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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
#include "mozilla/dom/HTMLLinkElement.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/Attributes.h"
#include "mozilla/Components.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/HTMLLinkElementBinding.h"
#include "mozilla/dom/HTMLDNSPrefetch.h"
#include "mozilla/dom/ReferrerInfo.h"
#include "mozilla/dom/ScriptLoader.h"
#include "nsContentUtils.h"
#include "nsDOMTokenList.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/Document.h"
#include "nsINode.h"
#include "nsIPrefetchService.h"
#include "nsISizeOf.h"
#include "nsPIDOMWindow.h"
#include "nsReadableUtils.h"
#include "nsStyleConsts.h"
#include "nsUnicharUtils.h"
#include "nsWindowSizes.h"
#include "nsIContentPolicy.h"
#include "nsMimeTypes.h"
#include "imgLoader.h"
#include "MediaContainerType.h"
#include "DecoderDoctorDiagnostics.h"
#include "DecoderTraits.h"
#include "MediaList.h"
#include "nsAttrValueInlines.h"
NS_IMPL_NS_NEW_HTML_ELEMENT(Link)
namespace mozilla::dom {
HTMLLinkElement::HTMLLinkElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsGenericHTMLElement(std::move(aNodeInfo)) {}
HTMLLinkElement::~HTMLLinkElement() { SupportsDNSPrefetch::Destroyed(*this); }
NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLLinkElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLLinkElement,
nsGenericHTMLElement)
tmp->LinkStyle::Traverse(cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRelList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSizes)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBlocking)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLLinkElement,
nsGenericHTMLElement)
tmp->LinkStyle::Unlink();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRelList)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSizes)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mBlocking)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(HTMLLinkElement,
nsGenericHTMLElement)
NS_IMPL_ELEMENT_CLONE(HTMLLinkElement)
bool HTMLLinkElement::Disabled() const {
return GetBoolAttr(nsGkAtoms::disabled);
}
void HTMLLinkElement::SetDisabled(bool aDisabled, ErrorResult& aRv) {
return SetHTMLBoolAttr(nsGkAtoms::disabled, aDisabled, aRv);
}
nsresult HTMLLinkElement::BindToTree(BindContext& aContext, nsINode& aParent) {
nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
NS_ENSURE_SUCCESS(rv, rv);
if (IsInComposedDoc()) {
TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
}
LinkStyle::BindToTree();
if (IsInUncomposedDoc()) {
if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
eIgnoreCase)) {
aContext.OwnerDoc().LocalizationLinkAdded(this);
}
LinkAdded();
}
return rv;
}
void HTMLLinkElement::LinkAdded() {
CreateAndDispatchEvent(u"DOMLinkAdded"_ns);
}
void HTMLLinkElement::UnbindFromTree(UnbindContext& aContext) {
CancelDNSPrefetch(*this);
CancelPrefetchOrPreload();
// If this is reinserted back into the document it will not be
// from the parser.
Document* oldDoc = GetUncomposedDoc();
ShadowRoot* oldShadowRoot = GetContainingShadow();
// We want to update the localization but only if the link is removed from a
// DOM change, and not because the document is going away.
bool ignore;
if (oldDoc) {
if (oldDoc->GetScriptHandlingObject(ignore) &&
AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
eIgnoreCase)) {
oldDoc->LocalizationLinkRemoved(this);
}
}
nsGenericHTMLElement::UnbindFromTree(aContext);
Unused << UpdateStyleSheetInternal(oldDoc, oldShadowRoot);
}
bool HTMLLinkElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult) {
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::crossorigin) {
ParseCORSValue(aValue, aResult);
return true;
}
if (aAttribute == nsGkAtoms::as) {
net::ParseAsValue(aValue, aResult);
return true;
}
if (aAttribute == nsGkAtoms::sizes) {
aResult.ParseAtomArray(aValue);
return true;
}
if (aAttribute == nsGkAtoms::integrity) {
aResult.ParseStringOrAtom(aValue);
return true;
}
if (aAttribute == nsGkAtoms::fetchpriority) {
ParseFetchPriority(aValue, aResult);
return true;
}
if (aAttribute == nsGkAtoms::blocking &&
StaticPrefs::dom_element_blocking_enabled()) {
aResult.ParseAtomArray(aValue);
return true;
}
}
return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
aMaybeScriptedPrincipal, aResult);
}
void HTMLLinkElement::CreateAndDispatchEvent(const nsAString& aEventName) {
MOZ_ASSERT(IsInUncomposedDoc());
// In the unlikely case that both rev is specified *and* rel=stylesheet,
// this code will cause the event to fire, on the principle that maybe the
// page really does want to specify that its author is a stylesheet. Since
// this should never actually happen and the performance hit is minimal,
// doing the "right" thing costs virtually nothing here, even if it doesn't
// make much sense.
static AttrArray::AttrValuesArray strings[] = {
nsGkAtoms::_empty, nsGkAtoms::stylesheet, nullptr};
if (!nsContentUtils::HasNonEmptyAttr(this, kNameSpaceID_None,
nsGkAtoms::rev) &&
FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::rel, strings,
eIgnoreCase) != AttrArray::ATTR_VALUE_NO_MATCH) {
return;
}
RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
this, aEventName, CanBubble::eYes, ChromeOnlyDispatch::eYes);
// Always run async in order to avoid running script when the content
// sink isn't expecting it.
asyncDispatcher->PostDOMEvent();
}
void HTMLLinkElement::BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
const nsAttrValue* aValue, bool aNotify) {
if (aNameSpaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::href || aName == nsGkAtoms::rel)) {
CancelDNSPrefetch(*this);
CancelPrefetchOrPreload();
}
return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName, aValue,
aNotify);
}
void HTMLLinkElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal,
bool aNotify) {
if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::href) {
mCachedURI = nullptr;
if (IsInUncomposedDoc()) {
CreateAndDispatchEvent(u"DOMLinkChanged"_ns);
}
mTriggeringPrincipal = nsContentUtils::GetAttrTriggeringPrincipal(
this, aValue ? aValue->GetStringValue() : EmptyString(),
aSubjectPrincipal);
// If the link has `rel=localization` and its `href` attribute is changed,
// update the list of localization links.
if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
eIgnoreCase)) {
if (Document* doc = GetUncomposedDoc()) {
if (aOldValue) {
doc->LocalizationLinkRemoved(this);
}
if (aValue) {
doc->LocalizationLinkAdded(this);
}
}
}
}
// If a link's `rel` attribute was changed from or to `localization`,
// update the list of localization links.
if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::rel) {
if (Document* doc = GetUncomposedDoc()) {
if ((aValue && aValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
(!aOldValue ||
!aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
doc->LocalizationLinkAdded(this);
} else if ((aOldValue &&
aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
(!aValue ||
!aValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
doc->LocalizationLinkRemoved(this);
}
}
}
if (aValue) {
if (aNameSpaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
aName == nsGkAtoms::type || aName == nsGkAtoms::as ||
aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::disabled)) {
bool dropSheet = false;
if (aName == nsGkAtoms::rel) {
nsAutoString value;
aValue->ToString(value);
uint32_t linkTypes = ParseLinkTypes(value);
if (GetSheet()) {
dropSheet = !(linkTypes & eSTYLESHEET);
}
}
if ((aName == nsGkAtoms::rel || aName == nsGkAtoms::href) &&
IsInComposedDoc()) {
TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
}
if ((aName == nsGkAtoms::as || aName == nsGkAtoms::type ||
aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::media) &&
IsInComposedDoc()) {
UpdatePreload(aName, aValue, aOldValue);
}
const bool forceUpdate =
dropSheet || aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
aName == nsGkAtoms::type || aName == nsGkAtoms::disabled;
Unused << UpdateStyleSheetInternal(
nullptr, nullptr, forceUpdate ? ForceUpdate::Yes : ForceUpdate::No);
}
} else {
if (aNameSpaceID == kNameSpaceID_None) {
if (aName == nsGkAtoms::disabled) {
mExplicitlyEnabled = true;
}
// Since removing href or rel makes us no longer link to a stylesheet,
// force updates for those too.
if (aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
aName == nsGkAtoms::type || aName == nsGkAtoms::disabled) {
Unused << UpdateStyleSheetInternal(nullptr, nullptr, ForceUpdate::Yes);
}
if ((aName == nsGkAtoms::as || aName == nsGkAtoms::type ||
aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::media) &&
IsInComposedDoc()) {
UpdatePreload(aName, aValue, aOldValue);
}
}
}
return nsGenericHTMLElement::AfterSetAttr(
aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}
// Keep this and the arrays below in sync with ToLinkMask in LinkStyle.cpp.
#define SUPPORTED_REL_VALUES_BASE \
"preload", "prefetch", "dns-prefetch", "stylesheet", "next", "alternate", \
"preconnect", "icon", "search", nullptr
static const DOMTokenListSupportedToken sSupportedRelValueCombinations[][12] = {
{SUPPORTED_REL_VALUES_BASE},
{"manifest", SUPPORTED_REL_VALUES_BASE},
{"modulepreload", SUPPORTED_REL_VALUES_BASE},
{"modulepreload", "manifest", SUPPORTED_REL_VALUES_BASE}};
#undef SUPPORTED_REL_VALUES_BASE
nsDOMTokenList* HTMLLinkElement::RelList() {
if (!mRelList) {
int index = (StaticPrefs::dom_manifest_enabled() ? 1 : 0) |
(StaticPrefs::network_modulepreload() ? 2 : 0);
mRelList = new nsDOMTokenList(this, nsGkAtoms::rel,
sSupportedRelValueCombinations[index]);
}
return mRelList;
}
Maybe<LinkStyle::SheetInfo> HTMLLinkElement::GetStyleSheetInfo() {
nsAutoString rel;
GetAttr(nsGkAtoms::rel, rel);
uint32_t linkTypes = ParseLinkTypes(rel);
if (!(linkTypes & eSTYLESHEET)) {
return Nothing();
}
if (!IsCSSMimeTypeAttributeForLinkElement(*this)) {
return Nothing();
}
if (Disabled()) {
return Nothing();
}
nsAutoString title;
nsAutoString media;
GetTitleAndMediaForElement(*this, title, media);
bool alternate = linkTypes & eALTERNATE;
if (alternate && title.IsEmpty()) {
// alternates must have title.
return Nothing();
}
if (!HasNonEmptyAttr(nsGkAtoms::href)) {
return Nothing();
}
nsAutoString integrity;
GetAttr(nsGkAtoms::integrity, integrity);
nsCOMPtr<nsIURI> uri = GetURI();
nsCOMPtr<nsIPrincipal> prin = mTriggeringPrincipal;
nsAutoString nonce;
nsString* cspNonce = static_cast<nsString*>(GetProperty(nsGkAtoms::nonce));
if (cspNonce) {
nonce = *cspNonce;
}
return Some(SheetInfo{
*OwnerDoc(),
this,
uri.forget(),
prin.forget(),
MakeAndAddRef<ReferrerInfo>(*this),
GetCORSMode(),
title,
media,
integrity,
nonce,
alternate ? HasAlternateRel::Yes : HasAlternateRel::No,
IsInline::No,
mExplicitlyEnabled ? IsExplicitlyEnabled::Yes : IsExplicitlyEnabled::No,
GetFetchPriority(),
});
}
void HTMLLinkElement::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
size_t* aNodeSize) const {
nsGenericHTMLElement::AddSizeOfExcludingThis(aSizes, aNodeSize);
if (nsCOMPtr<nsISizeOf> iface = do_QueryInterface(mCachedURI)) {
*aNodeSize += iface->SizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
}
}
JSObject* HTMLLinkElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return HTMLLinkElement_Binding::Wrap(aCx, this, aGivenProto);
}
void HTMLLinkElement::GetAs(nsAString& aResult) {
GetEnumAttr(nsGkAtoms::as, "", aResult);
}
void HTMLLinkElement::GetContentPolicyMimeTypeMedia(
nsAttrValue& aAsAttr, nsContentPolicyType& aPolicyType, nsString& aMimeType,
nsAString& aMedia) {
nsAutoString as;
GetAttr(nsGkAtoms::as, as);
net::ParseAsValue(as, aAsAttr);
aPolicyType = net::AsValueToContentPolicy(aAsAttr);
nsAutoString type;
GetAttr(nsGkAtoms::type, type);
nsAutoString notUsed;
nsContentUtils::SplitMimeType(type, aMimeType, notUsed);
GetAttr(nsGkAtoms::media, aMedia);
}
void HTMLLinkElement::
TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender() {
MOZ_ASSERT(IsInComposedDoc());
if (!HasAttr(nsGkAtoms::href)) {
return;
}
nsAutoString rel;
if (!GetAttr(nsGkAtoms::rel, rel)) {
return;
}
if (!nsContentUtils::PrefetchPreloadEnabled(OwnerDoc()->GetDocShell())) {
return;
}
uint32_t linkTypes = ParseLinkTypes(rel);
if ((linkTypes & ePREFETCH) || (linkTypes & eNEXT)) {
nsCOMPtr<nsIPrefetchService> prefetchService(
components::Prefetch::Service());
if (prefetchService) {
if (nsCOMPtr<nsIURI> uri = GetURI()) {
auto referrerInfo = MakeRefPtr<ReferrerInfo>(*this);
prefetchService->PrefetchURI(uri, referrerInfo, this,
linkTypes & ePREFETCH);
return;
}
}
}
if (linkTypes & ePRELOAD) {
if (nsCOMPtr<nsIURI> uri = GetURI()) {
nsContentPolicyType policyType;
nsAttrValue asAttr;
nsAutoString mimeType;
nsAutoString media;
GetContentPolicyMimeTypeMedia(asAttr, policyType, mimeType, media);
if (policyType == nsIContentPolicy::TYPE_INVALID ||
!net::CheckPreloadAttrs(asAttr, mimeType, media, OwnerDoc())) {
// Ignore preload with a wrong or empty as attribute.
net::WarnIgnoredPreload(*OwnerDoc(), *uri);
return;
}
StartPreload(policyType);
return;
}
}
if (linkTypes & eMODULE_PRELOAD) {
ScriptLoader* scriptLoader = OwnerDoc()->ScriptLoader();
ModuleLoader* moduleLoader = scriptLoader->GetModuleLoader();
if (!moduleLoader) {
// For the print preview documents, at this moment it doesn't have module
// loader yet, as the (print preview) document is not attached to the
// nsIDocumentViewer yet, so it doesn't have the GlobalObject.
// Also, the script elements won't be processed as they are also cloned
// from the original document.
// So we simply bail out if the module loader is null.
return;
}
if (!StaticPrefs::network_modulepreload()) {
// prior to main implementation of modulepreload
moduleLoader->DisallowImportMaps();
return;
}
// TODO: apply this check for all linkTypes
nsAutoString media;
if (GetAttr(nsGkAtoms::media, media)) {
RefPtr<mozilla::dom::MediaList> mediaList =
mozilla::dom::MediaList::Create(NS_ConvertUTF16toUTF8(media));
if (!mediaList->Matches(*OwnerDoc())) {
return;
}
}
// TODO: per spec, apply this check for ePREFETCH as well
if (!HasNonEmptyAttr(nsGkAtoms::href)) {
return;
}
nsAutoString as;
GetAttr(nsGkAtoms::as, as);
if (!net::IsScriptLikeOrInvalid(as)) {
RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
this, u"error"_ns, CanBubble::eNo, ChromeOnlyDispatch::eNo);
asyncDispatcher->PostDOMEvent();
return;
}
nsCOMPtr<nsIURI> uri = GetURI();
if (!uri) {
return;
}
// Step 1. Disallow further import maps given settings object.
moduleLoader->DisallowImportMaps();
StartPreload(nsIContentPolicy::TYPE_SCRIPT);
return;
}
if (linkTypes & ePRECONNECT) {
if (nsCOMPtr<nsIURI> uri = GetURI()) {
OwnerDoc()->MaybePreconnect(
uri, AttrValueToCORSMode(GetParsedAttr(nsGkAtoms::crossorigin)));
return;
}
}
if (linkTypes & eDNS_PREFETCH) {
TryDNSPrefetch(*this, HTMLDNSPrefetch::PrefetchSource::LinkDnsPrefetch);
}
}
void HTMLLinkElement::UpdatePreload(nsAtom* aName, const nsAttrValue* aValue,
const nsAttrValue* aOldValue) {
MOZ_ASSERT(IsInComposedDoc());
if (!HasAttr(nsGkAtoms::href)) {
return;
}
nsAutoString rel;
if (!GetAttr(nsGkAtoms::rel, rel)) {
return;
}
if (!nsContentUtils::PrefetchPreloadEnabled(OwnerDoc()->GetDocShell())) {
return;
}
uint32_t linkTypes = ParseLinkTypes(rel);
if (!(linkTypes & ePRELOAD)) {
return;
}
nsCOMPtr<nsIURI> uri = GetURI();
if (!uri) {
return;
}
nsAttrValue asAttr;
nsContentPolicyType asPolicyType;
nsAutoString mimeType;
nsAutoString media;
GetContentPolicyMimeTypeMedia(asAttr, asPolicyType, mimeType, media);
if (asPolicyType == nsIContentPolicy::TYPE_INVALID ||
!net::CheckPreloadAttrs(asAttr, mimeType, media, OwnerDoc())) {
// Ignore preload with a wrong or empty as attribute, but be sure to cancel
// the old one.
CancelPrefetchOrPreload();
net::WarnIgnoredPreload(*OwnerDoc(), *uri);
return;
}
if (aName == nsGkAtoms::crossorigin) {
CORSMode corsMode = AttrValueToCORSMode(aValue);
CORSMode oldCorsMode = AttrValueToCORSMode(aOldValue);
if (corsMode != oldCorsMode) {
CancelPrefetchOrPreload();
StartPreload(asPolicyType);
}
return;
}
nsContentPolicyType oldPolicyType;
if (aName == nsGkAtoms::as) {
if (aOldValue) {
oldPolicyType = net::AsValueToContentPolicy(*aOldValue);
if (!net::CheckPreloadAttrs(*aOldValue, mimeType, media, OwnerDoc())) {
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
}
} else {
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
}
} else if (aName == nsGkAtoms::type) {
nsAutoString oldType;
nsAutoString notUsed;
if (aOldValue) {
aOldValue->ToString(oldType);
}
nsAutoString oldMimeType;
nsContentUtils::SplitMimeType(oldType, oldMimeType, notUsed);
if (net::CheckPreloadAttrs(asAttr, oldMimeType, media, OwnerDoc())) {
oldPolicyType = asPolicyType;
} else {
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
}
} else {
MOZ_ASSERT(aName == nsGkAtoms::media);
nsAutoString oldMedia;
if (aOldValue) {
aOldValue->ToString(oldMedia);
}
if (net::CheckPreloadAttrs(asAttr, mimeType, oldMedia, OwnerDoc())) {
oldPolicyType = asPolicyType;
} else {
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
}
}
if (asPolicyType != oldPolicyType &&
oldPolicyType != nsIContentPolicy::TYPE_INVALID) {
CancelPrefetchOrPreload();
}
// Trigger a new preload if the policy type has changed.
if (asPolicyType != oldPolicyType) {
StartPreload(asPolicyType);
}
}
void HTMLLinkElement::CancelPrefetchOrPreload() {
CancelPreload();
nsCOMPtr<nsIPrefetchService> prefetchService(components::Prefetch::Service());
if (prefetchService) {
if (nsCOMPtr<nsIURI> uri = GetURI()) {
prefetchService->CancelPrefetchPreloadURI(uri, this);
}
}
}
void HTMLLinkElement::StartPreload(nsContentPolicyType aPolicyType) {
MOZ_ASSERT(!mPreload, "Forgot to cancel the running preload");
RefPtr<PreloaderBase> preload =
OwnerDoc()->Preloads().PreloadLinkElement(this, aPolicyType);
mPreload = preload.get();
}
void HTMLLinkElement::CancelPreload() {
if (mPreload) {
// This will cancel the loading channel if this was the last referred node
// and the preload is not used up until now to satisfy a regular tag load
// request.
mPreload->RemoveLinkPreloadNode(this);
mPreload = nullptr;
}
}
bool HTMLLinkElement::IsCSSMimeTypeAttributeForLinkElement(
const Element& aSelf) {
// Processing the type attribute per
// for HTML link elements.
nsAutoString type;
nsAutoString mimeType;
nsAutoString notUsed;
aSelf.GetAttr(nsGkAtoms::type, type);
nsContentUtils::SplitMimeType(type, mimeType, notUsed);
return mimeType.IsEmpty() || mimeType.LowerCaseEqualsLiteral("text/css");
}
nsDOMTokenList* HTMLLinkElement::Blocking() {
if (!mBlocking) {
mBlocking =
new nsDOMTokenList(this, nsGkAtoms::blocking, sSupportedBlockingValues);
}
return mBlocking;
}
bool HTMLLinkElement::IsPotentiallyRenderBlocking() {
return BlockingContainsRender();
// TODO: handle implicitly potentially render blocking
// The default type for resources given by the stylesheet keyword is text/css.
// A link element of this type is implicitly potentially render-blocking if
// the element was created by its node document's parser.
}
} // namespace mozilla::dom