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diff --git a/dom/html/HTMLStyleElement.h b/dom/html/HTMLStyleElement.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_dom_HTMLStyleElement_h
+#define mozilla_dom_HTMLStyleElement_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/LinkStyle.h"
+#include "nsGenericHTMLElement.h"
+#include "nsStubMutationObserver.h"
+
+class nsDOMTokenList;
+
+namespace mozilla::dom {
+
+class HTMLStyleElement final : public nsGenericHTMLElement,
+ public LinkStyle,
+ public nsStubMutationObserver {
+ public:
+ explicit HTMLStyleElement(
+ already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+
+ // nsISupports
+ NS_DECL_ISUPPORTS_INHERITED
+
+ // CC
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLStyleElement,
+ nsGenericHTMLElement)
+
+ void GetInnerHTML(nsAString& aInnerHTML, OOMReporter& aError) override;
+ using nsGenericHTMLElement::SetInnerHTML;
+ virtual void SetInnerHTML(const nsAString& aInnerHTML,
+ nsIPrincipal* aSubjectPrincipal,
+ mozilla::ErrorResult& aError) override;
+ virtual void SetTextContentInternal(const nsAString& aTextContent,
+ nsIPrincipal* aSubjectPrincipal,
+ mozilla::ErrorResult& aError) override;
+ /**
+ * 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.
+ */
+ void SetDevtoolsAsTriggeringPrincipal();
+
+ virtual nsresult BindToTree(BindContext&, nsINode& aParent) override;
+ virtual void UnbindFromTree(bool aNullParent = true) override;
+ virtual void AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+ const nsAttrValue* aValue,
+ const nsAttrValue* aOldValue,
+ nsIPrincipal* aSubjectPrincipal,
+ bool aNotify) override;
+
+ virtual nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+
+ // nsIMutationObserver
+ NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+
+ bool Disabled() const;
+ void SetDisabled(bool aDisabled);
+ void GetMedia(nsAString& aValue) { GetHTMLAttr(nsGkAtoms::media, aValue); }
+ void SetMedia(const nsAString& aMedia, ErrorResult& aError) {
+ SetHTMLAttr(nsGkAtoms::media, aMedia, aError);
+ }
+ void GetType(nsAString& aValue) { GetHTMLAttr(nsGkAtoms::type, aValue); }
+ void SetType(const nsAString& aType, ErrorResult& aError) {
+ SetHTMLAttr(nsGkAtoms::type, aType, aError);
+ }
+
+ nsDOMTokenList* Blocking();
+
+ virtual JSObject* WrapNode(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) override;
+
+ protected:
+ virtual ~HTMLStyleElement();
+
+ nsIContent& AsContent() final { return *this; }
+ const LinkStyle* AsLinkStyle() const final { return this; }
+ Maybe<SheetInfo> GetStyleSheetInfo() final;
+
+ /**
+ * Common method to call from the various mutation observer methods.
+ * aContent is a content node that's either the one that changed or its
+ * parent; we should only respond to the change if aContent is non-anonymous.
+ */
+ void ContentChanged(nsIContent* aContent);
+
+ RefPtr<nsDOMTokenList> mBlocking;
+};
+
+} // namespace mozilla::dom
+
+#endif