1 files changed, 622 insertions, 0 deletions
diff --git a/accessible/base/nsCoreUtils.cpp b/accessible/base/nsCoreUtils.cpp
new file mode 100644
index 0000000000..80739bb401
--- /dev/null
+++ b/accessible/base/nsCoreUtils.cpp
@@ -0,0 +1,622 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "nsCoreUtils.h"
+
+#include "nsAttrValue.h"
+#include "nsIAccessibleTypes.h"
+
+#include "mozilla/dom/Document.h"
+#include "nsAccUtils.h"
+#include "nsRange.h"
+#include "nsXULElement.h"
+#include "nsIDocShell.h"
+#include "nsIObserverService.h"
+#include "nsPresContext.h"
+#include "nsIScrollableFrame.h"
+#include "nsISelectionController.h"
+#include "nsISimpleEnumerator.h"
+#include "mozilla/dom/TouchEvent.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/EventListenerManager.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/TouchEvents.h"
+#include "nsView.h"
+#include "nsGkAtoms.h"
+
+#include "nsComponentManagerUtils.h"
+
+#include "XULTreeElement.h"
+#include "nsIContentInlines.h"
+#include "nsTreeColumns.h"
+#include "mozilla/dom/DocumentInlines.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLLabelElement.h"
+#include "mozilla/dom/MouseEventBinding.h"
+#include "mozilla/dom/Selection.h"
+
+using namespace mozilla;
+
+using mozilla::dom::DOMRect;
+using mozilla::dom::Element;
+using mozilla::dom::Selection;
+using mozilla::dom::XULTreeElement;
+
+using mozilla::a11y::nsAccUtils;
+
+////////////////////////////////////////////////////////////////////////////////
+// nsCoreUtils
+////////////////////////////////////////////////////////////////////////////////
+
+bool nsCoreUtils::IsLabelWithControl(nsIContent* aContent) {
+  dom::HTMLLabelElement* label = dom::HTMLLabelElement::FromNode(aContent);
+  if (label && label->GetControl()) return true;
+
+  return false;
+}
+
+bool nsCoreUtils::HasClickListener(nsIContent* aContent) {
+  NS_ENSURE_TRUE(aContent, false);
+  EventListenerManager* listenerManager =
+      aContent->GetExistingListenerManager();
+
+  return listenerManager &&
+         (listenerManager->HasListenersFor(nsGkAtoms::onclick) ||
+          listenerManager->HasListenersFor(nsGkAtoms::onmousedown) ||
+          listenerManager->HasListenersFor(nsGkAtoms::onmouseup));
+}
+
+void nsCoreUtils::DispatchClickEvent(XULTreeElement* aTree, int32_t aRowIndex,
+                                     nsTreeColumn* aColumn,
+                                     const nsAString& aPseudoElt) {
+  RefPtr<dom::Element> tcElm = aTree->GetTreeBody();
+  if (!tcElm) return;
+
+  Document* document = tcElm->GetUncomposedDoc();
+  if (!document) return;
+
+  RefPtr<PresShell> presShell = document->GetPresShell();
+  if (!presShell) {
+    return;
+  }
+
+  // Ensure row is visible.
+  aTree->EnsureRowIsVisible(aRowIndex);
+
+  // Calculate x and y coordinates.
+  nsresult rv;
+  nsIntRect rect =
+      aTree->GetCoordsForCellItem(aRowIndex, aColumn, aPseudoElt, rv);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  RefPtr<DOMRect> treeBodyRect = tcElm->GetBoundingClientRect();
+  int32_t tcX = (int32_t)treeBodyRect->X();
+  int32_t tcY = (int32_t)treeBodyRect->Y();
+
+  // Dispatch mouse events.
+  AutoWeakFrame tcFrame = tcElm->GetPrimaryFrame();
+  nsIFrame* rootFrame = presShell->GetRootFrame();
+
+  nsPoint offset;
+  nsCOMPtr<nsIWidget> rootWidget =
+      rootFrame->GetView()->GetNearestWidget(&offset);
+
+  RefPtr<nsPresContext> presContext = presShell->GetPresContext();
+
+  int32_t cnvdX = presContext->CSSPixelsToDevPixels(tcX + int32_t(rect.x) + 1) +
+                  presContext->AppUnitsToDevPixels(offset.x);
+  int32_t cnvdY = presContext->CSSPixelsToDevPixels(tcY + int32_t(rect.y) + 1) +
+                  presContext->AppUnitsToDevPixels(offset.y);
+
+  // XUL is just desktop, so there is no real reason for senfing touch events.
+  DispatchMouseEvent(eMouseDown, cnvdX, cnvdY, tcElm, tcFrame, presShell,
+                     rootWidget);
+
+  DispatchMouseEvent(eMouseUp, cnvdX, cnvdY, tcElm, tcFrame, presShell,
+                     rootWidget);
+}
+
+void nsCoreUtils::DispatchMouseEvent(EventMessage aMessage, int32_t aX,
+                                     int32_t aY, nsIContent* aContent,
+                                     nsIFrame* aFrame, PresShell* aPresShell,
+                                     nsIWidget* aRootWidget) {
+  WidgetMouseEvent event(true, aMessage, aRootWidget, WidgetMouseEvent::eReal,
+                         WidgetMouseEvent::eNormal);
+
+  event.mRefPoint = LayoutDeviceIntPoint(aX, aY);
+
+  event.mClickCount = 1;
+  event.mButton = MouseButton::ePrimary;
+  event.mInputSource = dom::MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
+
+  nsEventStatus status = nsEventStatus_eIgnore;
+  aPresShell->HandleEventWithTarget(&event, aFrame, aContent, &status);
+}
+
+void nsCoreUtils::DispatchTouchEvent(EventMessage aMessage, int32_t aX,
+                                     int32_t aY, nsIContent* aContent,
+                                     nsIFrame* aFrame, PresShell* aPresShell,
+                                     nsIWidget* aRootWidget) {
+  nsIDocShell* docShell = nullptr;
+  if (aPresShell->GetDocument()) {
+    docShell = aPresShell->GetDocument()->GetDocShell();
+  }
+  if (!dom::TouchEvent::PrefEnabled(docShell)) {
+    return;
+  }
+
+  WidgetTouchEvent event(true, aMessage, aRootWidget);
+
+  // XXX: Touch has an identifier of -1 to hint that it is synthesized.
+  RefPtr<dom::Touch> t = new dom::Touch(-1, LayoutDeviceIntPoint(aX, aY),
+                                        LayoutDeviceIntPoint(1, 1), 0.0f, 1.0f);
+  t->SetTouchTarget(aContent);
+  event.mTouches.AppendElement(t);
+  nsEventStatus status = nsEventStatus_eIgnore;
+  aPresShell->HandleEventWithTarget(&event, aFrame, aContent, &status);
+}
+
+uint32_t nsCoreUtils::GetAccessKeyFor(nsIContent* aContent) {
+  // Accesskeys are registered by @accesskey attribute only. At first check
+  // whether it is presented on the given element to avoid the slow
+  // EventStateManager::GetRegisteredAccessKey() method.
+  if (!aContent->IsElement() || !aContent->AsElement()->HasAttr(
+                                    kNameSpaceID_None, nsGkAtoms::accesskey)) {
+    return 0;
+  }
+
+  nsPresContext* presContext = aContent->OwnerDoc()->GetPresContext();
+  if (!presContext) return 0;
+
+  EventStateManager* esm = presContext->EventStateManager();
+  if (!esm) return 0;
+
+  return esm->GetRegisteredAccessKey(aContent->AsElement());
+}
+
+nsIContent* nsCoreUtils::GetDOMElementFor(nsIContent* aContent) {
+  if (aContent->IsElement()) return aContent;
+
+  if (aContent->IsText()) return aContent->GetFlattenedTreeParent();
+
+  return nullptr;
+}
+
+nsINode* nsCoreUtils::GetDOMNodeFromDOMPoint(nsINode* aNode, uint32_t aOffset) {
+  if (aNode && aNode->IsElement()) {
+    uint32_t childCount = aNode->GetChildCount();
+    NS_ASSERTION(aOffset <= childCount, "Wrong offset of the DOM point!");
+
+    // The offset can be after last child of container node that means DOM point
+    // is placed immediately after the last child. In this case use the DOM node
+    // from the given DOM point is used as result node.
+    if (aOffset != childCount) return aNode->GetChildAt_Deprecated(aOffset);
+  }
+
+  return aNode;
+}
+
+bool nsCoreUtils::IsAncestorOf(nsINode* aPossibleAncestorNode,
+                               nsINode* aPossibleDescendantNode,
+                               nsINode* aRootNode) {
+  NS_ENSURE_TRUE(aPossibleAncestorNode && aPossibleDescendantNode, false);
+
+  nsINode* parentNode = aPossibleDescendantNode;
+  while ((parentNode = parentNode->GetParentNode()) &&
+         parentNode != aRootNode) {
+    if (parentNode == aPossibleAncestorNode) return true;
+  }
+
+  return false;
+}
+
+nsresult nsCoreUtils::ScrollSubstringTo(nsIFrame* aFrame, nsRange* aRange,
+                                        uint32_t aScrollType) {
+  ScrollAxis vertical, horizontal;
+  ConvertScrollTypeToPercents(aScrollType, &vertical, &horizontal);
+
+  return ScrollSubstringTo(aFrame, aRange, vertical, horizontal);
+}
+
+nsresult nsCoreUtils::ScrollSubstringTo(nsIFrame* aFrame, nsRange* aRange,
+                                        ScrollAxis aVertical,
+                                        ScrollAxis aHorizontal) {
+  if (!aFrame || !aRange) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsPresContext* presContext = aFrame->PresContext();
+
+  nsCOMPtr<nsISelectionController> selCon;
+  aFrame->GetSelectionController(presContext, getter_AddRefs(selCon));
+  NS_ENSURE_TRUE(selCon, NS_ERROR_FAILURE);
+
+  RefPtr<dom::Selection> selection =
+      selCon->GetSelection(nsISelectionController::SELECTION_ACCESSIBILITY);
+
+  selection->RemoveAllRanges(IgnoreErrors());
+  selection->AddRangeAndSelectFramesAndNotifyListeners(*aRange, IgnoreErrors());
+
+  selection->ScrollIntoView(nsISelectionController::SELECTION_ANCHOR_REGION,
+                            aVertical, aHorizontal,
+                            Selection::SCROLL_SYNCHRONOUS);
+
+  selection->CollapseToStart(IgnoreErrors());
+
+  return NS_OK;
+}
+
+void nsCoreUtils::ScrollFrameToPoint(nsIFrame* aScrollableFrame,
+                                     nsIFrame* aFrame,
+                                     const LayoutDeviceIntPoint& aPoint) {
+  nsIScrollableFrame* scrollableFrame = do_QueryFrame(aScrollableFrame);
+  if (!scrollableFrame) return;
+
+  nsPoint point = LayoutDeviceIntPoint::ToAppUnits(
+      aPoint, aFrame->PresContext()->AppUnitsPerDevPixel());
+  nsRect frameRect = aFrame->GetScreenRectInAppUnits();
+  nsPoint deltaPoint = point - frameRect.TopLeft();
+
+  nsPoint scrollPoint = scrollableFrame->GetScrollPosition();
+  scrollPoint -= deltaPoint;
+
+  scrollableFrame->ScrollTo(scrollPoint, ScrollMode::Instant);
+}
+
+void nsCoreUtils::ConvertScrollTypeToPercents(uint32_t aScrollType,
+                                              ScrollAxis* aVertical,
+                                              ScrollAxis* aHorizontal) {
+  WhereToScroll whereY, whereX;
+  WhenToScroll whenY, whenX;
+  switch (aScrollType) {
+    case nsIAccessibleScrollType::SCROLL_TYPE_TOP_LEFT:
+      whereY = WhereToScroll::Start;
+      whenY = WhenToScroll::Always;
+      whereX = WhereToScroll::Start;
+      whenX = WhenToScroll::Always;
+      break;
+    case nsIAccessibleScrollType::SCROLL_TYPE_BOTTOM_RIGHT:
+      whereY = WhereToScroll::End;
+      whenY = WhenToScroll::Always;
+      whereX = WhereToScroll::End;
+      whenX = WhenToScroll::Always;
+      break;
+    case nsIAccessibleScrollType::SCROLL_TYPE_TOP_EDGE:
+      whereY = WhereToScroll::Start;
+      whenY = WhenToScroll::Always;
+      whereX = WhereToScroll::Nearest;
+      whenX = WhenToScroll::IfNotFullyVisible;
+      break;
+    case nsIAccessibleScrollType::SCROLL_TYPE_BOTTOM_EDGE:
+      whereY = WhereToScroll::End;
+      whenY = WhenToScroll::Always;
+      whereX = WhereToScroll::Nearest;
+      whenX = WhenToScroll::IfNotFullyVisible;
+      break;
+    case nsIAccessibleScrollType::SCROLL_TYPE_LEFT_EDGE:
+      whereY = WhereToScroll::Nearest;
+      whenY = WhenToScroll::IfNotFullyVisible;
+      whereX = WhereToScroll::Start;
+      whenX = WhenToScroll::Always;
+      break;
+    case nsIAccessibleScrollType::SCROLL_TYPE_RIGHT_EDGE:
+      whereY = WhereToScroll::Nearest;
+      whenY = WhenToScroll::IfNotFullyVisible;
+      whereX = WhereToScroll::End;
+      whenX = WhenToScroll::Always;
+      break;
+    default:
+      whereY = WhereToScroll::Center;
+      whenY = WhenToScroll::IfNotFullyVisible;
+      whereX = WhereToScroll::Center;
+      whenX = WhenToScroll::IfNotFullyVisible;
+  }
+  *aVertical = ScrollAxis(whereY, whenY);
+  *aHorizontal = ScrollAxis(whereX, whenX);
+}
+
+already_AddRefed<nsIDocShell> nsCoreUtils::GetDocShellFor(nsINode* aNode) {
+  if (!aNode) return nullptr;
+
+  nsCOMPtr<nsIDocShell> docShell = aNode->OwnerDoc()->GetDocShell();
+  return docShell.forget();
+}
+
+bool nsCoreUtils::IsRootDocument(Document* aDocument) {
+  nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem = aDocument->GetDocShell();
+  NS_ASSERTION(docShellTreeItem, "No document shell for document!");
+
+  nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
+  docShellTreeItem->GetInProcessParent(getter_AddRefs(parentTreeItem));
+
+  return !parentTreeItem;
+}
+
+bool nsCoreUtils::IsTopLevelContentDocInProcess(Document* aDocumentNode) {
+  mozilla::dom::BrowsingContext* bc = aDocumentNode->GetBrowsingContext();
+  return bc->IsContent() && (
+                                // Tab document.
+                                bc->IsTop() ||
+                                // Out-of-process iframe.
+                                !bc->GetParent()->IsInProcess());
+}
+
+bool nsCoreUtils::IsErrorPage(Document* aDocument) {
+  nsIURI* uri = aDocument->GetDocumentURI();
+  if (!uri->SchemeIs("about")) {
+    return false;
+  }
+
+  nsAutoCString path;
+  uri->GetPathQueryRef(path);
+
+  constexpr auto neterror = "neterror"_ns;
+  constexpr auto certerror = "certerror"_ns;
+
+  return StringBeginsWith(path, neterror) || StringBeginsWith(path, certerror);
+}
+
+PresShell* nsCoreUtils::GetPresShellFor(nsINode* aNode) {
+  return aNode->OwnerDoc()->GetPresShell();
+}
+
+bool nsCoreUtils::GetID(nsIContent* aContent, nsAString& aID) {
+  return aContent->IsElement() &&
+         aContent->AsElement()->GetAttr(nsGkAtoms::id, aID);
+}
+
+bool nsCoreUtils::GetUIntAttr(nsIContent* aContent, nsAtom* aAttr,
+                              int32_t* aUInt) {
+  if (!aContent->IsElement()) {
+    return false;
+  }
+  return GetUIntAttrValue(nsAccUtils::GetARIAAttr(aContent->AsElement(), aAttr),
+                          aUInt);
+}
+
+bool nsCoreUtils::GetUIntAttrValue(const nsAttrValue* aVal, int32_t* aUInt) {
+  if (!aVal) {
+    return false;
+  }
+  nsAutoString value;
+  aVal->ToString(value);
+  if (!value.IsEmpty()) {
+    nsresult error = NS_OK;
+    int32_t integer = value.ToInteger(&error);
+    if (NS_SUCCEEDED(error) && integer > 0) {
+      *aUInt = integer;
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void nsCoreUtils::GetLanguageFor(nsIContent* aContent, nsIContent* aRootContent,
+                                 nsAString& aLanguage) {
+  aLanguage.Truncate();
+
+  nsIContent* walkUp = aContent;
+  while (walkUp && walkUp != aRootContent &&
+         (!walkUp->IsElement() ||
+          !walkUp->AsElement()->GetAttr(nsGkAtoms::lang, aLanguage))) {
+    walkUp = walkUp->GetParent();
+  }
+}
+
+XULTreeElement* nsCoreUtils::GetTree(nsIContent* aContent) {
+  // Find DOMNode's parents recursively until reach the <tree> tag
+  nsIContent* currentContent = aContent;
+  while (currentContent) {
+    if (currentContent->NodeInfo()->Equals(nsGkAtoms::tree, kNameSpaceID_XUL)) {
+      return XULTreeElement::FromNode(currentContent);
+    }
+    currentContent = currentContent->GetFlattenedTreeParent();
+  }
+
+  return nullptr;
+}
+
+already_AddRefed<nsTreeColumn> nsCoreUtils::GetFirstSensibleColumn(
+    XULTreeElement* aTree, FlushType aFlushType) {
+  if (!aTree) {
+    return nullptr;
+  }
+
+  RefPtr<nsTreeColumns> cols = aTree->GetColumns(aFlushType);
+  if (!cols) {
+    return nullptr;
+  }
+
+  RefPtr<nsTreeColumn> column = cols->GetFirstColumn();
+  if (column && IsColumnHidden(column)) return GetNextSensibleColumn(column);
+
+  return column.forget();
+}
+
+uint32_t nsCoreUtils::GetSensibleColumnCount(XULTreeElement* aTree) {
+  uint32_t count = 0;
+  if (!aTree) {
+    return count;
+  }
+
+  RefPtr<nsTreeColumns> cols = aTree->GetColumns();
+  if (!cols) {
+    return count;
+  }
+
+  nsTreeColumn* column = cols->GetFirstColumn();
+
+  while (column) {
+    if (!IsColumnHidden(column)) count++;
+
+    column = column->GetNext();
+  }
+
+  return count;
+}
+
+already_AddRefed<nsTreeColumn> nsCoreUtils::GetSensibleColumnAt(
+    XULTreeElement* aTree, uint32_t aIndex) {
+  if (!aTree) {
+    return nullptr;
+  }
+
+  uint32_t idx = aIndex;
+
+  nsCOMPtr<nsTreeColumn> column = GetFirstSensibleColumn(aTree);
+  while (column) {
+    if (idx == 0) return column.forget();
+
+    idx--;
+    column = GetNextSensibleColumn(column);
+  }
+
+  return nullptr;
+}
+
+already_AddRefed<nsTreeColumn> nsCoreUtils::GetNextSensibleColumn(
+    nsTreeColumn* aColumn) {
+  if (!aColumn) {
+    return nullptr;
+  }
+
+  RefPtr<nsTreeColumn> nextColumn = aColumn->GetNext();
+
+  while (nextColumn && IsColumnHidden(nextColumn)) {
+    nextColumn = nextColumn->GetNext();
+  }
+
+  return nextColumn.forget();
+}
+
+already_AddRefed<nsTreeColumn> nsCoreUtils::GetPreviousSensibleColumn(
+    nsTreeColumn* aColumn) {
+  if (!aColumn) {
+    return nullptr;
+  }
+
+  RefPtr<nsTreeColumn> prevColumn = aColumn->GetPrevious();
+
+  while (prevColumn && IsColumnHidden(prevColumn)) {
+    prevColumn = prevColumn->GetPrevious();
+  }
+
+  return prevColumn.forget();
+}
+
+bool nsCoreUtils::IsColumnHidden(nsTreeColumn* aColumn) {
+  if (!aColumn) {
+    return false;
+  }
+
+  Element* element = aColumn->Element();
+  return element->AttrValueIs(kNameSpaceID_None, nsGkAtoms::hidden,
+                              nsGkAtoms::_true, eCaseMatters);
+}
+
+void nsCoreUtils::ScrollTo(PresShell* aPresShell, nsIContent* aContent,
+                           uint32_t aScrollType) {
+  ScrollAxis vertical, horizontal;
+  ConvertScrollTypeToPercents(aScrollType, &vertical, &horizontal);
+  aPresShell->ScrollContentIntoView(aContent, vertical, horizontal,
+                                    ScrollFlags::ScrollOverflowHidden);
+}
+
+bool nsCoreUtils::IsHTMLTableHeader(nsIContent* aContent) {
+  return aContent->NodeInfo()->Equals(nsGkAtoms::th) ||
+         (aContent->IsElement() &&
+          aContent->AsElement()->HasAttr(nsGkAtoms::scope));
+}
+
+bool nsCoreUtils::IsWhitespaceString(const nsAString& aString) {
+  nsAString::const_char_iterator iterBegin, iterEnd;
+
+  aString.BeginReading(iterBegin);
+  aString.EndReading(iterEnd);
+
+  while (iterBegin != iterEnd && IsWhitespace(*iterBegin)) ++iterBegin;
+
+  return iterBegin == iterEnd;
+}
+
+bool nsCoreUtils::AccEventObserversExist() {
+  nsCOMPtr<nsIObserverService> obsService = services::GetObserverService();
+  NS_ENSURE_TRUE(obsService, false);
+
+  nsCOMPtr<nsISimpleEnumerator> observers;
+  obsService->EnumerateObservers(NS_ACCESSIBLE_EVENT_TOPIC,
+                                 getter_AddRefs(observers));
+  NS_ENSURE_TRUE(observers, false);
+
+  bool hasObservers = false;
+  observers->HasMoreElements(&hasObservers);
+
+  return hasObservers;
+}
+
+void nsCoreUtils::DispatchAccEvent(RefPtr<nsIAccessibleEvent> event) {
+  nsCOMPtr<nsIObserverService> obsService = services::GetObserverService();
+  NS_ENSURE_TRUE_VOID(obsService);
+
+  obsService->NotifyObservers(event, NS_ACCESSIBLE_EVENT_TOPIC, nullptr);
+}
+
+bool nsCoreUtils::IsDisplayContents(nsIContent* aContent) {
+  auto* element = Element::FromNodeOrNull(aContent);
+  return element && element->IsDisplayContents();
+}
+
+bool nsCoreUtils::CanCreateAccessibleWithoutFrame(nsIContent* aContent) {
+  auto* element = Element::FromNodeOrNull(aContent);
+  if (!element) {
+    return false;
+  }
+  if (!element->HasServoData() || Servo_Element_IsDisplayNone(element)) {
+    // Out of the flat tree or in a display: none subtree.
+    return false;
+  }
+
+  // If we aren't display: contents or option/optgroup we can't create an
+  // accessible without frame. Our select combobox code relies on the latter.
+  if (!element->IsDisplayContents() &&
+      !element->IsAnyOfHTMLElements(nsGkAtoms::option, nsGkAtoms::optgroup)) {
+    return false;
+  }
+
+  // Even if we're display: contents or optgroups, we might not be able to
+  // create an accessible if we're in a content-visibility: hidden subtree.
+  //
+  // To check that, find the closest ancestor element with a frame.
+  for (nsINode* ancestor = element->GetFlattenedTreeParentNode();
+       ancestor && ancestor->IsContent();
+       ancestor = ancestor->GetFlattenedTreeParentNode()) {
+    if (nsIFrame* f = ancestor->AsContent()->GetPrimaryFrame()) {
+      if (f->HidesContent(nsIFrame::IncludeContentVisibility::Hidden) ||
+          f->IsHiddenByContentVisibilityOnAnyAncestor(
+              nsIFrame::IncludeContentVisibility::Hidden)) {
+        return false;
+      }
+      break;
+    }
+  }
+
+  return true;
+}
+
+bool nsCoreUtils::IsDocumentVisibleConsideringInProcessAncestors(
+    const Document* aDocument) {
+  const Document* parent = aDocument;
+  do {
+    if (!parent->IsVisible()) {
+      return false;
+    }
+  } while ((parent = parent->GetInProcessParentDocument()));
+  return true;
+}