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* Copyright (C) 1999 Lars Knoll (
* (C) 1999 Antti Koivisto (
* Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2011 Google Inc. All rights reserved.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
#include <memory>
#include "base/single_thread_task_runner.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/create_element_flags.h"
#include "third_party/blink/renderer/core/dom/dom_token_list.h"
#include "third_party/blink/renderer/core/dom/increment_load_event_delay_count.h"
#include "third_party/blink/renderer/core/html/html_element.h"
#include "third_party/blink/renderer/core/html/link_rel_attribute.h"
#include "third_party/blink/renderer/core/html/link_resource.h"
#include "third_party/blink/renderer/core/html/link_style.h"
#include "third_party/blink/renderer/core/html/rel_list.h"
#include "third_party/blink/renderer/core/loader/link_loader.h"
#include "third_party/blink/renderer/core/loader/link_loader_client.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_member.h"
#include "third_party/blink/renderer/platform/loader/fetch/fetch_parameters.h"
namespace blink {
class KURL;
class LinkImport;
struct LinkLoadParameters;
class CORE_EXPORT HTMLLinkElement final : public HTMLElement,
public LinkLoaderClient {
static HTMLLinkElement* Create(Document&, const CreateElementFlags);
HTMLLinkElement(Document&, const CreateElementFlags);
~HTMLLinkElement() override;
// Returns attributes that should be checked against Trusted Types
const HashSet<AtomicString>& GetCheckedAttributeNames() const override;
KURL Href() const;
const AtomicString& Rel() const;
String Media() const { return media_; }
String TypeValue() const { return type_; }
String AsValue() const { return as_; }
String IntegrityValue() const { return integrity_; }
String ImportanceValue() const { return importance_; }
network::mojom::ReferrerPolicy GetReferrerPolicy() const {
return referrer_policy_;
const LinkRelAttribute& RelAttribute() const { return rel_attribute_; }
DOMTokenList& relList() const {
return static_cast<DOMTokenList&>(*rel_list_);
String Scope() const { return scope_; }
const AtomicString& GetType() const;
IconType GetIconType() const;
// the icon sizes as parsed from the HTML attribute
const Vector<IntSize>& IconSizes() const;
bool Async() const;
CSSStyleSheet* sheet() const {
return GetLinkStyle() ? GetLinkStyle()->Sheet() : nullptr;
Document* import() const;
bool StyleSheetIsLoading() const;
bool IsImport() const { return GetLinkImport(); }
bool IsDisabled() const {
return GetLinkStyle() && GetLinkStyle()->IsDisabled();
bool IsEnabledViaScript() const {
return GetLinkStyle() && GetLinkStyle()->IsEnabledViaScript();
DOMTokenList* sizes() const;
void ScheduleEvent();
// From LinkLoaderClient
bool ShouldLoadLink() override;
bool IsLinkCreatedByParser() override;
// For LinkStyle
bool LoadLink(const LinkLoadParameters&);
void LoadStylesheet(const LinkLoadParameters&,
const WTF::TextEncoding&,
bool IsAlternate() const {
return GetLinkStyle()->IsUnset() && rel_attribute_.IsAlternate();
bool ShouldProcessStyle() {
return LinkResourceToProcess() && GetLinkStyle();
bool IsCreatedByParser() const { return created_by_parser_; }
void Trace(blink::Visitor*) override;
LinkStyle* GetLinkStyle() const;
LinkImport* GetLinkImport() const;
LinkResource* LinkResourceToProcess();
void Process();
static void ProcessCallback(Node*);
// Always call this asynchronously because this can cause synchronous
// Document load event and JavaScript execution.
void DispatchPendingEvent(std::unique_ptr<IncrementLoadEventDelayCount>);
// From Node and subclassses
void ParseAttribute(const AttributeModificationParams&) override;
InsertionNotificationRequest InsertedInto(ContainerNode&) override;
void RemovedFrom(ContainerNode&) override;
bool IsURLAttribute(const Attribute&) const override;
bool HasLegalLinkAttribute(const QualifiedName&) const override;
const QualifiedName& SubResourceAttributeName() const override;
bool SheetLoaded() override;
void NotifyLoadedSheetAndAllCriticalSubresources(
LoadedSheetErrorStatus) override;
void StartLoadingDynamicSheet() override;
void FinishParsingChildren() override;
bool HasActivationBehavior() const override;
// From LinkLoaderClient
void LinkLoaded() override;
void LinkLoadingErrored() override;
void DidStartLinkPrerender() override;
void DidStopLinkPrerender() override;
void DidSendLoadForLinkPrerender() override;
void DidSendDOMContentLoadedForLinkPrerender() override;
scoped_refptr<base::SingleThreadTaskRunner> GetLoadingTaskRunner() override;
Member<LinkResource> link_;
Member<LinkLoader> link_loader_;
String type_;
String as_;
String media_;
String integrity_;
String importance_;
network::mojom::ReferrerPolicy referrer_policy_;
Member<DOMTokenList> sizes_;
Vector<IntSize> icon_sizes_;
TraceWrapperMember<RelList> rel_list_;
LinkRelAttribute rel_attribute_;
String scope_;
bool created_by_parser_;
} // namespace blink