style element with a devtools-specific principal that
+   * skips Content Security Policy unsafe-inline checks. This triggering
+   * principal will be overwritten by any callers that set textContent
+   * or innerHTML on this element.
+   */
+  [ChromeOnly]
+  undefined setDevtoolsAsTriggeringPrincipal();
+};