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diff --git a/dom/base/nsIContentInlines.h b/dom/base/nsIContentInlines.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 nsIContentInlines_h
+#define nsIContentInlines_h
+
+#include "nsIContent.h"
+#include "mozilla/dom/Document.h"
+#include "nsContentUtils.h"
+#include "nsAtom.h"
+#include "nsIFrame.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLSlotElement.h"
+#include "mozilla/dom/ShadowRoot.h"
+
+inline bool nsIContent::IsInHTMLDocument() const {
+ return OwnerDoc()->IsHTMLDocument();
+}
+
+inline bool nsIContent::IsInChromeDocument() const {
+ return nsContentUtils::IsChromeDoc(OwnerDoc());
+}
+
+inline void nsIContent::SetPrimaryFrame(nsIFrame* aFrame) {
+ MOZ_ASSERT(IsInUncomposedDoc() || IsInShadowTree(), "This will end badly!");
+
+ // <area> is known to trigger this, see bug 749326 and bug 135040.
+ MOZ_ASSERT(IsHTMLElement(nsGkAtoms::area) || !aFrame || !mPrimaryFrame ||
+ aFrame == mPrimaryFrame,
+ "Losing track of existing primary frame");
+
+ if (aFrame) {
+ MOZ_ASSERT(!aFrame->IsPlaceholderFrame());
+ if (MOZ_LIKELY(!IsHTMLElement(nsGkAtoms::area)) ||
+ aFrame->GetContent() == this) {
+ aFrame->SetIsPrimaryFrame(true);
+ }
+ } else if (nsIFrame* currentPrimaryFrame = GetPrimaryFrame()) {
+ if (MOZ_LIKELY(!IsHTMLElement(nsGkAtoms::area)) ||
+ currentPrimaryFrame->GetContent() == this) {
+ currentPrimaryFrame->SetIsPrimaryFrame(false);
+ }
+ }
+
+ mPrimaryFrame = aFrame;
+}
+
+inline mozilla::dom::ShadowRoot* nsIContent::GetShadowRoot() const {
+ if (!IsElement()) {
+ return nullptr;
+ }
+
+ return AsElement()->GetShadowRoot();
+}
+
+template <nsINode::FlattenedParentType aType>
+static inline nsINode* GetFlattenedTreeParentNode(const nsINode* aNode) {
+ if (!aNode->IsContent()) {
+ return nullptr;
+ }
+
+ nsINode* parent = aNode->GetParentNode();
+ if (!parent || !parent->IsContent()) {
+ return parent;
+ }
+
+ const nsIContent* content = aNode->AsContent();
+ nsIContent* parentAsContent = parent->AsContent();
+
+ if (aType == nsINode::eForStyle &&
+ content->IsRootOfNativeAnonymousSubtree() &&
+ parentAsContent == content->OwnerDoc()->GetRootElement()) {
+ const bool docLevel =
+ content->GetProperty(nsGkAtoms::docLevelNativeAnonymousContent);
+ return docLevel ? content->OwnerDocAsNode() : parent;
+ }
+
+ if (content->IsRootOfNativeAnonymousSubtree()) {
+ return parent;
+ }
+
+ if (parentAsContent->GetShadowRoot()) {
+ // If it's not assigned to any slot it's not part of the flat tree, and thus
+ // we return null.
+ return content->GetAssignedSlot();
+ }
+
+ if (parentAsContent->IsInShadowTree()) {
+ if (auto* slot = mozilla::dom::HTMLSlotElement::FromNode(parentAsContent)) {
+ // If the assigned nodes list is empty, we're fallback content which is
+ // active, otherwise we are not part of the flat tree.
+ return slot->AssignedNodes().IsEmpty() ? parent : nullptr;
+ }
+
+ if (auto* shadowRoot =
+ mozilla::dom::ShadowRoot::FromNode(parentAsContent)) {
+ return shadowRoot->GetHost();
+ }
+ }
+
+ // Common case.
+ return parent;
+}
+
+inline nsINode* nsINode::GetFlattenedTreeParentNode() const {
+ return ::GetFlattenedTreeParentNode<nsINode::eNotForStyle>(this);
+}
+
+inline nsIContent* nsIContent::GetFlattenedTreeParent() const {
+ nsINode* parent = GetFlattenedTreeParentNode();
+ return (parent && parent->IsContent()) ? parent->AsContent() : nullptr;
+}
+
+inline bool nsIContent::IsEventAttributeName(nsAtom* aName) {
+ const char16_t* name = aName->GetUTF16String();
+ if (name[0] != 'o' || name[1] != 'n') {
+ return false;
+ }
+
+ return IsEventAttributeNameInternal(aName);
+}
+
+inline nsINode* nsINode::GetFlattenedTreeParentNodeForStyle() const {
+ return ::GetFlattenedTreeParentNode<nsINode::eForStyle>(this);
+}
+
+inline bool nsINode::NodeOrAncestorHasDirAuto() const {
+ return AncestorHasDirAuto() || (IsElement() && AsElement()->HasDirAuto());
+}
+
+inline bool nsINode::IsEditable() const {
+ if (HasFlag(NODE_IS_EDITABLE)) {
+ // The node is in an editable contentEditable subtree.
+ return true;
+ }
+
+ // All editable anonymous content should be made explicitly editable via the
+ // NODE_IS_EDITABLE flag.
+ if (IsInNativeAnonymousSubtree()) {
+ return false;
+ }
+
+ // Check if the node is in a document and the document is in designMode.
+ return IsInDesignMode();
+}
+
+inline bool nsINode::IsInDesignMode() const {
+ if (!OwnerDoc()->HasFlag(NODE_IS_EDITABLE)) {
+ return false;
+ }
+
+ if (IsDocument()) {
+ return HasFlag(NODE_IS_EDITABLE);
+ }
+
+ // NOTE(emilio): If you change this to be the composed doc you also need to
+ // change NotifyEditableStateChange() in Document.cpp.
+ // NOTE(masayuki): Perhaps, we should keep this behavior because of
+ // web-compat.
+ if (IsInUncomposedDoc() && GetUncomposedDoc()->HasFlag(NODE_IS_EDITABLE)) {
+ return true;
+ }
+
+ // FYI: In design mode, form controls don't work as usual. For example,
+ // <input type=text> isn't focusable but can be deleted and replaced
+ // with typed text. <select> is also not focusable but always selected
+ // all to be deleted or replaced. On the other hand, newer controls
+ // don't behave as the traditional controls. For example, data/time
+ // picker can be opened and change the value from the picker. And also
+ // the buttons of <video controls> work as usual. On the other hand,
+ // their UI (i.e., nodes in their shadow tree) are not editable.
+ // Therefore, we need special handling for nodes in anonymous subtree
+ // unless we fix <https://bugzilla.mozilla.org/show_bug.cgi?id=1734512>.
+
+ // If the shadow host is not in design mode, this can never be in design
+ // mode. Otherwise, the content is never editable by design mode of
+ // composed document. If we're in a native anonymous subtree, we should
+ // consider it with the host.
+ if (IsInNativeAnonymousSubtree()) {
+ nsIContent* host = GetClosestNativeAnonymousSubtreeRootParentOrHost();
+ MOZ_DIAGNOSTIC_ASSERT(host != this);
+ return host && host->IsInDesignMode();
+ }
+
+ // Otherwise, i.e., when it's in a shadow tree which is not created by us,
+ // the node is not editable by design mode (but it's possible that it may be
+ // editable if this node is in `contenteditable` element in the shadow tree).
+ return false;
+}
+
+inline void nsIContent::HandleInsertionToOrRemovalFromSlot() {
+ using mozilla::dom::HTMLSlotElement;
+
+ MOZ_ASSERT(GetParentElement());
+ if (!IsInShadowTree() || IsRootOfNativeAnonymousSubtree()) {
+ return;
+ }
+ HTMLSlotElement* slot = HTMLSlotElement::FromNode(mParent);
+ if (!slot) {
+ return;
+ }
+ // If parent's root is a shadow root, and parent is a slot whose
+ // assigned nodes is the empty list, then run signal a slot change for
+ // parent.
+ if (slot->AssignedNodes().IsEmpty()) {
+ slot->EnqueueSlotChangeEvent();
+ }
+}
+
+inline void nsIContent::HandleShadowDOMRelatedInsertionSteps(bool aHadParent) {
+ using mozilla::dom::Element;
+ using mozilla::dom::ShadowRoot;
+
+ if (!aHadParent) {
+ if (Element* parentElement = Element::FromNode(mParent)) {
+ if (ShadowRoot* shadow = parentElement->GetShadowRoot()) {
+ shadow->MaybeSlotHostChild(*this);
+ }
+ HandleInsertionToOrRemovalFromSlot();
+ }
+ }
+}
+
+inline void nsIContent::HandleShadowDOMRelatedRemovalSteps(bool aNullParent) {
+ using mozilla::dom::Element;
+ using mozilla::dom::ShadowRoot;
+
+ if (aNullParent) {
+ // FIXME(emilio, bug 1577141): FromNodeOrNull rather than just FromNode
+ // because XBL likes to call UnbindFromTree at very odd times (with already
+ // disconnected anonymous content subtrees).
+ if (Element* parentElement = Element::FromNodeOrNull(mParent)) {
+ if (ShadowRoot* shadow = parentElement->GetShadowRoot()) {
+ shadow->MaybeUnslotHostChild(*this);
+ }
+ HandleInsertionToOrRemovalFromSlot();
+ }
+ }
+}
+
+#endif // nsIContentInlines_h