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diff --git a/dom/html/HTMLSourceElement.h b/dom/html/HTMLSourceElement.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_HTMLSourceElement_h
+#define mozilla_dom_HTMLSourceElement_h
+
+#include "mozilla/Attributes.h"
+#include "nsGenericHTMLElement.h"
+#include "mozilla/dom/HTMLMediaElement.h"
+
+class nsAttrValue;
+
+namespace mozilla::dom {
+
+class MediaList;
+
+class HTMLSourceElement final : public nsGenericHTMLElement {
+ public:
+ explicit HTMLSourceElement(
+ already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+
+ // nsISupports
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLSourceElement,
+ nsGenericHTMLElement)
+
+ NS_IMPL_FROMNODE_HTML_WITH_TAG(HTMLSourceElement, source)
+
+ nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+
+ // Override BindToTree() so that we can trigger a load when we add a
+ // child source element.
+ nsresult BindToTree(BindContext&, nsINode& aParent) override;
+
+ void UnbindFromTree(bool aNullParent) override;
+
+ // If this element's media attr matches for its owner document. Returns true
+ // if no media attr was set.
+ bool MatchesCurrentMedia();
+
+ // True if a source tag would match the given media attribute for the
+ // specified document. Used by the preloader to determine valid <source> tags
+ // prior to DOM creation.
+ static bool WouldMatchMediaForDocument(const nsAString& aMediaStr,
+ const Document* aDocument);
+
+ // Return the MediaSource object if any associated with the src attribute
+ // when it was set.
+ MediaSource* GetSrcMediaSource() { return mSrcMediaSource; };
+
+ // WebIDL
+ void GetSrc(nsString& aSrc) { GetURIAttr(nsGkAtoms::src, nullptr, aSrc); }
+ void SetSrc(const nsAString& aSrc, nsIPrincipal* aTriggeringPrincipal,
+ mozilla::ErrorResult& rv) {
+ SetHTMLAttr(nsGkAtoms::src, aSrc, aTriggeringPrincipal, rv);
+ }
+
+ nsIPrincipal* GetSrcTriggeringPrincipal() const {
+ return mSrcTriggeringPrincipal;
+ }
+
+ nsIPrincipal* GetSrcsetTriggeringPrincipal() const {
+ return mSrcsetTriggeringPrincipal;
+ }
+
+ void GetType(DOMString& aType) { GetHTMLAttr(nsGkAtoms::type, aType); }
+ void SetType(const nsAString& aType, ErrorResult& rv) {
+ SetHTMLAttr(nsGkAtoms::type, aType, rv);
+ }
+
+ void GetSrcset(DOMString& aSrcset) {
+ GetHTMLAttr(nsGkAtoms::srcset, aSrcset);
+ }
+ void SetSrcset(const nsAString& aSrcset, nsIPrincipal* aTriggeringPrincipal,
+ mozilla::ErrorResult& rv) {
+ SetHTMLAttr(nsGkAtoms::srcset, aSrcset, aTriggeringPrincipal, rv);
+ }
+
+ void GetSizes(DOMString& aSizes) { GetHTMLAttr(nsGkAtoms::sizes, aSizes); }
+ void SetSizes(const nsAString& aSizes, mozilla::ErrorResult& rv) {
+ SetHTMLAttr(nsGkAtoms::sizes, aSizes, rv);
+ }
+
+ void GetMedia(DOMString& aMedia) { GetHTMLAttr(nsGkAtoms::media, aMedia); }
+ void SetMedia(const nsAString& aMedia, mozilla::ErrorResult& rv) {
+ SetHTMLAttr(nsGkAtoms::media, aMedia, rv);
+ }
+
+ uint32_t Width() const {
+ return GetDimensionAttrAsUnsignedInt(nsGkAtoms::width, 0);
+ }
+ void SetWidth(uint32_t aWidth, ErrorResult& aRv) {
+ SetUnsignedIntAttr(nsGkAtoms::width, aWidth, 0, aRv);
+ }
+
+ uint32_t Height() const {
+ return GetDimensionAttrAsUnsignedInt(nsGkAtoms::height, 0);
+ }
+ void SetHeight(uint32_t aHeight, ErrorResult& aRv) {
+ SetUnsignedIntAttr(nsGkAtoms::height, aHeight, 0, aRv);
+ }
+
+ const StyleLockedDeclarationBlock* GetAttributesMappedForImage() const {
+ return mMappedAttributesForImage;
+ }
+
+ static bool IsAttributeMappedToImages(const nsAtom* aAttribute) {
+ return aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height;
+ }
+
+ protected:
+ virtual ~HTMLSourceElement();
+
+ JSObject* WrapNode(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) override;
+
+ bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
+ const nsAString& aValue,
+ nsIPrincipal* aMaybeScriptedPrincipal,
+ nsAttrValue& aResult) override;
+
+ void AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+ const nsAttrValue* aValue, const nsAttrValue* aOldValue,
+ nsIPrincipal* aMaybeScriptedPrincipal,
+ bool aNotify) override;
+
+ private:
+ // Generates a new MediaList using the given input
+ void UpdateMediaList(const nsAttrValue* aValue);
+
+ void BuildMappedAttributesForImage();
+
+ bool IsInPicture() const {
+ return GetParentElement() &&
+ GetParentElement()->IsHTMLElement(nsGkAtoms::picture);
+ }
+
+ RefPtr<MediaList> mMediaList;
+ RefPtr<MediaSource> mSrcMediaSource;
+
+ // The triggering principal for the src attribute.
+ nsCOMPtr<nsIPrincipal> mSrcTriggeringPrincipal;
+
+ // The triggering principal for the srcset attribute.
+ nsCOMPtr<nsIPrincipal> mSrcsetTriggeringPrincipal;
+
+ // The mapped attributes to HTMLImageElement if we are associated with a
+ // <picture> with a valid <img>.
+ RefPtr<StyleLockedDeclarationBlock> mMappedAttributesForImage;
+};
+
+} // namespace mozilla::dom
+
+#endif // mozilla_dom_HTMLSourceElement_h