Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 626 insertions, 0 deletions

diff --git a/accessible/base/nsAccUtils.cpp b/accessible/base/nsAccUtils.cpp
new file mode 100644
index 0000000000..82af56348f
--- /dev/null
+++ b/accessible/base/nsAccUtils.cpp
@@ -0,0 +1,626 @@
+/* -*- 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 "nsAccUtils.h"
+
+#include "AccAttributes.h"
+#include "ARIAMap.h"
+#include "nsCoreUtils.h"
+#include "nsGenericHTMLElement.h"
+#include "DocAccessible.h"
+#include "DocAccessibleParent.h"
+#include "HyperTextAccessible.h"
+#include "nsIAccessibleTypes.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+#include "TextLeafAccessible.h"
+
+#include "nsIBaseWindow.h"
+#include "nsIDocShellTreeOwner.h"
+#include "nsIDOMXULContainerElement.h"
+#include "mozilla/a11y/RemoteAccessible.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ElementInternals.h"
+#include "nsAccessibilityService.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+void nsAccUtils::SetAccGroupAttrs(AccAttributes* aAttributes, int32_t aLevel,
+                                  int32_t aSetSize, int32_t aPosInSet) {
+  nsAutoString value;
+
+  if (aLevel) {
+    aAttributes->SetAttribute(nsGkAtoms::level, aLevel);
+  }
+
+  if (aSetSize && aPosInSet) {
+    aAttributes->SetAttribute(nsGkAtoms::posinset, aPosInSet);
+    aAttributes->SetAttribute(nsGkAtoms::setsize, aSetSize);
+  }
+}
+
+int32_t nsAccUtils::GetLevelForXULContainerItem(nsIContent* aContent) {
+  nsCOMPtr<nsIDOMXULContainerItemElement> item =
+      aContent->AsElement()->AsXULContainerItem();
+  if (!item) return 0;
+
+  nsCOMPtr<dom::Element> containerElement;
+  item->GetParentContainer(getter_AddRefs(containerElement));
+  nsCOMPtr<nsIDOMXULContainerElement> container =
+      containerElement ? containerElement->AsXULContainer() : nullptr;
+  if (!container) return 0;
+
+  // Get level of the item.
+  int32_t level = -1;
+  while (container) {
+    level++;
+
+    container->GetParentContainer(getter_AddRefs(containerElement));
+    container = containerElement ? containerElement->AsXULContainer() : nullptr;
+  }
+
+  return level;
+}
+
+void nsAccUtils::SetLiveContainerAttributes(AccAttributes* aAttributes,
+                                            Accessible* aStartAcc) {
+  nsAutoString live, relevant, busy;
+  nsStaticAtom* role = nullptr;
+  Maybe<bool> atomic;
+  for (Accessible* acc = aStartAcc; acc; acc = acc->Parent()) {
+    // We only want the nearest value for each attribute. If we already got a
+    // value, don't bother fetching it from further ancestors.
+    const bool wasLiveEmpty = live.IsEmpty();
+    acc->LiveRegionAttributes(wasLiveEmpty ? &live : nullptr,
+                              relevant.IsEmpty() ? &relevant : nullptr,
+                              atomic ? nullptr : &atomic,
+                              busy.IsEmpty() ? &busy : nullptr);
+    if (wasLiveEmpty) {
+      const nsRoleMapEntry* roleMap = acc->ARIARoleMap();
+      if (live.IsEmpty()) {
+        // aria-live wasn't explicitly set. See if an aria-live value is implied
+        // by an ARIA role or markup element.
+        if (roleMap) {
+          GetLiveAttrValue(roleMap->liveAttRule, live);
+        } else if (nsStaticAtom* value = GetAccService()->MarkupAttribute(
+                       acc, nsGkAtoms::aria_live)) {
+          value->ToString(live);
+        }
+      }
+      if (!live.IsEmpty() && roleMap &&
+          roleMap->roleAtom != nsGkAtoms::_empty) {
+        role = roleMap->roleAtom;
+      }
+    }
+    if (acc->IsDoc()) {
+      break;
+    }
+  }
+  if (!live.IsEmpty()) {
+    aAttributes->SetAttribute(nsGkAtoms::containerLive, std::move(live));
+  }
+  if (role) {
+    aAttributes->SetAttribute(nsGkAtoms::containerLiveRole, std::move(role));
+  }
+  if (!relevant.IsEmpty()) {
+    aAttributes->SetAttribute(nsGkAtoms::containerRelevant,
+                              std::move(relevant));
+  }
+  if (atomic) {
+    aAttributes->SetAttribute(nsGkAtoms::containerAtomic, *atomic);
+  }
+  if (!busy.IsEmpty()) {
+    aAttributes->SetAttribute(nsGkAtoms::containerBusy, std::move(busy));
+  }
+}
+
+bool nsAccUtils::HasDefinedARIAToken(nsIContent* aContent, nsAtom* aAtom) {
+  NS_ASSERTION(aContent, "aContent is null in call to HasDefinedARIAToken!");
+
+  if (!aContent->IsElement()) return false;
+
+  dom::Element* element = aContent->AsElement();
+  if (auto* htmlElement = nsGenericHTMLElement::FromNode(element);
+      htmlElement && !element->HasAttr(aAtom)) {
+    const auto* defaults = GetARIADefaults(htmlElement);
+    if (!defaults) {
+      return false;
+    }
+    return HasDefinedARIAToken(defaults, aAtom);
+  }
+  return HasDefinedARIAToken(&element->GetAttrs(), aAtom);
+}
+
+bool nsAccUtils::HasDefinedARIAToken(const AttrArray* aAttrs, nsAtom* aAtom) {
+  return aAttrs->HasAttr(aAtom) &&
+         !aAttrs->AttrValueIs(kNameSpaceID_None, aAtom, nsGkAtoms::_empty,
+                              eCaseMatters) &&
+         !aAttrs->AttrValueIs(kNameSpaceID_None, aAtom, nsGkAtoms::_undefined,
+                              eCaseMatters);
+}
+
+nsStaticAtom* nsAccUtils::NormalizeARIAToken(const AttrArray* aAttrs,
+                                             nsAtom* aAttr) {
+  if (!HasDefinedARIAToken(aAttrs, aAttr)) {
+    return nsGkAtoms::_empty;
+  }
+
+  if (aAttr == nsGkAtoms::aria_current) {
+    static AttrArray::AttrValuesArray tokens[] = {
+        nsGkAtoms::page, nsGkAtoms::step, nsGkAtoms::location_,
+        nsGkAtoms::date, nsGkAtoms::time, nsGkAtoms::_true,
+        nullptr};
+    int32_t idx =
+        aAttrs->FindAttrValueIn(kNameSpaceID_None, aAttr, tokens, eCaseMatters);
+    // If the token is present, return it, otherwise TRUE as per spec.
+    return (idx >= 0) ? tokens[idx] : nsGkAtoms::_true;
+  }
+
+  static AttrArray::AttrValuesArray tokens[] = {
+      nsGkAtoms::_false, nsGkAtoms::_true, nsGkAtoms::mixed, nullptr};
+  int32_t idx =
+      aAttrs->FindAttrValueIn(kNameSpaceID_None, aAttr, tokens, eCaseMatters);
+  if (idx >= 0) {
+    return tokens[idx];
+  }
+
+  return nullptr;
+}
+
+nsStaticAtom* nsAccUtils::NormalizeARIAToken(dom::Element* aElement,
+                                             nsAtom* aAttr) {
+  if (auto* htmlElement = nsGenericHTMLElement::FromNode(aElement);
+      htmlElement && !aElement->HasAttr(aAttr)) {
+    const auto* defaults = GetARIADefaults(htmlElement);
+    if (!defaults) {
+      return nsGkAtoms::_empty;
+    }
+    return NormalizeARIAToken(defaults, aAttr);
+  }
+  return NormalizeARIAToken(&aElement->GetAttrs(), aAttr);
+}
+
+Accessible* nsAccUtils::GetSelectableContainer(const Accessible* aAccessible,
+                                               uint64_t aState) {
+  if (!aAccessible) return nullptr;
+
+  if (!(aState & states::SELECTABLE)) return nullptr;
+  MOZ_ASSERT(!aAccessible->IsDoc());
+
+  const Accessible* parent = aAccessible;
+  while ((parent = parent->Parent()) && !parent->IsSelect()) {
+    if (parent->IsDoc() || parent->Role() == roles::PANE) {
+      return nullptr;
+    }
+  }
+  return const_cast<Accessible*>(parent);
+}
+
+LocalAccessible* nsAccUtils::GetSelectableContainer(
+    LocalAccessible* aAccessible, uint64_t aState) {
+  Accessible* selectable =
+      GetSelectableContainer(static_cast<Accessible*>(aAccessible), aState);
+  return selectable ? selectable->AsLocal() : nullptr;
+}
+
+bool nsAccUtils::IsDOMAttrTrue(const LocalAccessible* aAccessible,
+                               nsAtom* aAttr) {
+  dom::Element* el = aAccessible->Elm();
+  return el && ARIAAttrValueIs(el, aAttr, nsGkAtoms::_true, eCaseMatters);
+}
+
+Accessible* nsAccUtils::TableFor(Accessible* aAcc) {
+  if (!aAcc ||
+      (!aAcc->IsTable() && !aAcc->IsTableRow() && !aAcc->IsTableCell())) {
+    return nullptr;
+  }
+  Accessible* table = aAcc;
+  for (; table && !table->IsTable(); table = table->Parent()) {
+  }
+  // We don't assert (table && table->IsTable()) here because
+  // it's possible for this tree walk to yield no table at all
+  // ex. because a table part has been moved in the tree
+  // using aria-owns.
+  return table;
+}
+
+LocalAccessible* nsAccUtils::TableFor(LocalAccessible* aRow) {
+  Accessible* table = TableFor(static_cast<Accessible*>(aRow));
+  return table ? table->AsLocal() : nullptr;
+}
+
+HyperTextAccessible* nsAccUtils::GetTextContainer(nsINode* aNode) {
+  // Get text accessible containing the result node.
+  DocAccessible* doc = GetAccService()->GetDocAccessible(aNode->OwnerDoc());
+  LocalAccessible* accessible =
+      doc ? doc->GetAccessibleOrContainer(aNode) : nullptr;
+  if (!accessible) return nullptr;
+
+  do {
+    HyperTextAccessible* textAcc = accessible->AsHyperText();
+    if (textAcc) return textAcc;
+
+    accessible = accessible->LocalParent();
+  } while (accessible);
+
+  return nullptr;
+}
+
+LayoutDeviceIntPoint nsAccUtils::ConvertToScreenCoords(
+    int32_t aX, int32_t aY, uint32_t aCoordinateType, Accessible* aAccessible) {
+  LayoutDeviceIntPoint coords(aX, aY);
+
+  switch (aCoordinateType) {
+    // Regardless of coordinate type, the coords returned
+    // are in dev pixels.
+    case nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE:
+      break;
+
+    case nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE: {
+      coords += GetScreenCoordsForWindow(aAccessible);
+      break;
+    }
+
+    case nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE: {
+      coords += GetScreenCoordsForParent(aAccessible);
+      break;
+    }
+
+    default:
+      MOZ_ASSERT_UNREACHABLE("invalid coord type!");
+  }
+
+  return coords;
+}
+
+void nsAccUtils::ConvertScreenCoordsTo(int32_t* aX, int32_t* aY,
+                                       uint32_t aCoordinateType,
+                                       Accessible* aAccessible) {
+  switch (aCoordinateType) {
+    // Regardless of coordinate type, the values returned for
+    // aX and aY are in dev pixels.
+    case nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE:
+      break;
+
+    case nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE: {
+      LayoutDeviceIntPoint coords = GetScreenCoordsForWindow(aAccessible);
+      *aX -= coords.x;
+      *aY -= coords.y;
+      break;
+    }
+
+    case nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE: {
+      LayoutDeviceIntPoint coords = GetScreenCoordsForParent(aAccessible);
+      *aX -= coords.x;
+      *aY -= coords.y;
+      break;
+    }
+
+    default:
+      MOZ_ASSERT_UNREACHABLE("invalid coord type!");
+  }
+}
+
+LayoutDeviceIntPoint nsAccUtils::GetScreenCoordsForParent(
+    Accessible* aAccessible) {
+  if (!aAccessible) return LayoutDeviceIntPoint();
+
+  if (Accessible* parent = aAccessible->Parent()) {
+    LayoutDeviceIntRect parentBounds = parent->Bounds();
+    // The rect returned from Bounds() is already in dev
+    // pixels, so we don't need to do any conversion here.
+    return parentBounds.TopLeft();
+  }
+
+  return LayoutDeviceIntPoint();
+}
+
+LayoutDeviceIntPoint nsAccUtils::GetScreenCoordsForWindow(
+    Accessible* aAccessible) {
+  LayoutDeviceIntPoint coords(0, 0);
+  a11y::LocalAccessible* localAcc = aAccessible->AsLocal();
+  if (!localAcc) {
+    localAcc = aAccessible->AsRemote()->OuterDocOfRemoteBrowser();
+    if (!localAcc) {
+      // This could be null if the tab is closing but the document is still
+      // being shut down.
+      return coords;
+    }
+  }
+
+  nsCOMPtr<nsIDocShellTreeItem> treeItem(
+      nsCoreUtils::GetDocShellFor(localAcc->GetNode()));
+  if (!treeItem) return coords;
+
+  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
+  treeItem->GetTreeOwner(getter_AddRefs(treeOwner));
+  if (!treeOwner) return coords;
+
+  nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(treeOwner);
+  if (baseWindow) {
+    baseWindow->GetPosition(&coords.x.value,
+                            &coords.y.value);  // in device pixels
+  }
+
+  return coords;
+}
+
+bool nsAccUtils::GetLiveAttrValue(uint32_t aRule, nsAString& aValue) {
+  switch (aRule) {
+    case eOffLiveAttr:
+      aValue = u"off"_ns;
+      return true;
+    case ePoliteLiveAttr:
+      aValue = u"polite"_ns;
+      return true;
+    case eAssertiveLiveAttr:
+      aValue = u"assertive"_ns;
+      return true;
+  }
+
+  return false;
+}
+
+#ifdef DEBUG
+
+bool nsAccUtils::IsTextInterfaceSupportCorrect(LocalAccessible* aAccessible) {
+  // Don't test for accessible docs, it makes us create accessibles too
+  // early and fire mutation events before we need to
+  if (aAccessible->IsDoc()) return true;
+
+  bool foundText = false;
+  uint32_t childCount = aAccessible->ChildCount();
+  for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
+    LocalAccessible* child = aAccessible->LocalChildAt(childIdx);
+    if (child && child->IsText()) {
+      foundText = true;
+      break;
+    }
+  }
+
+  return !foundText || aAccessible->IsHyperText();
+}
+#endif
+
+uint32_t nsAccUtils::TextLength(Accessible* aAccessible) {
+  if (!aAccessible->IsText()) {
+    return 1;
+  }
+
+  if (LocalAccessible* localAcc = aAccessible->AsLocal()) {
+    TextLeafAccessible* textLeaf = localAcc->AsTextLeaf();
+    if (textLeaf) {
+      return textLeaf->Text().Length();
+    }
+  } else if (aAccessible->IsText()) {
+    RemoteAccessible* remoteAcc = aAccessible->AsRemote();
+    MOZ_ASSERT(remoteAcc);
+    return remoteAcc->GetCachedTextLength();
+  }
+
+  // For list bullets (or anything other accessible which would compute its own
+  // text. They don't have their own frame.
+  // XXX In the future, list bullets may have frame and anon content, so
+  // we should be able to remove this at that point
+  nsAutoString text;
+  aAccessible->AppendTextTo(text);  // Get all the text
+  return text.Length();
+}
+
+bool nsAccUtils::MustPrune(Accessible* aAccessible) {
+  MOZ_ASSERT(aAccessible);
+  roles::Role role = aAccessible->Role();
+
+  if (role == roles::SLIDER || role == roles::PROGRESSBAR) {
+    // Always prune the tree for sliders and progressbars, as it doesn't make
+    // sense for either to have descendants. Per the ARIA spec, children of
+    // these elements are presentational. They also confuse NVDA.
+    return true;
+  }
+
+  if (role != roles::MENUITEM && role != roles::COMBOBOX_OPTION &&
+      role != roles::OPTION && role != roles::ENTRY &&
+      role != roles::FLAT_EQUATION && role != roles::PASSWORD_TEXT &&
+      role != roles::PUSHBUTTON && role != roles::TOGGLE_BUTTON &&
+      role != roles::GRAPHIC && role != roles::SEPARATOR) {
+    // If it doesn't match any of these roles, don't prune its children.
+    return false;
+  }
+
+  if (aAccessible->ChildCount() != 1) {
+    // If the accessible has more than one child, don't prune it.
+    return false;
+  }
+
+  roles::Role childRole = aAccessible->FirstChild()->Role();
+  // If the accessible's child is a text leaf, prune the accessible.
+  return childRole == roles::TEXT_LEAF || childRole == roles::STATICTEXT;
+}
+
+bool nsAccUtils::IsARIALive(const LocalAccessible* aAccessible) {
+  // Get computed aria-live property based on the closest container with the
+  // attribute. Inner nodes override outer nodes within the same
+  // document.
+  // This should be the same as the container-live attribute, but we don't need
+  // the other container-* attributes, so we can't use the same function.
+  nsIContent* ancestor = aAccessible->GetContent();
+  if (!ancestor) {
+    return false;
+  }
+  dom::Document* doc = ancestor->GetComposedDoc();
+  if (!doc) {
+    return false;
+  }
+  dom::Element* topEl = doc->GetRootElement();
+  while (ancestor) {
+    const nsRoleMapEntry* role = nullptr;
+    if (ancestor->IsElement()) {
+      role = aria::GetRoleMap(ancestor->AsElement());
+    }
+    nsAutoString live;
+    if (HasDefinedARIAToken(ancestor, nsGkAtoms::aria_live)) {
+      GetARIAAttr(ancestor->AsElement(), nsGkAtoms::aria_live, live);
+    } else if (role) {
+      GetLiveAttrValue(role->liveAttRule, live);
+    } else if (nsStaticAtom* value = GetAccService()->MarkupAttribute(
+                   ancestor, nsGkAtoms::aria_live)) {
+      value->ToString(live);
+    }
+    if (!live.IsEmpty() && !live.EqualsLiteral("off")) {
+      return true;
+    }
+
+    if (ancestor == topEl) {
+      break;
+    }
+
+    ancestor = ancestor->GetParent();
+    if (!ancestor) {
+      ancestor = topEl;  // Use <body>/<frameset>
+    }
+  }
+
+  return false;
+}
+
+Accessible* nsAccUtils::DocumentFor(Accessible* aAcc) {
+  if (!aAcc) {
+    return nullptr;
+  }
+  if (LocalAccessible* localAcc = aAcc->AsLocal()) {
+    return localAcc->Document();
+  }
+  return aAcc->AsRemote()->Document();
+}
+
+Accessible* nsAccUtils::GetAccessibleByID(Accessible* aDoc, uint64_t aID) {
+  if (!aDoc) {
+    return nullptr;
+  }
+  if (LocalAccessible* localAcc = aDoc->AsLocal()) {
+    if (DocAccessible* doc = localAcc->AsDoc()) {
+      if (!aID) {
+        // GetAccessibleByUniqueID doesn't treat 0 as the document.
+        return aDoc;
+      }
+      return doc->GetAccessibleByUniqueID(
+          reinterpret_cast<void*>(static_cast<uintptr_t>(aID)));
+    }
+  } else if (DocAccessibleParent* doc = aDoc->AsRemote()->AsDoc()) {
+    return doc->GetAccessible(aID);
+  }
+  return nullptr;
+}
+
+void nsAccUtils::DocumentURL(Accessible* aDoc, nsAString& aURL) {
+  MOZ_ASSERT(aDoc && aDoc->IsDoc());
+  if (LocalAccessible* localAcc = aDoc->AsLocal()) {
+    return localAcc->AsDoc()->URL(aURL);
+  }
+  return aDoc->AsRemote()->AsDoc()->URL(aURL);
+}
+
+void nsAccUtils::DocumentMimeType(Accessible* aDoc, nsAString& aMimeType) {
+  MOZ_ASSERT(aDoc && aDoc->IsDoc());
+  if (LocalAccessible* localAcc = aDoc->AsLocal()) {
+    return localAcc->AsDoc()->MimeType(aMimeType);
+  }
+  return aDoc->AsRemote()->AsDoc()->MimeType(aMimeType);
+}
+
+// ARIA Accessibility Default Accessors
+const AttrArray* nsAccUtils::GetARIADefaults(dom::Element* aElement) {
+  auto* element = nsGenericHTMLElement::FromNode(aElement);
+  if (!element) {
+    return nullptr;
+  }
+  auto* internals = element->GetInternals();
+  if (!internals) {
+    return nullptr;
+  }
+  return &internals->GetAttrs();
+}
+
+bool nsAccUtils::HasARIAAttr(dom::Element* aElement, const nsAtom* aName) {
+  if (aElement->HasAttr(aName)) {
+    return true;
+  }
+  const auto* defaults = GetARIADefaults(aElement);
+  if (!defaults) {
+    return false;
+  }
+  return defaults->HasAttr(aName);
+}
+
+bool nsAccUtils::GetARIAAttr(dom::Element* aElement, const nsAtom* aName,
+                             nsAString& aResult) {
+  if (aElement->GetAttr(aName, aResult)) {
+    return true;
+  }
+  const auto* defaults = GetARIADefaults(aElement);
+  if (!defaults) {
+    return false;
+  }
+  return defaults->GetAttr(aName, aResult);
+}
+
+const nsAttrValue* nsAccUtils::GetARIAAttr(dom::Element* aElement,
+                                           const nsAtom* aName) {
+  if (const auto* val = aElement->GetParsedAttr(aName, kNameSpaceID_None)) {
+    return val;
+  }
+  const auto* defaults = GetARIADefaults(aElement);
+  if (!defaults) {
+    return nullptr;
+  }
+  return defaults->GetAttr(aName, kNameSpaceID_None);
+}
+
+bool nsAccUtils::ARIAAttrValueIs(dom::Element* aElement, const nsAtom* aName,
+                                 const nsAString& aValue,
+                                 nsCaseTreatment aCaseSensitive) {
+  if (aElement->AttrValueIs(kNameSpaceID_None, aName, aValue, aCaseSensitive)) {
+    return true;
+  }
+  const auto* defaults = GetARIADefaults(aElement);
+  if (!defaults) {
+    return false;
+  }
+  return defaults->AttrValueIs(kNameSpaceID_None, aName, aValue,
+                               aCaseSensitive);
+}
+
+bool nsAccUtils::ARIAAttrValueIs(dom::Element* aElement, const nsAtom* aName,
+                                 const nsAtom* aValue,
+                                 nsCaseTreatment aCaseSensitive) {
+  if (aElement->AttrValueIs(kNameSpaceID_None, aName, aValue, aCaseSensitive)) {
+    return true;
+  }
+  const auto* defaults = GetARIADefaults(aElement);
+  if (!defaults) {
+    return false;
+  }
+  return defaults->AttrValueIs(kNameSpaceID_None, aName, aValue,
+                               aCaseSensitive);
+}
+
+int32_t nsAccUtils::FindARIAAttrValueIn(dom::Element* aElement,
+                                        const nsAtom* aName,
+                                        AttrArray::AttrValuesArray* aValues,
+                                        nsCaseTreatment aCaseSensitive) {
+  int32_t index = aElement->FindAttrValueIn(kNameSpaceID_None, aName, aValues,
+                                            aCaseSensitive);
+  if (index == AttrArray::ATTR_MISSING) {
+    const auto* defaults = GetARIADefaults(aElement);
+    if (!defaults) {
+      return index;
+    }
+    index = defaults->FindAttrValueIn(kNameSpaceID_None, aName, aValues,
+                                      aCaseSensitive);
+  }
+  return index;
+}