Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1205 insertions, 0 deletions

diff --git a/accessible/generic/HyperTextAccessible.cpp b/accessible/generic/HyperTextAccessible.cpp
new file mode 100644
index 0000000000..943ac63c1c
--- /dev/null
+++ b/accessible/generic/HyperTextAccessible.cpp
@@ -0,0 +1,1205 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et tw=78: */
+/* 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 "HyperTextAccessible-inl.h"
+
+#include "nsAccessibilityService.h"
+#include "nsAccessiblePivot.h"
+#include "nsIAccessibleTypes.h"
+#include "AccAttributes.h"
+#include "DocAccessible.h"
+#include "HTMLListAccessible.h"
+#include "LocalAccessible-inl.h"
+#include "Pivot.h"
+#include "Relation.h"
+#include "Role.h"
+#include "States.h"
+#include "TextAttrs.h"
+#include "TextLeafRange.h"
+#include "TextRange.h"
+#include "TreeWalker.h"
+
+#include "nsCaret.h"
+#include "nsContentUtils.h"
+#include "nsDebug.h"
+#include "nsFocusManager.h"
+#include "nsIEditingSession.h"
+#include "nsContainerFrame.h"
+#include "nsFrameSelection.h"
+#include "nsILineIterator.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIScrollableFrame.h"
+#include "nsIMathMLFrame.h"
+#include "nsLayoutUtils.h"
+#include "nsRange.h"
+#include "nsTextFragment.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/BinarySearch.h"
+#include "mozilla/EditorBase.h"
+#include "mozilla/HTMLEditor.h"
+#include "mozilla/IntegerRange.h"
+#include "mozilla/MathAlgorithms.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLBRElement.h"
+#include "mozilla/dom/HTMLHeadingElement.h"
+#include "mozilla/dom/Selection.h"
+#include "gfxSkipChars.h"
+#include <algorithm>
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// HyperTextAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+HyperTextAccessible::HyperTextAccessible(nsIContent* aNode, DocAccessible* aDoc)
+    : AccessibleWrap(aNode, aDoc) {
+  mType = eHyperTextType;
+  mGenericTypes |= eHyperText;
+}
+
+role HyperTextAccessible::NativeRole() const {
+  a11y::role r = GetAccService()->MarkupRole(mContent);
+  if (r != roles::NOTHING) return r;
+
+  nsIFrame* frame = GetFrame();
+  if (frame && frame->IsInlineFrame()) return roles::TEXT;
+
+  return roles::TEXT_CONTAINER;
+}
+
+uint64_t HyperTextAccessible::NativeState() const {
+  uint64_t states = AccessibleWrap::NativeState();
+
+  if (IsEditable()) {
+    states |= states::EDITABLE;
+
+  } else if (mContent->IsHTMLElement(nsGkAtoms::article)) {
+    // We want <article> to behave like a document in terms of readonly state.
+    states |= states::READONLY;
+  }
+
+  nsIFrame* frame = GetFrame();
+  if ((states & states::EDITABLE) || (frame && frame->IsSelectable(nullptr))) {
+    // If the accessible is editable the layout selectable state only disables
+    // mouse selection, but keyboard (shift+arrow) selection is still possible.
+    states |= states::SELECTABLE_TEXT;
+  }
+
+  return states;
+}
+
+bool HyperTextAccessible::IsEditable() const {
+  if (!mContent) {
+    return false;
+  }
+  return mContent->AsElement()->State().HasState(dom::ElementState::READWRITE);
+}
+
+uint32_t HyperTextAccessible::DOMPointToOffset(nsINode* aNode,
+                                               int32_t aNodeOffset,
+                                               bool aIsEndOffset) const {
+  if (!aNode) return 0;
+
+  uint32_t offset = 0;
+  nsINode* findNode = nullptr;
+
+  if (aNodeOffset == -1) {
+    findNode = aNode;
+
+  } else if (aNode->IsText()) {
+    // For text nodes, aNodeOffset comes in as a character offset
+    // Text offset will be added at the end, if we find the offset in this
+    // hypertext We want the "skipped" offset into the text (rendered text
+    // without the extra whitespace)
+    nsIFrame* frame = aNode->AsContent()->GetPrimaryFrame();
+    NS_ENSURE_TRUE(frame, 0);
+
+    nsresult rv = ContentToRenderedOffset(frame, aNodeOffset, &offset);
+    NS_ENSURE_SUCCESS(rv, 0);
+
+    findNode = aNode;
+
+  } else {
+    // findNode could be null if aNodeOffset == # of child nodes, which means
+    // one of two things:
+    // 1) there are no children, and the passed-in node is not mContent -- use
+    //    parentContent for the node to find
+    // 2) there are no children and the passed-in node is mContent, which means
+    //    we're an empty nsIAccessibleText
+    // 3) there are children and we're at the end of the children
+
+    findNode = aNode->GetChildAt_Deprecated(aNodeOffset);
+    if (!findNode) {
+      if (aNodeOffset == 0) {
+        if (aNode == GetNode()) {
+          // Case #1: this accessible has no children and thus has empty text,
+          // we can only be at hypertext offset 0.
+          return 0;
+        }
+
+        // Case #2: there are no children, we're at this node.
+        findNode = aNode;
+      } else if (aNodeOffset == static_cast<int32_t>(aNode->GetChildCount())) {
+        // Case #3: we're after the last child, get next node to this one.
+        for (nsINode* tmpNode = aNode;
+             !findNode && tmpNode && tmpNode != mContent;
+             tmpNode = tmpNode->GetParent()) {
+          findNode = tmpNode->GetNextSibling();
+        }
+      }
+    }
+  }
+
+  // Get accessible for this findNode, or if that node isn't accessible, use the
+  // accessible for the next DOM node which has one (based on forward depth
+  // first search)
+  LocalAccessible* descendant = nullptr;
+  if (findNode) {
+    dom::HTMLBRElement* brElement = dom::HTMLBRElement::FromNode(findNode);
+    if (brElement && brElement->IsPaddingForEmptyEditor()) {
+      // This <br> is the hacky "padding <br> element" used when there is no
+      // text in the editor.
+      return 0;
+    }
+
+    descendant = mDoc->GetAccessible(findNode);
+    if (!descendant && findNode->IsContent()) {
+      LocalAccessible* container = mDoc->GetContainerAccessible(findNode);
+      if (container) {
+        TreeWalker walker(container, findNode->AsContent(),
+                          TreeWalker::eWalkContextTree);
+        descendant = walker.Next();
+        if (!descendant) descendant = container;
+      }
+    }
+  }
+
+  return TransformOffset(descendant, offset, aIsEndOffset);
+}
+
+uint32_t HyperTextAccessible::TransformOffset(LocalAccessible* aDescendant,
+                                              uint32_t aOffset,
+                                              bool aIsEndOffset) const {
+  // From the descendant, go up and get the immediate child of this hypertext.
+  uint32_t offset = aOffset;
+  LocalAccessible* descendant = aDescendant;
+  while (descendant) {
+    LocalAccessible* parent = descendant->LocalParent();
+    if (parent == this) return GetChildOffset(descendant) + offset;
+
+    // This offset no longer applies because the passed-in text object is not
+    // a child of the hypertext. This happens when there are nested hypertexts,
+    // e.g. <div>abc<h1>def</h1>ghi</div>. Thus we need to adjust the offset
+    // to make it relative the hypertext.
+    // If the end offset is not supposed to be inclusive and the original point
+    // is not at 0 offset then the returned offset should be after an embedded
+    // character the original point belongs to.
+    if (aIsEndOffset) {
+      // Similar to our special casing in FindOffset, we add handling for
+      // bulleted lists here because PeekOffset returns the inner text node
+      // for a list when it should return the list bullet.
+      // We manually set the offset so the error doesn't propagate up.
+      if (offset == 0 && parent && parent->IsHTMLListItem() &&
+          descendant->LocalPrevSibling() &&
+          descendant->LocalPrevSibling() ==
+              parent->AsHTMLListItem()->Bullet()) {
+        offset = 0;
+      } else {
+        offset = (offset > 0 || descendant->IndexInParent() > 0) ? 1 : 0;
+      }
+    } else {
+      offset = 0;
+    }
+
+    descendant = parent;
+  }
+
+  // If the given a11y point cannot be mapped into offset relative this
+  // hypertext offset then return length as fallback value.
+  return CharacterCount();
+}
+
+DOMPoint HyperTextAccessible::OffsetToDOMPoint(int32_t aOffset) const {
+  // 0 offset is valid even if no children. In this case the associated editor
+  // is empty so return a DOM point for editor root element.
+  if (aOffset == 0) {
+    RefPtr<EditorBase> editorBase = GetEditor();
+    if (editorBase) {
+      if (editorBase->IsEmpty()) {
+        return DOMPoint(editorBase->GetRoot(), 0);
+      }
+    }
+  }
+
+  int32_t childIdx = GetChildIndexAtOffset(aOffset);
+  if (childIdx == -1) return DOMPoint();
+
+  LocalAccessible* child = LocalChildAt(childIdx);
+  int32_t innerOffset = aOffset - GetChildOffset(childIdx);
+
+  // A text leaf case.
+  if (child->IsTextLeaf()) {
+    // The point is inside the text node. This is always true for any text leaf
+    // except a last child one. See assertion below.
+    if (aOffset < GetChildOffset(childIdx + 1)) {
+      nsIContent* content = child->GetContent();
+      int32_t idx = 0;
+      if (NS_FAILED(RenderedToContentOffset(content->GetPrimaryFrame(),
+                                            innerOffset, &idx))) {
+        return DOMPoint();
+      }
+
+      return DOMPoint(content, idx);
+    }
+
+    // Set the DOM point right after the text node.
+    MOZ_ASSERT(static_cast<uint32_t>(aOffset) == CharacterCount());
+    innerOffset = 1;
+  }
+
+  // Case of embedded object. The point is either before or after the element.
+  NS_ASSERTION(innerOffset == 0 || innerOffset == 1, "A wrong inner offset!");
+  nsINode* node = child->GetNode();
+  nsINode* parentNode = node->GetParentNode();
+  return parentNode ? DOMPoint(parentNode,
+                               parentNode->ComputeIndexOf_Deprecated(node) +
+                                   innerOffset)
+                    : DOMPoint();
+}
+
+already_AddRefed<AccAttributes> HyperTextAccessible::DefaultTextAttributes() {
+  RefPtr<AccAttributes> attributes = new AccAttributes();
+
+  TextAttrsMgr textAttrsMgr(this);
+  textAttrsMgr.GetAttributes(attributes);
+  return attributes.forget();
+}
+
+void HyperTextAccessible::SetMathMLXMLRoles(AccAttributes* aAttributes) {
+  // Add MathML xmlroles based on the position inside the parent.
+  LocalAccessible* parent = LocalParent();
+  if (parent) {
+    switch (parent->Role()) {
+      case roles::MATHML_CELL:
+      case roles::MATHML_ENCLOSED:
+      case roles::MATHML_ERROR:
+      case roles::MATHML_MATH:
+      case roles::MATHML_ROW:
+      case roles::MATHML_SQUARE_ROOT:
+      case roles::MATHML_STYLE:
+        if (Role() == roles::MATHML_OPERATOR) {
+          // This is an operator inside an <mrow> (or an inferred <mrow>).
+          // See http://www.w3.org/TR/MathML3/chapter3.html#presm.inferredmrow
+          // XXX We should probably do something similar for MATHML_FENCED, but
+          // operators do not appear in the accessible tree. See bug 1175747.
+          nsIMathMLFrame* mathMLFrame = do_QueryFrame(GetFrame());
+          if (mathMLFrame) {
+            nsEmbellishData embellishData;
+            mathMLFrame->GetEmbellishData(embellishData);
+            if (NS_MATHML_EMBELLISH_IS_FENCE(embellishData.flags)) {
+              if (!LocalPrevSibling()) {
+                aAttributes->SetAttribute(nsGkAtoms::xmlroles,
+                                          nsGkAtoms::open_fence);
+              } else if (!LocalNextSibling()) {
+                aAttributes->SetAttribute(nsGkAtoms::xmlroles,
+                                          nsGkAtoms::close_fence);
+              }
+            }
+            if (NS_MATHML_EMBELLISH_IS_SEPARATOR(embellishData.flags)) {
+              aAttributes->SetAttribute(nsGkAtoms::xmlroles,
+                                        nsGkAtoms::separator_);
+            }
+          }
+        }
+        break;
+      case roles::MATHML_FRACTION:
+        aAttributes->SetAttribute(
+            nsGkAtoms::xmlroles, IndexInParent() == 0 ? nsGkAtoms::numerator
+                                                      : nsGkAtoms::denominator);
+        break;
+      case roles::MATHML_ROOT:
+        aAttributes->SetAttribute(
+            nsGkAtoms::xmlroles,
+            IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::root_index);
+        break;
+      case roles::MATHML_SUB:
+        aAttributes->SetAttribute(
+            nsGkAtoms::xmlroles,
+            IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::subscript);
+        break;
+      case roles::MATHML_SUP:
+        aAttributes->SetAttribute(
+            nsGkAtoms::xmlroles,
+            IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::superscript);
+        break;
+      case roles::MATHML_SUB_SUP: {
+        int32_t index = IndexInParent();
+        aAttributes->SetAttribute(
+            nsGkAtoms::xmlroles,
+            index == 0
+                ? nsGkAtoms::base
+                : (index == 1 ? nsGkAtoms::subscript : nsGkAtoms::superscript));
+      } break;
+      case roles::MATHML_UNDER:
+        aAttributes->SetAttribute(
+            nsGkAtoms::xmlroles,
+            IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::underscript);
+        break;
+      case roles::MATHML_OVER:
+        aAttributes->SetAttribute(
+            nsGkAtoms::xmlroles,
+            IndexInParent() == 0 ? nsGkAtoms::base : nsGkAtoms::overscript);
+        break;
+      case roles::MATHML_UNDER_OVER: {
+        int32_t index = IndexInParent();
+        aAttributes->SetAttribute(nsGkAtoms::xmlroles,
+                                  index == 0
+                                      ? nsGkAtoms::base
+                                      : (index == 1 ? nsGkAtoms::underscript
+                                                    : nsGkAtoms::overscript));
+      } break;
+      case roles::MATHML_MULTISCRIPTS: {
+        // Get the <multiscripts> base.
+        nsIContent* child;
+        bool baseFound = false;
+        for (child = parent->GetContent()->GetFirstChild(); child;
+             child = child->GetNextSibling()) {
+          if (child->IsMathMLElement()) {
+            baseFound = true;
+            break;
+          }
+        }
+        if (baseFound) {
+          nsIContent* content = GetContent();
+          if (child == content) {
+            // We are the base.
+            aAttributes->SetAttribute(nsGkAtoms::xmlroles, nsGkAtoms::base);
+          } else {
+            // Browse the list of scripts to find us and determine our type.
+            bool postscript = true;
+            bool subscript = true;
+            for (child = child->GetNextSibling(); child;
+                 child = child->GetNextSibling()) {
+              if (!child->IsMathMLElement()) continue;
+              if (child->IsMathMLElement(nsGkAtoms::mprescripts_)) {
+                postscript = false;
+                subscript = true;
+                continue;
+              }
+              if (child == content) {
+                if (postscript) {
+                  aAttributes->SetAttribute(nsGkAtoms::xmlroles,
+                                            subscript ? nsGkAtoms::subscript
+                                                      : nsGkAtoms::superscript);
+                } else {
+                  aAttributes->SetAttribute(nsGkAtoms::xmlroles,
+                                            subscript
+                                                ? nsGkAtoms::presubscript
+                                                : nsGkAtoms::presuperscript);
+                }
+                break;
+              }
+              subscript = !subscript;
+            }
+          }
+        }
+      } break;
+      default:
+        break;
+    }
+  }
+}
+
+already_AddRefed<AccAttributes> HyperTextAccessible::NativeAttributes() {
+  RefPtr<AccAttributes> attributes = AccessibleWrap::NativeAttributes();
+
+  // 'formatting' attribute is deprecated, 'display' attribute should be
+  // instead.
+  nsIFrame* frame = GetFrame();
+  if (frame && frame->IsBlockFrame()) {
+    attributes->SetAttribute(nsGkAtoms::formatting, nsGkAtoms::block);
+  }
+
+  if (FocusMgr()->IsFocused(this)) {
+    int32_t lineNumber = CaretLineNumber();
+    if (lineNumber >= 1) {
+      attributes->SetAttribute(nsGkAtoms::lineNumber, lineNumber);
+    }
+  }
+
+  if (HasOwnContent()) {
+    GetAccService()->MarkupAttributes(this, attributes);
+    if (mContent->IsMathMLElement()) SetMathMLXMLRoles(attributes);
+  }
+
+  return attributes.forget();
+}
+
+int32_t HyperTextAccessible::OffsetAtPoint(int32_t aX, int32_t aY,
+                                           uint32_t aCoordType) {
+  nsIFrame* hyperFrame = GetFrame();
+  if (!hyperFrame) return -1;
+
+  LayoutDeviceIntPoint coords =
+      nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordType, this);
+
+  nsPresContext* presContext = mDoc->PresContext();
+  nsPoint coordsInAppUnits = LayoutDeviceIntPoint::ToAppUnits(
+      coords, presContext->AppUnitsPerDevPixel());
+
+  nsRect frameScreenRect = hyperFrame->GetScreenRectInAppUnits();
+  if (!frameScreenRect.Contains(coordsInAppUnits.x, coordsInAppUnits.y)) {
+    return -1;  // Not found
+  }
+
+  nsPoint pointInHyperText(coordsInAppUnits.x - frameScreenRect.X(),
+                           coordsInAppUnits.y - frameScreenRect.Y());
+
+  // Go through the frames to check if each one has the point.
+  // When one does, add up the character offsets until we have a match
+
+  // We have an point in an accessible child of this, now we need to add up the
+  // offsets before it to what we already have
+  int32_t offset = 0;
+  uint32_t childCount = ChildCount();
+  for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
+    LocalAccessible* childAcc = mChildren[childIdx];
+
+    nsIFrame* primaryFrame = childAcc->GetFrame();
+    NS_ENSURE_TRUE(primaryFrame, -1);
+
+    nsIFrame* frame = primaryFrame;
+    while (frame) {
+      nsIContent* content = frame->GetContent();
+      NS_ENSURE_TRUE(content, -1);
+      nsPoint pointInFrame = pointInHyperText - frame->GetOffsetTo(hyperFrame);
+      nsSize frameSize = frame->GetSize();
+      if (pointInFrame.x < frameSize.width &&
+          pointInFrame.y < frameSize.height) {
+        // Finished
+        if (frame->IsTextFrame()) {
+          nsIFrame::ContentOffsets contentOffsets =
+              frame->GetContentOffsetsFromPointExternal(
+                  pointInFrame, nsIFrame::IGNORE_SELECTION_STYLE);
+          if (contentOffsets.IsNull() || contentOffsets.content != content) {
+            return -1;  // Not found
+          }
+          uint32_t addToOffset;
+          nsresult rv = ContentToRenderedOffset(
+              primaryFrame, contentOffsets.offset, &addToOffset);
+          NS_ENSURE_SUCCESS(rv, -1);
+          offset += addToOffset;
+        }
+        return offset;
+      }
+      frame = frame->GetNextContinuation();
+    }
+
+    offset += nsAccUtils::TextLength(childAcc);
+  }
+
+  return -1;  // Not found
+}
+
+already_AddRefed<EditorBase> HyperTextAccessible::GetEditor() const {
+  if (!mContent->HasFlag(NODE_IS_EDITABLE)) {
+    // If we're inside an editable container, then return that container's
+    // editor
+    LocalAccessible* ancestor = LocalParent();
+    while (ancestor) {
+      HyperTextAccessible* hyperText = ancestor->AsHyperText();
+      if (hyperText) {
+        // Recursion will stop at container doc because it has its own impl
+        // of GetEditor()
+        return hyperText->GetEditor();
+      }
+
+      ancestor = ancestor->LocalParent();
+    }
+
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(mContent);
+  nsCOMPtr<nsIEditingSession> editingSession;
+  docShell->GetEditingSession(getter_AddRefs(editingSession));
+  if (!editingSession) return nullptr;  // No editing session interface
+
+  dom::Document* docNode = mDoc->DocumentNode();
+  RefPtr<HTMLEditor> htmlEditor =
+      editingSession->GetHTMLEditorForWindow(docNode->GetWindow());
+  return htmlEditor.forget();
+}
+
+/**
+ * =================== Caret & Selection ======================
+ */
+
+nsresult HyperTextAccessible::SetSelectionRange(int32_t aStartPos,
+                                                int32_t aEndPos) {
+  // Before setting the selection range, we need to ensure that the editor
+  // is initialized. (See bug 804927.)
+  // Otherwise, it's possible that lazy editor initialization will override
+  // the selection we set here and leave the caret at the end of the text.
+  // By calling GetEditor here, we ensure that editor initialization is
+  // completed before we set the selection.
+  RefPtr<EditorBase> editorBase = GetEditor();
+
+  bool isFocusable = InteractiveState() & states::FOCUSABLE;
+
+  // If accessible is focusable then focus it before setting the selection to
+  // neglect control's selection changes on focus if any (for example, inputs
+  // that do select all on focus).
+  // some input controls
+  if (isFocusable) TakeFocus();
+
+  RefPtr<dom::Selection> domSel = DOMSelection();
+  NS_ENSURE_STATE(domSel);
+
+  // Set up the selection.
+  for (const uint32_t idx : Reversed(IntegerRange(1u, domSel->RangeCount()))) {
+    MOZ_ASSERT(domSel->RangeCount() == idx + 1);
+    RefPtr<nsRange> range{domSel->GetRangeAt(idx)};
+    if (!range) {
+      break;  // The range count has been changed by somebody else.
+    }
+    domSel->RemoveRangeAndUnselectFramesAndNotifyListeners(*range,
+                                                           IgnoreErrors());
+  }
+  SetSelectionBoundsAt(0, aStartPos, aEndPos);
+
+  // Make sure it is visible
+  domSel->ScrollIntoView(nsISelectionController::SELECTION_FOCUS_REGION,
+                         ScrollAxis(), ScrollAxis(),
+                         dom::Selection::SCROLL_FOR_CARET_MOVE |
+                             dom::Selection::SCROLL_OVERFLOW_HIDDEN);
+
+  // When selection is done, move the focus to the selection if accessible is
+  // not focusable. That happens when selection is set within hypertext
+  // accessible.
+  if (isFocusable) return NS_OK;
+
+  nsFocusManager* DOMFocusManager = nsFocusManager::GetFocusManager();
+  if (DOMFocusManager) {
+    NS_ENSURE_TRUE(mDoc, NS_ERROR_FAILURE);
+    dom::Document* docNode = mDoc->DocumentNode();
+    NS_ENSURE_TRUE(docNode, NS_ERROR_FAILURE);
+    nsCOMPtr<nsPIDOMWindowOuter> window = docNode->GetWindow();
+    RefPtr<dom::Element> result;
+    DOMFocusManager->MoveFocus(
+        window, nullptr, nsIFocusManager::MOVEFOCUS_CARET,
+        nsIFocusManager::FLAG_BYMOVEFOCUS, getter_AddRefs(result));
+  }
+
+  return NS_OK;
+}
+
+int32_t HyperTextAccessible::CaretOffset() const {
+  // Not focused focusable accessible except document accessible doesn't have
+  // a caret.
+  if (!IsDoc() && !FocusMgr()->IsFocused(this) &&
+      (InteractiveState() & states::FOCUSABLE)) {
+    return -1;
+  }
+
+  // Check cached value.
+  int32_t caretOffset = -1;
+  HyperTextAccessible* text = SelectionMgr()->AccessibleWithCaret(&caretOffset);
+
+  // Use cached value if it corresponds to this accessible.
+  if (caretOffset != -1) {
+    if (text == this) return caretOffset;
+
+    nsINode* textNode = text->GetNode();
+    // Ignore offset if cached accessible isn't a text leaf.
+    if (nsCoreUtils::IsAncestorOf(GetNode(), textNode)) {
+      return TransformOffset(text, textNode->IsText() ? caretOffset : 0, false);
+    }
+  }
+
+  // No caret if the focused node is not inside this DOM node and this DOM node
+  // is not inside of focused node.
+  FocusManager::FocusDisposition focusDisp =
+      FocusMgr()->IsInOrContainsFocus(this);
+  if (focusDisp == FocusManager::eNone) return -1;
+
+  // Turn the focus node and offset of the selection into caret hypretext
+  // offset.
+  dom::Selection* domSel = DOMSelection();
+  NS_ENSURE_TRUE(domSel, -1);
+
+  nsINode* focusNode = domSel->GetFocusNode();
+  uint32_t focusOffset = domSel->FocusOffset();
+
+  // No caret if this DOM node is inside of focused node but the selection's
+  // focus point is not inside of this DOM node.
+  if (focusDisp == FocusManager::eContainedByFocus) {
+    nsINode* resultNode =
+        nsCoreUtils::GetDOMNodeFromDOMPoint(focusNode, focusOffset);
+
+    nsINode* thisNode = GetNode();
+    if (resultNode != thisNode &&
+        !nsCoreUtils::IsAncestorOf(thisNode, resultNode)) {
+      return -1;
+    }
+  }
+
+  return DOMPointToOffset(focusNode, focusOffset);
+}
+
+int32_t HyperTextAccessible::CaretLineNumber() {
+  // Provide the line number for the caret, relative to the
+  // currently focused node. Use a 1-based index
+  RefPtr<nsFrameSelection> frameSelection = FrameSelection();
+  if (!frameSelection) return -1;
+
+  dom::Selection* domSel = frameSelection->GetSelection(SelectionType::eNormal);
+  if (!domSel) return -1;
+
+  nsINode* caretNode = domSel->GetFocusNode();
+  if (!caretNode || !caretNode->IsContent()) return -1;
+
+  nsIContent* caretContent = caretNode->AsContent();
+  if (!nsCoreUtils::IsAncestorOf(GetNode(), caretContent)) return -1;
+
+  int32_t returnOffsetUnused;
+  uint32_t caretOffset = domSel->FocusOffset();
+  CaretAssociationHint hint = frameSelection->GetHint();
+  nsIFrame* caretFrame = frameSelection->GetFrameForNodeOffset(
+      caretContent, caretOffset, hint, &returnOffsetUnused);
+  NS_ENSURE_TRUE(caretFrame, -1);
+
+  AutoAssertNoDomMutations guard;  // The nsILineIterators below will break if
+                                   // the DOM is modified while they're in use!
+  int32_t lineNumber = 1;
+  nsILineIterator* lineIterForCaret = nullptr;
+  nsIContent* hyperTextContent = IsContent() ? mContent.get() : nullptr;
+  while (caretFrame) {
+    if (hyperTextContent == caretFrame->GetContent()) {
+      return lineNumber;  // Must be in a single line hyper text, there is no
+                          // line iterator
+    }
+    nsContainerFrame* parentFrame = caretFrame->GetParent();
+    if (!parentFrame) break;
+
+    // Add lines for the sibling frames before the caret
+    nsIFrame* sibling = parentFrame->PrincipalChildList().FirstChild();
+    while (sibling && sibling != caretFrame) {
+      nsILineIterator* lineIterForSibling = sibling->GetLineIterator();
+      if (lineIterForSibling) {
+        // For the frames before that grab all the lines
+        int32_t addLines = lineIterForSibling->GetNumLines();
+        lineNumber += addLines;
+      }
+      sibling = sibling->GetNextSibling();
+    }
+
+    // Get the line number relative to the container with lines
+    if (!lineIterForCaret) {  // Add the caret line just once
+      lineIterForCaret = parentFrame->GetLineIterator();
+      if (lineIterForCaret) {
+        // Ancestor of caret
+        int32_t addLines = lineIterForCaret->FindLineContaining(caretFrame);
+        lineNumber += addLines;
+      }
+    }
+
+    caretFrame = parentFrame;
+  }
+
+  MOZ_ASSERT_UNREACHABLE(
+      "DOM ancestry had this hypertext but frame ancestry didn't");
+  return lineNumber;
+}
+
+LayoutDeviceIntRect HyperTextAccessible::GetCaretRect(nsIWidget** aWidget) {
+  *aWidget = nullptr;
+
+  RefPtr<nsCaret> caret = mDoc->PresShellPtr()->GetCaret();
+  NS_ENSURE_TRUE(caret, LayoutDeviceIntRect());
+
+  bool isVisible = caret->IsVisible();
+  if (!isVisible) return LayoutDeviceIntRect();
+
+  nsRect rect;
+  nsIFrame* frame = caret->GetGeometry(&rect);
+  if (!frame || rect.IsEmpty()) return LayoutDeviceIntRect();
+
+  PresShell* presShell = mDoc->PresShellPtr();
+  // Transform rect to be relative to the root frame.
+  nsIFrame* rootFrame = presShell->GetRootFrame();
+  rect = nsLayoutUtils::TransformFrameRectToAncestor(frame, rect, rootFrame);
+  // We need to inverse translate with the offset of the edge of the visual
+  // viewport from top edge of the layout viewport.
+  nsPoint viewportOffset = presShell->GetVisualViewportOffset() -
+                           presShell->GetLayoutViewportOffset();
+  rect.MoveBy(-viewportOffset);
+  // We need to take into account a non-1 resolution set on the presshell.
+  // This happens with async pinch zooming. Here we scale the bounds before
+  // adding the screen-relative offset.
+  rect.ScaleRoundOut(presShell->GetResolution());
+  // Now we need to put the rect in absolute screen coords.
+  nsRect rootScreenRect = rootFrame->GetScreenRectInAppUnits();
+  rect.MoveBy(rootScreenRect.TopLeft());
+  // Finally, convert from app units.
+  auto caretRect = LayoutDeviceIntRect::FromAppUnitsToNearest(
+      rect, presShell->GetPresContext()->AppUnitsPerDevPixel());
+
+  // Correct for character size, so that caret always matches the size of
+  // the character. This is important for font size transitions, and is
+  // necessary because the Gecko caret uses the previous character's size as
+  // the user moves forward in the text by character.
+  int32_t caretOffset = CaretOffset();
+  if (NS_WARN_IF(caretOffset == -1)) {
+    // The caret offset will be -1 if this Accessible isn't focused. Note that
+    // the DOM node contaning the caret might be focused, but the Accessible
+    // might not be; e.g. due to an autocomplete popup suggestion having a11y
+    // focus.
+    return LayoutDeviceIntRect();
+  }
+  LayoutDeviceIntRect charRect = CharBounds(
+      caretOffset, nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE);
+  if (!charRect.IsEmpty()) {
+    caretRect.SetTopEdge(charRect.Y());
+  }
+
+  *aWidget = frame->GetNearestWidget();
+  return caretRect;
+}
+
+void HyperTextAccessible::GetSelectionDOMRanges(SelectionType aSelectionType,
+                                                nsTArray<nsRange*>* aRanges) {
+  // Ignore selection if it is not visible.
+  RefPtr<nsFrameSelection> frameSelection = FrameSelection();
+  if (!frameSelection || frameSelection->GetDisplaySelection() <=
+                             nsISelectionController::SELECTION_HIDDEN) {
+    return;
+  }
+
+  dom::Selection* domSel = frameSelection->GetSelection(aSelectionType);
+  if (!domSel) return;
+
+  nsINode* startNode = GetNode();
+
+  RefPtr<EditorBase> editorBase = GetEditor();
+  if (editorBase) {
+    startNode = editorBase->GetRoot();
+  }
+
+  if (!startNode) return;
+
+  uint32_t childCount = startNode->GetChildCount();
+  nsresult rv = domSel->GetDynamicRangesForIntervalArray(
+      startNode, 0, startNode, childCount, true, aRanges);
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  // Remove collapsed ranges
+  aRanges->RemoveElementsBy(
+      [](const auto& range) { return range->Collapsed(); });
+}
+
+int32_t HyperTextAccessible::SelectionCount() {
+  nsTArray<nsRange*> ranges;
+  GetSelectionDOMRanges(SelectionType::eNormal, &ranges);
+  return ranges.Length();
+}
+
+bool HyperTextAccessible::SelectionBoundsAt(int32_t aSelectionNum,
+                                            int32_t* aStartOffset,
+                                            int32_t* aEndOffset) {
+  *aStartOffset = *aEndOffset = 0;
+
+  nsTArray<nsRange*> ranges;
+  GetSelectionDOMRanges(SelectionType::eNormal, &ranges);
+
+  uint32_t rangeCount = ranges.Length();
+  if (aSelectionNum < 0 || aSelectionNum >= static_cast<int32_t>(rangeCount)) {
+    return false;
+  }
+
+  nsRange* range = ranges[aSelectionNum];
+
+  // Get start and end points.
+  nsINode* startNode = range->GetStartContainer();
+  nsINode* endNode = range->GetEndContainer();
+  uint32_t startOffset = range->StartOffset();
+  uint32_t endOffset = range->EndOffset();
+
+  // Make sure start is before end, by swapping DOM points.  This occurs when
+  // the user selects backwards in the text.
+  const Maybe<int32_t> order =
+      nsContentUtils::ComparePoints(endNode, endOffset, startNode, startOffset);
+
+  if (!order) {
+    MOZ_ASSERT_UNREACHABLE();
+    return false;
+  }
+
+  if (*order < 0) {
+    std::swap(startNode, endNode);
+    std::swap(startOffset, endOffset);
+  }
+
+  if (!startNode->IsInclusiveDescendantOf(mContent)) {
+    *aStartOffset = 0;
+  } else {
+    *aStartOffset =
+        DOMPointToOffset(startNode, AssertedCast<int32_t>(startOffset));
+  }
+
+  if (!endNode->IsInclusiveDescendantOf(mContent)) {
+    *aEndOffset = CharacterCount();
+  } else {
+    *aEndOffset =
+        DOMPointToOffset(endNode, AssertedCast<int32_t>(endOffset), true);
+  }
+  return true;
+}
+
+bool HyperTextAccessible::RemoveFromSelection(int32_t aSelectionNum) {
+  RefPtr<dom::Selection> domSel = DOMSelection();
+  if (!domSel) return false;
+
+  if (aSelectionNum < 0 ||
+      aSelectionNum >= static_cast<int32_t>(domSel->RangeCount())) {
+    return false;
+  }
+
+  const RefPtr<nsRange> range{
+      domSel->GetRangeAt(static_cast<uint32_t>(aSelectionNum))};
+  domSel->RemoveRangeAndUnselectFramesAndNotifyListeners(*range,
+                                                         IgnoreErrors());
+  return true;
+}
+
+void HyperTextAccessible::ScrollSubstringToPoint(int32_t aStartOffset,
+                                                 int32_t aEndOffset,
+                                                 uint32_t aCoordinateType,
+                                                 int32_t aX, int32_t aY) {
+  nsIFrame* frame = GetFrame();
+  if (!frame) return;
+
+  LayoutDeviceIntPoint coords =
+      nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordinateType, this);
+
+  RefPtr<nsRange> domRange = nsRange::Create(mContent);
+  TextRange range(this, this, aStartOffset, this, aEndOffset);
+  if (!range.AssignDOMRange(domRange)) {
+    return;
+  }
+
+  nsPresContext* presContext = frame->PresContext();
+  nsPoint coordsInAppUnits = LayoutDeviceIntPoint::ToAppUnits(
+      coords, presContext->AppUnitsPerDevPixel());
+
+  bool initialScrolled = false;
+  nsIFrame* parentFrame = frame;
+  while ((parentFrame = parentFrame->GetParent())) {
+    nsIScrollableFrame* scrollableFrame = do_QueryFrame(parentFrame);
+    if (scrollableFrame) {
+      if (!initialScrolled) {
+        // Scroll substring to the given point. Turn the point into percents
+        // relative scrollable area to use nsCoreUtils::ScrollSubstringTo.
+        nsRect frameRect = parentFrame->GetScreenRectInAppUnits();
+        nscoord offsetPointX = coordsInAppUnits.x - frameRect.X();
+        nscoord offsetPointY = coordsInAppUnits.y - frameRect.Y();
+
+        nsSize size(parentFrame->GetSize());
+
+        // avoid divide by zero
+        size.width = size.width ? size.width : 1;
+        size.height = size.height ? size.height : 1;
+
+        int16_t hPercent = offsetPointX * 100 / size.width;
+        int16_t vPercent = offsetPointY * 100 / size.height;
+
+        nsresult rv = nsCoreUtils::ScrollSubstringTo(
+            frame, domRange,
+            ScrollAxis(WhereToScroll(vPercent), WhenToScroll::Always),
+            ScrollAxis(WhereToScroll(hPercent), WhenToScroll::Always));
+        if (NS_FAILED(rv)) return;
+
+        initialScrolled = true;
+      } else {
+        // Substring was scrolled to the given point already inside its closest
+        // scrollable area. If there are nested scrollable areas then make
+        // sure we scroll lower areas to the given point inside currently
+        // traversed scrollable area.
+        nsCoreUtils::ScrollFrameToPoint(parentFrame, frame, coords);
+      }
+    }
+    frame = parentFrame;
+  }
+}
+
+void HyperTextAccessible::EnclosingRange(a11y::TextRange& aRange) const {
+  if (IsTextField()) {
+    aRange.Set(mDoc, const_cast<HyperTextAccessible*>(this), 0,
+               const_cast<HyperTextAccessible*>(this), CharacterCount());
+  } else {
+    aRange.Set(mDoc, mDoc, 0, mDoc, mDoc->CharacterCount());
+  }
+}
+
+void HyperTextAccessible::SelectionRanges(
+    nsTArray<a11y::TextRange>* aRanges) const {
+  dom::Selection* sel = DOMSelection();
+  if (!sel) {
+    return;
+  }
+
+  TextRange::TextRangesFromSelection(sel, aRanges);
+}
+
+void HyperTextAccessible::VisibleRanges(
+    nsTArray<a11y::TextRange>* aRanges) const {}
+
+void HyperTextAccessible::RangeByChild(LocalAccessible* aChild,
+                                       a11y::TextRange& aRange) const {
+  HyperTextAccessible* ht = aChild->AsHyperText();
+  if (ht) {
+    aRange.Set(mDoc, ht, 0, ht, ht->CharacterCount());
+    return;
+  }
+
+  LocalAccessible* child = aChild;
+  LocalAccessible* parent = nullptr;
+  while ((parent = child->LocalParent()) && !(ht = parent->AsHyperText())) {
+    child = parent;
+  }
+
+  // If no text then return collapsed text range, otherwise return a range
+  // containing the text enclosed by the given child.
+  if (ht) {
+    int32_t childIdx = child->IndexInParent();
+    int32_t startOffset = ht->GetChildOffset(childIdx);
+    int32_t endOffset =
+        child->IsTextLeaf() ? ht->GetChildOffset(childIdx + 1) : startOffset;
+    aRange.Set(mDoc, ht, startOffset, ht, endOffset);
+  }
+}
+
+void HyperTextAccessible::RangeAtPoint(int32_t aX, int32_t aY,
+                                       a11y::TextRange& aRange) const {
+  LocalAccessible* child =
+      mDoc->LocalChildAtPoint(aX, aY, EWhichChildAtPoint::DeepestChild);
+  if (!child) return;
+
+  LocalAccessible* parent = nullptr;
+  while ((parent = child->LocalParent()) && !parent->IsHyperText()) {
+    child = parent;
+  }
+
+  // Return collapsed text range for the point.
+  if (parent) {
+    HyperTextAccessible* ht = parent->AsHyperText();
+    int32_t offset = ht->GetChildOffset(child);
+    aRange.Set(mDoc, ht, offset, ht, offset);
+  }
+}
+
+void HyperTextAccessible::ReplaceText(const nsAString& aText) {
+  if (aText.Length() == 0) {
+    DeleteText(0, CharacterCount());
+    return;
+  }
+
+  SetSelectionRange(0, CharacterCount());
+
+  RefPtr<EditorBase> editorBase = GetEditor();
+  if (!editorBase) {
+    return;
+  }
+
+  DebugOnly<nsresult> rv = editorBase->InsertTextAsAction(aText);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert the new text");
+}
+
+void HyperTextAccessible::InsertText(const nsAString& aText,
+                                     int32_t aPosition) {
+  RefPtr<EditorBase> editorBase = GetEditor();
+  if (editorBase) {
+    SetSelectionRange(aPosition, aPosition);
+    DebugOnly<nsresult> rv = editorBase->InsertTextAsAction(aText);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert the text");
+  }
+}
+
+void HyperTextAccessible::CopyText(int32_t aStartPos, int32_t aEndPos) {
+  RefPtr<EditorBase> editorBase = GetEditor();
+  if (editorBase) {
+    SetSelectionRange(aStartPos, aEndPos);
+    editorBase->Copy();
+  }
+}
+
+void HyperTextAccessible::CutText(int32_t aStartPos, int32_t aEndPos) {
+  RefPtr<EditorBase> editorBase = GetEditor();
+  if (editorBase) {
+    SetSelectionRange(aStartPos, aEndPos);
+    editorBase->Cut();
+  }
+}
+
+void HyperTextAccessible::DeleteText(int32_t aStartPos, int32_t aEndPos) {
+  RefPtr<EditorBase> editorBase = GetEditor();
+  if (!editorBase) {
+    return;
+  }
+  SetSelectionRange(aStartPos, aEndPos);
+  DebugOnly<nsresult> rv =
+      editorBase->DeleteSelectionAsAction(nsIEditor::eNone, nsIEditor::eStrip);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to delete text");
+}
+
+void HyperTextAccessible::PasteText(int32_t aPosition) {
+  RefPtr<EditorBase> editorBase = GetEditor();
+  if (editorBase) {
+    SetSelectionRange(aPosition, aPosition);
+    editorBase->PasteAsAction(nsIClipboard::kGlobalClipboard,
+                              EditorBase::DispatchPasteEvent::Yes);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible public
+
+// LocalAccessible protected
+ENameValueFlag HyperTextAccessible::NativeName(nsString& aName) const {
+  // Check @alt attribute for invalid img elements.
+  if (mContent->IsHTMLElement(nsGkAtoms::img)) {
+    mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::alt, aName);
+    if (!aName.IsEmpty()) return eNameOK;
+  }
+
+  ENameValueFlag nameFlag = AccessibleWrap::NativeName(aName);
+  if (!aName.IsEmpty()) return nameFlag;
+
+  // Get name from title attribute for HTML abbr and acronym elements making it
+  // a valid name from markup. Otherwise their name isn't picked up by recursive
+  // name computation algorithm. See NS_OK_NAME_FROM_TOOLTIP.
+  if (IsAbbreviation() && mContent->AsElement()->GetAttr(
+                              kNameSpaceID_None, nsGkAtoms::title, aName)) {
+    aName.CompressWhitespace();
+  }
+
+  return eNameOK;
+}
+
+void HyperTextAccessible::Shutdown() {
+  mOffsets.Clear();
+  AccessibleWrap::Shutdown();
+}
+
+bool HyperTextAccessible::RemoveChild(LocalAccessible* aAccessible) {
+  const int32_t childIndex = aAccessible->IndexInParent();
+  if (childIndex < static_cast<int32_t>(mOffsets.Length())) {
+    mOffsets.RemoveLastElements(mOffsets.Length() - childIndex);
+  }
+
+  return AccessibleWrap::RemoveChild(aAccessible);
+}
+
+bool HyperTextAccessible::InsertChildAt(uint32_t aIndex,
+                                        LocalAccessible* aChild) {
+  if (aIndex < mOffsets.Length()) {
+    mOffsets.RemoveLastElements(mOffsets.Length() - aIndex);
+  }
+
+  return AccessibleWrap::InsertChildAt(aIndex, aChild);
+}
+
+Relation HyperTextAccessible::RelationByType(RelationType aType) const {
+  Relation rel = LocalAccessible::RelationByType(aType);
+
+  switch (aType) {
+    case RelationType::NODE_CHILD_OF:
+      if (HasOwnContent() && mContent->IsMathMLElement()) {
+        LocalAccessible* parent = LocalParent();
+        if (parent) {
+          nsIContent* parentContent = parent->GetContent();
+          if (parentContent &&
+              parentContent->IsMathMLElement(nsGkAtoms::mroot_)) {
+            // Add a relation pointing to the parent <mroot>.
+            rel.AppendTarget(parent);
+          }
+        }
+      }
+      break;
+    case RelationType::NODE_PARENT_OF:
+      if (HasOwnContent() && mContent->IsMathMLElement(nsGkAtoms::mroot_)) {
+        LocalAccessible* base = LocalChildAt(0);
+        LocalAccessible* index = LocalChildAt(1);
+        if (base && index) {
+          // Append the <mroot> children in the order index, base.
+          rel.AppendTarget(index);
+          rel.AppendTarget(base);
+        }
+      }
+      break;
+    default:
+      break;
+  }
+
+  return rel;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// HyperTextAccessible public static
+
+nsresult HyperTextAccessible::ContentToRenderedOffset(
+    nsIFrame* aFrame, int32_t aContentOffset, uint32_t* aRenderedOffset) const {
+  if (!aFrame) {
+    // Current frame not rendered -- this can happen if text is set on
+    // something with display: none
+    *aRenderedOffset = 0;
+    return NS_OK;
+  }
+
+  if (IsTextField()) {
+    *aRenderedOffset = aContentOffset;
+    return NS_OK;
+  }
+
+  NS_ASSERTION(aFrame->IsTextFrame(), "Need text frame for offset conversion");
+  NS_ASSERTION(aFrame->GetPrevContinuation() == nullptr,
+               "Call on primary frame only");
+
+  nsIFrame::RenderedText text =
+      aFrame->GetRenderedText(aContentOffset, aContentOffset + 1,
+                              nsIFrame::TextOffsetType::OffsetsInContentText,
+                              nsIFrame::TrailingWhitespace::DontTrim);
+  *aRenderedOffset = text.mOffsetWithinNodeRenderedText;
+
+  return NS_OK;
+}
+
+nsresult HyperTextAccessible::RenderedToContentOffset(
+    nsIFrame* aFrame, uint32_t aRenderedOffset, int32_t* aContentOffset) const {
+  if (IsTextField()) {
+    *aContentOffset = aRenderedOffset;
+    return NS_OK;
+  }
+
+  *aContentOffset = 0;
+  NS_ENSURE_TRUE(aFrame, NS_ERROR_FAILURE);
+
+  NS_ASSERTION(aFrame->IsTextFrame(), "Need text frame for offset conversion");
+  NS_ASSERTION(aFrame->GetPrevContinuation() == nullptr,
+               "Call on primary frame only");
+
+  nsIFrame::RenderedText text =
+      aFrame->GetRenderedText(aRenderedOffset, aRenderedOffset + 1,
+                              nsIFrame::TextOffsetType::OffsetsInRenderedText,
+                              nsIFrame::TrailingWhitespace::DontTrim);
+  *aContentOffset = text.mOffsetWithinNodeText;
+
+  return NS_OK;
+}