/* 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 "nsGenericHTMLElement.h"

#include "HTMLBRElement.h"
#include "HTMLFieldSetElement.h"
#include "ReferrerInfo.h"
#include "imgIContainer.h"
#include "mozilla/EditorBase.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/FocusModel.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/IMEContentObserver.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/MappedDeclarationsBuilder.h"
#include "mozilla/Maybe.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresState.h"
#include "mozilla/StaticPrefs_accessibility.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/TextEditor.h"
#include "mozilla/TextEvents.h"
#include "mozilla/dom/AncestorIterator.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/CommandEvent.h"
#include "mozilla/dom/ContentList.h"
#include "mozilla/dom/CustomElementRegistry.h"
#include "mozilla/dom/DirectionalityUtils.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/DocumentOrShadowRoot.h"
#include "mozilla/dom/EditContext.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/ElementInternals.h"
#include "mozilla/dom/FetchPriority.h"
#include "mozilla/dom/FormData.h"
#include "mozilla/dom/FromParser.h"
#include "mozilla/dom/HTMLBodyElement.h"
#include "mozilla/dom/HTMLDialogElement.h"
#include "mozilla/dom/HTMLElementBinding.h"
#include "mozilla/dom/HTMLFormElement.h"
#include "mozilla/dom/HTMLHeadingElement.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/dom/HTMLLabelElement.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/InputEvent.h"
#include "mozilla/dom/Link.h"
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/dom/ScriptLoader.h"
#include "mozilla/dom/ShadowIncludingTreeIterator.h"
#include "mozilla/dom/ToggleEvent.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/UnbindContext.h"
#include "mozilla/intl/Locale.h"
#include "nsAtom.h"
#include "nsAttrValueOrString.h"
#include "nsCOMPtr.h"
#include "nsCaseTreatment.h"
#include "nsComputedDOMStyle.h"
#include "nsContainerFrame.h"
#include "nsContentUtils.h"
#include "nsDOMCSSDeclaration.h"
#include "nsDOMMutationObserver.h"
#include "nsDOMString.h"
#include "nsDOMStringMap.h"
#include "nsDOMTokenList.h"
#include "nsError.h"
#include "nsFocusManager.h"
#include "nsGkAtoms.h"
#include "nsGlobalWindowInner.h"
#include "nsHTMLDocument.h"
#include "nsHTMLParts.h"
#include "nsIContentInlines.h"
#include "nsIFormControl.h"
#include "nsIFrameInlines.h"
#include "nsILayoutHistoryState.h"
#include "nsIPrincipal.h"
#include "nsIWidget.h"
#include "nsLayoutUtils.h"
#include "nsPIDOMWindow.h"
#include "nsPresContext.h"
#include "nsQueryObject.h"
#include "nsRange.h"
#include "nsString.h"
#include "nsStyleUtil.h"
#include "nsTableCellFrame.h"
#include "nsTextNode.h"
#include "nsThreadUtils.h"
#include "nscore.h"

using namespace mozilla;
using namespace mozilla::dom;

static const uint8_t NS_INPUTMODE_NONE = 1;
static const uint8_t NS_INPUTMODE_TEXT = 2;
static const uint8_t NS_INPUTMODE_TEL = 3;
static const uint8_t NS_INPUTMODE_URL = 4;
static const uint8_t NS_INPUTMODE_EMAIL = 5;
static const uint8_t NS_INPUTMODE_NUMERIC = 6;
static const uint8_t NS_INPUTMODE_DECIMAL = 7;
static const uint8_t NS_INPUTMODE_SEARCH = 8;

static constexpr nsAttrValue::EnumTableEntry kInputmodeTable[] = {
    {"none", NS_INPUTMODE_NONE},       {"text", NS_INPUTMODE_TEXT},
    {"tel", NS_INPUTMODE_TEL},         {"url", NS_INPUTMODE_URL},
    {"email", NS_INPUTMODE_EMAIL},     {"numeric", NS_INPUTMODE_NUMERIC},
    {"decimal", NS_INPUTMODE_DECIMAL}, {"search", NS_INPUTMODE_SEARCH},
};

static const uint8_t NS_ENTERKEYHINT_ENTER = 1;
static const uint8_t NS_ENTERKEYHINT_DONE = 2;
static const uint8_t NS_ENTERKEYHINT_GO = 3;
static const uint8_t NS_ENTERKEYHINT_NEXT = 4;
static const uint8_t NS_ENTERKEYHINT_PREVIOUS = 5;
static const uint8_t NS_ENTERKEYHINT_SEARCH = 6;
static const uint8_t NS_ENTERKEYHINT_SEND = 7;

static constexpr nsAttrValue::EnumTableEntry kEnterKeyHintTable[] = {
    {"enter", NS_ENTERKEYHINT_ENTER},
    {"done", NS_ENTERKEYHINT_DONE},
    {"go", NS_ENTERKEYHINT_GO},
    {"next", NS_ENTERKEYHINT_NEXT},
    {"previous", NS_ENTERKEYHINT_PREVIOUS},
    {"search", NS_ENTERKEYHINT_SEARCH},
    {"send", NS_ENTERKEYHINT_SEND},
};

static const uint8_t NS_AUTOCAPITALIZE_NONE = 1;
static const uint8_t NS_AUTOCAPITALIZE_SENTENCES = 2;
static const uint8_t NS_AUTOCAPITALIZE_WORDS = 3;
static const uint8_t NS_AUTOCAPITALIZE_CHARACTERS = 4;
static const uint8_t NS_AUTOCAPITALIZE_OFF = 5;
static const uint8_t NS_AUTOCAPITALIZE_ON = 6;

static constexpr nsAttrValue::EnumTableEntry kAutocapitalizeTable[] = {
    {"none", NS_AUTOCAPITALIZE_NONE},
    {"sentences", NS_AUTOCAPITALIZE_SENTENCES},
    {"words", NS_AUTOCAPITALIZE_WORDS},
    {"characters", NS_AUTOCAPITALIZE_CHARACTERS},
    {"off", NS_AUTOCAPITALIZE_OFF},
    {"on", NS_AUTOCAPITALIZE_ON},
    {"", 0},
};

static constexpr const nsAttrValue::EnumTableEntry* kDefaultAutocapitalize =
    &kAutocapitalizeTable[1];

nsresult nsGenericHTMLElement::CopyInnerTo(Element* aDst) {
  MOZ_ASSERT(!aDst->GetUncomposedDoc(),
             "Should not CopyInnerTo an Element in a document");

  MOZ_TRY(Element::CopyInnerTo(aDst));

  // cloning a node must retain its internal nonce slot
  if (auto* nonce = static_cast<nsString*>(GetProperty(nsGkAtoms::nonce))) {
    static_cast<nsGenericHTMLElement*>(aDst)->SetNonce(*nonce);
  }
  return NS_OK;
}

static constexpr nsAttrValue::EnumTableEntry kDirTable[] = {
    {"ltr", Directionality::Ltr},
    {"rtl", Directionality::Rtl},
    {"auto", Directionality::Auto},
};

namespace {
// See <https://html.spec.whatwg.org/#the-popover-attribute>.
enum class PopoverAttributeKeyword : uint8_t {
  Auto,
  Hint,
  EmptyString,
  Manual
};

static constexpr const char kPopoverAttributeValueAuto[] = "auto";
static constexpr const char kPopoverAttributeValueHint[] = "hint";
static constexpr const char kPopoverAttributeValueEmptyString[] = "";
static constexpr const char kPopoverAttributeValueManual[] = "manual";

static constexpr nsAttrValue::EnumTableEntry kPopoverTable[] = {
    {kPopoverAttributeValueAuto, PopoverAttributeKeyword::Auto},
    {kPopoverAttributeValueHint, PopoverAttributeKeyword::Hint},
    {kPopoverAttributeValueEmptyString, PopoverAttributeKeyword::EmptyString},
    {kPopoverAttributeValueManual, PopoverAttributeKeyword::Manual},
};

// See <https://html.spec.whatwg.org/#the-popover-attribute>.
static const nsAttrValue::EnumTableEntry* kPopoverTableInvalidValueDefault =
    &kPopoverTable[3];
}  // namespace

void nsGenericHTMLElement::GetFetchPriority(nsAString& aFetchPriority) const {
  // <https://html.spec.whatwg.org/multipage/urls-and-fetching.html#fetch-priority-attributes>.
  GetEnumAttr(nsGkAtoms::fetchpriority, kFetchPriorityAttributeValueAuto,
              aFetchPriority);
}

/* static */
FetchPriority nsGenericHTMLElement::ToFetchPriority(const nsAString& aValue) {
  nsAttrValue attrValue;
  ParseFetchPriority(aValue, attrValue);
  MOZ_ASSERT(attrValue.Type() == nsAttrValue::eEnum);
  return FetchPriority(attrValue.GetEnumValue());
}

void nsGenericHTMLElement::AddToNameTable(nsAtom* aName) {
  MOZ_ASSERT(HasName(), "Node doesn't have name?");
  Document* doc = GetUncomposedDoc();
  if (doc && !IsInNativeAnonymousSubtree()) {
    doc->AddToNameTable(this, aName);
  }
}

void nsGenericHTMLElement::RemoveFromNameTable() {
  if (HasName() && CanHaveName(NodeInfo()->NameAtom())) {
    if (Document* doc = GetUncomposedDoc()) {
      doc->RemoveFromNameTable(this,
                               GetParsedAttr(nsGkAtoms::name)->GetAtomValue());
    }
  }
}

void nsGenericHTMLElement::GetAccessKeyLabel(nsString& aLabel) {
  nsAutoString suffix;
  GetAccessKey(suffix);
  if (!suffix.IsEmpty()) {
    EventStateManager::GetAccessKeyLabelPrefix(this, aLabel);
    aLabel.Append(suffix);
  }
}

// https://html.spec.whatwg.org/#dom-hidden
void nsGenericHTMLElement::GetHidden(
    Nullable<OwningBooleanOrUnrestrictedDoubleOrString>& aHidden) const {
  OwningBooleanOrUnrestrictedDoubleOrString value;
  // 1. If the hidden attribute is in the hidden until found state, then
  //    return "until-found".
  nsAutoString result;
  if (GetAttr(kNameSpaceID_None, nsGkAtoms::hidden, result)) {
    if (result.LowerCaseEqualsLiteral("until-found")) {
      value.SetStringLiteral(u"until-found");
    } else {
      // 2. If the hidden attribute is set, then return true.
      value.SetAsBoolean() = true;
    }
  } else {
    // 3. Return false.
    value.SetAsBoolean() = false;
  }

  aHidden.SetValue(value);
}

// https://html.spec.whatwg.org/#dom-hidden
void nsGenericHTMLElement::SetHidden(
    const Nullable<BooleanOrUnrestrictedDoubleOrString>& aHidden,
    ErrorResult& aRv) {
  // 4. Otherwise, if the given value is null, then remove the hidden attribute.
  if (aHidden.IsNull()) {
    return UnsetAttr(nsGkAtoms::hidden, aRv);
  }
  bool isHidden = true;
  const auto& value = aHidden.Value();
  // 1. If the given value is a string that is an ASCII case-insensitive match
  //    for "until-found", then set the hidden attribute to "until-found".
  if (value.IsString()) {
    const nsAString& stringValue = value.GetAsString();
    // 3. Otherwise, if the given value is the empty string, then remove the
    //    hidden attribute.
    if (stringValue.IsEmpty()) {
      isHidden = false;
    } else if (stringValue.LowerCaseEqualsLiteral("until-found")) {
      return SetAttr(nsGkAtoms::hidden, u"until-found"_ns, aRv);
    }
  }
  // 2. Otherwise, if the given value is false, then remove the hidden
  //    attribute.
  else if (value.IsBoolean()) {
    if (!value.GetAsBoolean()) {
      isHidden = false;
    }
  }
  // 5. Otherwise, if the given value is 0, then remove the hidden attribute.
  // 6. Otherwise, if the given value is NaN, then remove the hidden attribute.
  else if (value.IsUnrestrictedDouble()) {
    double d = value.GetAsUnrestrictedDouble();
    if (d == 0.0 || std::isnan(d)) {
      isHidden = false;
    }
  }

  // 7. Otherwise, set the hidden attribute to the empty string.
  if (isHidden) {
    aRv = SetAttr(kNameSpaceID_None, nsGkAtoms::hidden, u""_ns, true);
  } else {
    aRv = UnsetAttr(kNameSpaceID_None, nsGkAtoms::hidden, true);
  }
}

bool nsGenericHTMLElement::Spellcheck() {
  // Has the state has been explicitly set?
  nsIContent* node;
  for (node = this; node; node = node->GetParent()) {
    if (node->IsHTMLElement()) {
      static Element::AttrValuesArray strings[] = {nsGkAtoms::_true,
                                                   nsGkAtoms::_false, nullptr};
      switch (node->AsElement()->FindAttrValueIn(
          kNameSpaceID_None, nsGkAtoms::spellcheck, strings, eCaseMatters)) {
        case 0:  // spellcheck = "true"
          return true;
        case 1:  // spellcheck = "false"
          return false;
      }
    }
  }

  // contenteditable/designMode are spellchecked by default
  if (IsEditable()) {
    return true;
  }

  // Is this a chrome element?
  if (nsContentUtils::IsChromeDoc(OwnerDoc())) {
    return false;  // Not spellchecked by default
  }

  // Anything else that's not a form control is not spellchecked by default
  const nsIFormControl* formControl = GetAsFormControl();
  if (!formControl) {
    return false;  // Not spellchecked by default
  }

  // Is this a multiline plaintext input?
  auto controlType = formControl->ControlType();
  if (controlType == FormControlType::Textarea) {
    return true;  // Spellchecked by default
  }

  // Is this anything other than an input text?
  // Other inputs are not spellchecked.
  if (controlType != FormControlType::InputText) {
    return false;  // Not spellchecked by default
  }

  // Does the user want input text spellchecked by default?
  // NOTE: Do not reflect a pref value of 0 back to the DOM getter.
  // The web page should not know if the user has disabled spellchecking.
  // We'll catch this in the editor itself.
  int32_t spellcheckLevel = StaticPrefs::layout_spellcheckDefault();
  return spellcheckLevel == 2;  // "Spellcheck multi- and single-line"
}

bool nsGenericHTMLElement::Autocorrect() const {
  return !AttrValueIs(kNameSpaceID_None, nsGkAtoms::autocorrect, nsGkAtoms::OFF,
                      eIgnoreCase);
}

EditContext* nsGenericHTMLElement::GetEditContext() const {
  return EditContext::GetForElement(*this);
}

void nsGenericHTMLElement::SetEditContext(mozilla::dom::EditContext* aContext,
                                          mozilla::ErrorResult& aRv) {
  // https://w3c.github.io/edit-context/#ref-for-dom-htmlelement-editcontext-4
  // 1. If this's local name is neither a valid shadow host name nor "canvas",
  //    then throw a "NotSupportedError" DOMException.
  nsAtom* name = NodeInfo()->NameAtom();
  if (name == nsGkAtoms::canvas &&
      !StaticPrefs::dom_editcontext_allow_canvas()) {
    OwnerDoc()->SetUseCounter(eUseCounter_custom_EditContextCanvas);
    aRv.ThrowNotSupportedError(
        "<canvas>-based EditContext is currently disabled in Firefox due to "
        "accessibility concerns.");
    return;
  }
  if (name != nsGkAtoms::canvas &&
      !nsContentUtils::IsValidShadowHostName(name)) {
    aRv.ThrowNotSupportedError(
        nsFmtCString(FMT_STRING("EditContext can only be attached to <canvas> "
                                "and valid shadow hosts, not <{}>."),
                     NS_ConvertUTF16toUTF8(LocalName())));
    return;
  }
  // 2. If editContext is not null, then:
  if (aContext) {
    // 1. If editContext's associated element is equal to this, then terminate
    //    these steps.
    if (aContext->GetAssociatedElement() == this) {
      return;
    }
    // 2. If editContext's associated element is not null, then throw a
    //    "NotSupportedError" DOMException.
    if (aContext->GetAssociatedElement()) {
      aRv.ThrowNotSupportedError(
          "EditContext can only be attached to one element at a time.");
      return;
    }
  }
  // 3. Let oldEditContext be the value of this's internal [[EditContext]] slot.
  RefPtr<EditContext> oldEditContext = GetEditContext();
  if (oldEditContext) {
    // 4. If oldEditContext is not null and oldEditContext is this's node
    //    document's active EditContext, then:
    if (oldEditContext == OwnerDoc()->GetActiveEditContext()) {
      // 1. Run the steps to deactivate an EditContext with oldEditContext.
      oldEditContext->Deactivate();
      // 2. If oldEditContext's associated element is not equal to this, then
      //    terminate these steps.
      if (oldEditContext->GetAssociatedElement() != this) {
        return;
      }
      // 3. If editContext is not null, editContext's associated element is not
      //    null and editContext's associated element is not equal to this, then
      //    throw a "NotSupportedError" DOMException.
      if (aContext && aContext->GetAssociatedElement() &&
          aContext->GetAssociatedElement() != this) {
        aRv.ThrowNotSupportedError(
            "EditContext can only be attached to one element at a time.");
        return;
      }
    }
    // 5. If oldEditContext is not null, set oldEditContext's associated element
    //    to null.
    oldEditContext->SetAssociatedElement(nullptr);
  }
  // 6. If editContext is not null, then set editContext's associated element to
  //    this.
  if (aContext) {
    aContext->SetAssociatedElement(this);
  }
  // 7. Set this's internal [[EditContext]] slot to be editContext.
  if (aContext) {
    SetFlags(ELEMENT_HAS_EDIT_CONTEXT);
  } else {
    UnsetFlags(ELEMENT_HAS_EDIT_CONTEXT);
  }
  EditContext::SetForElement(*this, aContext);

  int32_t delta = (aContext != nullptr) - (oldEditContext != nullptr);
  if (delta) {
    ChangeEditableState(delta);
  }
  // Update the active EditContext since it might have changed.
  OwnerDoc()->UpdateTextEditContext();
}

bool nsGenericHTMLElement::InNavQuirksMode(Document* aDoc) {
  return aDoc && aDoc->GetCompatibilityMode() == eCompatibility_NavQuirks;
}

void nsGenericHTMLElement::UpdateEditableState(bool aNotify) {
  // XXX Should we do this only when in a document?
  if (GetEditContext()) {
    SetEditableFlag(true);
    UpdateReadOnlyState(aNotify);
    return;
  }
  ContentEditableState state = GetContentEditableState();
  if (state != ContentEditableState::Inherit) {
    SetEditableFlag(IsEditableState(state));
    UpdateReadOnlyState(aNotify);
    return;
  }
  nsStyledElement::UpdateEditableState(aNotify);
}

nsresult nsGenericHTMLElement::BindToTree(BindContext& aContext,
                                          nsINode& aParent) {
  nsresult rv = nsGenericHTMLElementBase::BindToTree(aContext, aParent);
  NS_ENSURE_SUCCESS(rv, rv);

  if (IsInComposedDoc()) {
    RegUnRegAccessKey(true);
  }

  if (IsInUncomposedDoc()) {
    Document& doc = aContext.OwnerDoc();
    if (HasName() && CanHaveName(NodeInfo()->NameAtom())) {
      doc.AddToNameTable(this, GetParsedAttr(nsGkAtoms::name)->GetAtomValue());
    }

    nsAtom* id = nullptr;
    if (ShouldExposeIdAsHTMLDocumentProperty(this)) {
      id = DoGetID();
      MOZ_ASSERT(id && id != nsGkAtoms::_empty);
      doc.AddToDocumentNameTable(this, id);
    }
    if (ShouldExposeNameAsHTMLDocumentProperty(this)) {
      nsAtom* name = GetParsedAttr(nsGkAtoms::name)->GetAtomValue();
      MOZ_ASSERT(name && name != nsGkAtoms::_empty);
      // Make sure not to double-add if id and name are the same.
      if (id != name) {
        doc.AddToDocumentNameTable(this, name);
      }
    }
  }

  if (HasFlag(NODE_IS_EDITABLE) &&
      (HasContentEditableAttrTrueOrPlainTextOnly() ||
       HasFlag(ELEMENT_HAS_EDIT_CONTEXT)) &&
      IsInComposedDoc()) {
    aContext.OwnerDoc().ChangeContentEditableCount(this, +1);
  }

  // Hide any nonce from the DOM, but keep the internal value of the
  // nonce by copying and resetting the internal nonce value.
  if (!aContext.IsMove() && HasFlag(NODE_HAS_NONCE_AND_HEADER_CSP) &&
      IsInComposedDoc() && OwnerDoc()->GetBrowsingContext()) {
    nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
        "nsGenericHTMLElement::ResetNonce::Runnable",
        [self = RefPtr<nsGenericHTMLElement>(this)]() {
          nsAutoString nonce;
          self->GetNonce(nonce);
          self->SetAttr(kNameSpaceID_None, nsGkAtoms::nonce, u""_ns, true);
          self->SetNonce(nonce);
        }));
  }

  // We need to consider a labels element is moved to another subtree
  // with different root, it needs to update labels list and its root
  // as well.
  nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots();
  if (slots && slots->mLabelsList) {
    slots->mLabelsList->ResetRoots();
  }

  return rv;
}

void nsGenericHTMLElement::UnbindFromTree(UnbindContext& aContext) {
  if (IsInComposedDoc()) {
    // https://html.spec.whatwg.org/#dom-trees:hide-popover-algorithm
    // If removedNode's popover attribute is not in the no popover state, then
    // run the hide popover algorithm given removedNode, false, false, and
    // false.
    if (!aContext.IsMove() && GetPopoverData()) {
      HidePopoverWithoutRunningScript();
    }
    RegUnRegAccessKey(false);
  }

  RemoveFromNameTable();

  if (Document* doc = GetUncomposedDoc()) {
    nsAtom* id = nullptr;
    if (ShouldExposeIdAsHTMLDocumentProperty(this)) {
      id = DoGetID();
      MOZ_ASSERT(id && id != nsGkAtoms::_empty);
      doc->RemoveFromDocumentNameTable(this, id);
    }
    if (ShouldExposeNameAsHTMLDocumentProperty(this)) {
      nsAtom* name = GetParsedAttr(nsGkAtoms::name)->GetAtomValue();
      MOZ_ASSERT(name && name != nsGkAtoms::_empty);
      // Make sure not to double-remove if id and name are the same.
      if (id != name) {
        doc->RemoveFromDocumentNameTable(this, name);
      }
    }
  }

  if (HasContentEditableAttrTrueOrPlainTextOnly() ||
      HasFlag(ELEMENT_HAS_EDIT_CONTEXT)) {
    if (Document* doc = GetComposedDoc()) {
      doc->ChangeContentEditableCount(this, -1);
    }
  }

  nsStyledElement::UnbindFromTree(aContext);

  // Invalidate .labels list. It will be repopulated when used the next time.
  nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots();
  if (slots && slots->mLabelsList) {
    slots->mLabelsList->ResetRoots();
  }
}

HTMLFormElement* nsGenericHTMLElement::FindAncestorForm(
    HTMLFormElement* aCurrentForm) {
  NS_ASSERTION(!HasAttr(nsGkAtoms::form) || IsHTMLElement(nsGkAtoms::img),
               "FindAncestorForm should not be called if @form is set!");
  if (IsInNativeAnonymousSubtree()) {
    return nullptr;
  }

  nsIContent* content = this;
  while (content) {
    // If the current ancestor is a form, return it as our form
    if (content->IsHTMLElement(nsGkAtoms::form)) {
#ifdef DEBUG
      if (!nsContentUtils::IsInSameAnonymousTree(this, content)) {
        // It's possible that we started unbinding at |content| or
        // some ancestor of it, and |content| and |this| used to all be
        // anonymous.  Check for this the hard way.
        for (nsIContent* child = this; child != content;
             child = child->GetParent()) {
          NS_ASSERTION(child->ComputeIndexInParentContent().isSome(),
                       "Walked too far?");
        }
      }
#endif
      return static_cast<HTMLFormElement*>(content);
    }

    nsIContent* prevContent = content;
    content = prevContent->GetParent();

    if (!content && aCurrentForm) {
      // We got to the root of the subtree we're in, and we're being removed
      // from the DOM (the only time we get into this method with a non-null
      // aCurrentForm).  Check whether aCurrentForm is in the same subtree.  If
      // it is, we want to return aCurrentForm, since this case means that
      // we're one of those inputs-in-a-table that have a hacked mForm pointer
      // and a subtree containing both us and the form got removed from the
      // DOM.
      if (aCurrentForm->IsInclusiveDescendantOf(prevContent)) {
        return aCurrentForm;
      }
    }
  }

  return nullptr;
}

bool nsGenericHTMLElement::CheckHandleEventForAnchorsPreconditions(
    EventChainVisitor& aVisitor) {
  MOZ_ASSERT(nsCOMPtr<Link>(do_QueryObject(this)),
             "should be called only when |this| implements |Link|");
  // When disconnected, only <a> should navigate away per
  // https://html.spec.whatwg.org/#cannot-navigate
  return IsInComposedDoc() || IsHTMLElement(nsGkAtoms::a);
}

void nsGenericHTMLElement::GetEventTargetParentForAnchors(
    EventChainPreVisitor& aVisitor) {
  nsGenericHTMLElementBase::GetEventTargetParent(aVisitor);

  if (!CheckHandleEventForAnchorsPreconditions(aVisitor)) {
    return;
  }

  GetEventTargetParentForLinks(aVisitor);
}

nsresult nsGenericHTMLElement::PostHandleEventForAnchors(
    EventChainPostVisitor& aVisitor) {
  if (!CheckHandleEventForAnchorsPreconditions(aVisitor)) {
    return NS_OK;
  }

  return PostHandleEventForLinks(aVisitor);
}

bool nsGenericHTMLElement::IsHTMLLink(nsIURI** aURI) const {
  MOZ_ASSERT(aURI, "Must provide aURI out param");

  *aURI = GetHrefURIForAnchors().take();
  // We promise out param is non-null if we return true, so base rv on it
  return *aURI != nullptr;
}

already_AddRefed<nsIURI> nsGenericHTMLElement::GetHrefURIForAnchors() const {
  // This is used by the three Link implementations and
  // nsHTMLStyleElement.

  // Get href= attribute (relative URI).

  // We use the nsAttrValue's copy of the URI string to avoid copying.
  nsCOMPtr<nsIURI> uri;
  GetURIAttr(nsGkAtoms::href, nullptr, getter_AddRefs(uri));
  return uri.forget();
}

void nsGenericHTMLElement::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
                                         const nsAttrValue* aValue,
                                         bool aNotify) {
  if (aNamespaceID == kNameSpaceID_None) {
    if (aName == nsGkAtoms::accesskey) {
      // Have to unregister before clearing flag. See UnregAccessKey
      RegUnRegAccessKey(false);
      if (!aValue) {
        UnsetFlags(NODE_HAS_ACCESSKEY);
      }
    } else if (aName == nsGkAtoms::name) {
      // Have to do this before clearing flag. See RemoveFromNameTable
      RemoveFromNameTable();

      nsAtom* exposedIdOnDocument = nullptr;
      Document* doc = GetUncomposedDoc();
      if (doc) {
        nsAtom* exposedNameOnDocument =
            ShouldExposeNameAsHTMLDocumentProperty(this)
                ? GetParsedAttr(nsGkAtoms::name)->GetAtomValue()
                : nullptr;
        exposedIdOnDocument =
            ShouldExposeIdAsHTMLDocumentProperty(this) ? DoGetID() : nullptr;
        if (exposedNameOnDocument &&
            exposedNameOnDocument != exposedIdOnDocument) {
          MOZ_ASSERT(exposedNameOnDocument != nsGkAtoms::_empty);
          doc->RemoveFromDocumentNameTable(this, exposedNameOnDocument);
        }
      }
      if (!aValue || aValue->IsEmptyString()) {
        ClearHasName();
        // The result of ShouldExposeIdAsHTMLDocumentProperty() might change
        // after clearing the hasName flag.
        if (doc && exposedIdOnDocument &&
            !ShouldExposeIdAsHTMLDocumentProperty(this)) {
          doc->RemoveFromDocumentNameTable(this, exposedIdOnDocument);
        }
      }
    } else if (aName == nsGkAtoms::id) {
      if (Document* doc = GetUncomposedDoc()) {
        nsAtom* exposedIdOnDocument =
            ShouldExposeIdAsHTMLDocumentProperty(this) ? DoGetID() : nullptr;
        nsAtom* exposedNameOnDocument =
            ShouldExposeNameAsHTMLDocumentProperty(this)
                ? GetParsedAttr(nsGkAtoms::name)->GetAtomValue()
                : nullptr;
        if (exposedIdOnDocument &&
            exposedIdOnDocument != exposedNameOnDocument) {
          doc->RemoveFromDocumentNameTable(this, exposedIdOnDocument);
        }
      }
    } else if (aName == nsGkAtoms::contenteditable) {
      if (aValue) {
        // Set this before the attribute is set so that any subclass code that
        // runs before the attribute is set won't think we're missing a
        // contenteditable attr when we actually have one.
        SetMayHaveContentEditableAttr();
      }
    }
    if (!aValue && IsEventAttributeName(aName)) {
      if (EventListenerManager* manager = GetExistingListenerManager()) {
        manager->RemoveEventHandler(GetEventNameForAttr(aName));
      }
    }
  }

  return nsGenericHTMLElementBase::BeforeSetAttr(aNamespaceID, aName, aValue,
                                                 aNotify);
}

namespace {
constexpr PopoverAttributeState ToPopoverAttributeState(
    PopoverAttributeKeyword aPopoverAttributeKeyword) {
  // See <https://html.spec.whatwg.org/#the-popover-attribute>.
  switch (aPopoverAttributeKeyword) {
    case PopoverAttributeKeyword::Auto:
      return PopoverAttributeState::Auto;
    case PopoverAttributeKeyword::Hint:
      if (!StaticPrefs::dom_element_popoverhint_enabled()) {
        return PopoverAttributeState::Manual;
      }
      return PopoverAttributeState::Hint;
    case PopoverAttributeKeyword::EmptyString:
      return PopoverAttributeState::Auto;
    case PopoverAttributeKeyword::Manual:
      return PopoverAttributeState::Manual;
    default: {
      MOZ_ASSERT_UNREACHABLE();
      return PopoverAttributeState::None;
    }
  }
}
}  // namespace

void nsGenericHTMLElement::AfterSetPopoverAttr() {
  auto mapPopoverState = [](const nsAttrValue* value) -> PopoverAttributeState {
    if (value) {
      MOZ_ASSERT(value->Type() == nsAttrValue::eEnum);
      const auto popoverAttributeKeyword =
          static_cast<PopoverAttributeKeyword>(value->GetEnumValue());
      return ToPopoverAttributeState(popoverAttributeKeyword);
    }

    // The missing value default is the no popover state, see
    // <https://html.spec.whatwg.org/multipage/popover.html#attr-popover>.
    return PopoverAttributeState::None;
  };

  PopoverAttributeState newState =
      mapPopoverState(GetParsedAttr(nsGkAtoms::popover));

  if (!StaticPrefs::dom_element_popoverhint_enabled() &&
      newState == PopoverAttributeState::Hint) {
    newState = PopoverAttributeState::Manual;
  }

  const PopoverAttributeState oldState = GetPopoverAttributeState();

  if (newState != oldState) {
    PopoverPseudoStateUpdate(false, true);

    if (IsPopoverOpen()) {
      HidePopoverInternal(/* aFocusPreviousElement = */ true,
                          /* aFireEvents = */ true, /* aSource*/ nullptr,
                          IgnoreErrors());
      // Event handlers could have removed the popover attribute, or changed
      // its value.
      // https://github.com/whatwg/html/issues/9034
      newState = mapPopoverState(GetParsedAttr(nsGkAtoms::popover));
    }

    if (newState == PopoverAttributeState::None) {
      auto* popoverData = GetPopoverData();
      if (popoverData) {
        // We have to keep track of the toggle event task, if, for example,
        // the popover attribute is removed as part of the popover focusing
        // steps in https://html.spec.whatwg.org/#show-popover. So we can't
        // clear the popover data in that case.
        if (popoverData->IsPopoverHiding() || OwnerDoc()->IsShowingPopover()) {
          popoverData->SetPopoverAttributeState(newState);
        } else {
          ClearPopoverData();
        }
      }
      RemoveStates(ElementState::POPOVER_OPEN);
    } else {
      // Re-apply the state in case event handlers changed it
      EnsurePopoverData().SetPopoverAttributeState(newState);
      if (IsPopoverOpen()) {
        PopoverPseudoStateUpdate(true, true);
      }
    }
  }
}

void nsGenericHTMLElement::OnAttrSetButNotChanged(
    int32_t aNamespaceID, nsAtom* aName, const nsAttrValueOrString& aValue,
    bool aNotify) {
  if (aNamespaceID == kNameSpaceID_None && aName == nsGkAtoms::popovertarget) {
    ClearExplicitlySetAttrElement(aName);
  }
  return nsGenericHTMLElementBase::OnAttrSetButNotChanged(aNamespaceID, aName,
                                                          aValue, aNotify);
}

void nsGenericHTMLElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
                                        const nsAttrValue* aValue,
                                        const nsAttrValue* aOldValue,
                                        nsIPrincipal* aMaybeScriptedPrincipal,
                                        bool aNotify) {
  if (aNamespaceID == kNameSpaceID_None) {
    if (IsEventAttributeName(aName) && aValue) {
      MOZ_ASSERT(aValue->Type() == nsAttrValue::eString ||
                     aValue->Type() == nsAttrValue::eAtom,
                 "Expected string or atom value for script body");
      SetEventHandler(GetEventNameForAttr(aName),
                      nsAttrValueOrString(aValue).String());
    } else if (aNotify && aName == nsGkAtoms::spellcheck) {
      SyncEditorsOnSubtree(this);
    } else if (aName == nsGkAtoms::popover) {
      nsContentUtils::AddScriptRunner(
          NewRunnableMethod("nsGenericHTMLElement::AfterSetPopoverAttr", this,
                            &nsGenericHTMLElement::AfterSetPopoverAttr));
    } else if (aName == nsGkAtoms::popovertarget) {
      ClearExplicitlySetAttrElement(aName);
    } else if (aName == nsGkAtoms::dir) {
      auto dir = Directionality::Ltr;
      // A boolean tracking whether we need to recompute our directionality.
      // This needs to happen after we update our internal "dir" attribute
      // state but before we call SetDirectionalityOnDescendants.
      bool recomputeDirectionality = false;
      ElementState dirStates;
      if (aValue && aValue->Type() == nsAttrValue::eEnum) {
        SetHasValidDir();
        dirStates |= ElementState::HAS_DIR_ATTR;
        auto dirValue = Directionality(aValue->GetEnumValue());
        if (dirValue == Directionality::Auto) {
          dirStates |= ElementState::HAS_DIR_ATTR_LIKE_AUTO;
        } else {
          dir = dirValue;
          SetDirectionality(dir, aNotify);
          if (dirValue == Directionality::Ltr) {
            dirStates |= ElementState::HAS_DIR_ATTR_LTR;
          } else {
            MOZ_ASSERT(dirValue == Directionality::Rtl);
            dirStates |= ElementState::HAS_DIR_ATTR_RTL;
          }
        }
      } else {
        if (aValue) {
          // We have a value, just not a valid one.
          dirStates |= ElementState::HAS_DIR_ATTR;
        }
        ClearHasValidDir();
        if (NodeInfo()->Equals(nsGkAtoms::bdi)) {
          dirStates |= ElementState::HAS_DIR_ATTR_LIKE_AUTO;
        } else {
          recomputeDirectionality = true;
        }
      }
      // Now figure out what's changed about our dir states.
      ElementState oldDirStates = State() & ElementState::DIR_ATTR_STATES;
      ElementState changedStates = dirStates ^ oldDirStates;
      if (!changedStates.IsEmpty()) {
        ToggleStates(changedStates, aNotify);
      }
      if (recomputeDirectionality) {
        dir = RecomputeDirectionality(this, aNotify);
      }
      SetDirectionalityOnDescendants(this, dir, aNotify);
    } else if (aName == nsGkAtoms::contenteditable) {
      const auto IsEditableExceptInherit = [](const nsAttrValue& aValue) {
        return aValue.Equals(EmptyString(), eCaseMatters) ||
               aValue.Equals(u"true"_ns, eIgnoreCase) ||
               aValue.Equals(u"plaintext-only"_ns, eIgnoreCase);
      };
      // FYI: Now, both HasContentEditableAttrTrueOrPlainTextOnly() and
      // HasContentEditableAttrFalse() return true.  Therefore, we need to clear
      // one of them or both of them.
      int32_t editableCountDelta = 0;
      if (aOldValue && IsEditableExceptInherit(*aOldValue)) {
        editableCountDelta = -1;
        ClearHasContentEditableAttrTrueOrPlainTextOnly();
      }
      if (!aValue) {
        ClearMayHaveContentEditableAttr();
      } else if (IsEditableExceptInherit(*aValue)) {
        ++editableCountDelta;
        SetHasContentEditableAttrTrueOrPlainTextOnly();
      }
      ChangeEditableState(editableCountDelta);
    } else if (aName == nsGkAtoms::accesskey) {
      if (aValue && !aValue->IsEmptyString()) {
        SetFlags(NODE_HAS_ACCESSKEY);
        RegUnRegAccessKey(true);
      }
    } else if (aName == nsGkAtoms::inert) {
      if (aValue) {
        AddStates(ElementState::INERT);
      } else {
        RemoveStates(ElementState::INERT);
      }
    } else if (aName == nsGkAtoms::name) {
      if (aValue && !aValue->IsEmptyString()) {
        SetHasName();
        if (CanHaveName(NodeInfo()->NameAtom())) {
          AddToNameTable(aValue->GetAtomValue());
        }
        if (Document* doc = GetUncomposedDoc()) {
          if (ShouldExposeNameAsHTMLDocumentProperty(this)) {
            nsAtom* id = ShouldExposeIdAsHTMLDocumentProperty(this) ? DoGetID()
                                                                    : nullptr;
            nsAtom* name = aValue->GetAtomValue();
            // Make sure not to double-add if id and name are the same
            if (id != name) {
              doc->AddToDocumentNameTable(this, name);
            }
          }
        }
      }
    } else if (aName == nsGkAtoms::id) {
      if (Document* doc = GetUncomposedDoc()) {
        if (aValue && ShouldExposeIdAsHTMLDocumentProperty(this)) {
          nsAtom* id = aValue->GetAtomValue();
          nsAtom* name = ShouldExposeNameAsHTMLDocumentProperty(this)
                             ? GetParsedAttr(nsGkAtoms::name)->GetAtomValue()
                             : nullptr;
          if (id != name) {
            doc->AddToDocumentNameTable(this, id);
          }
        }
      }
    } else if (aName == nsGkAtoms::inputmode ||
               aName == nsGkAtoms::enterkeyhint) {
      if (nsFocusManager::GetFocusedElementStatic() == this) {
        if (const nsPresContext* presContext =
                GetPresContext(eForComposedDoc)) {
          IMEContentObserver* observer =
              IMEStateManager::GetActiveContentObserver();
          if (observer && observer->IsObserving(*presContext, this)) {
            if (const RefPtr<EditorBase> editorBase = GetExtantEditor()) {
              // If the TextControlState does not have a bound frame,
              // TextEditor::GetPreferredIMEState() may fail.  In such case,
              // TextEditor will update IME state when it's (re)initialized
              // later.
              Result<IMEState, nsresult> newStateOrError =
                  editorBase->GetPreferredIMEState();
              if (MOZ_LIKELY(newStateOrError.isOk())) {
                OwningNonNull<nsGenericHTMLElement> kungFuDeathGrip(*this);
                IMEStateManager::UpdateIMEState(
                    newStateOrError.unwrap(), kungFuDeathGrip, *editorBase,
                    {IMEStateManager::UpdateIMEStateOption::ForceUpdate,
                     IMEStateManager::UpdateIMEStateOption::
                         DontCommitComposition});
              }
            }
          }
        }
      }
    } else if (aName == nsGkAtoms::headingreset ||
               aName == nsGkAtoms::headingoffset) {
      if (StaticPrefs::dom_headingoffset_enabled()) {
        UpdateHeadingElementsOffsetChange();
      }
    }

    // The nonce will be copied over to an internal slot and cleared from the
    // Element within BindToTree to avoid CSS Selector nonce exfiltration if
    // the CSP list contains a header-delivered CSP.
    if (nsGkAtoms::nonce == aName) {
      if (aValue) {
        SetNonce(nsAttrValueOrString(aValue).String());
        if (OwnerDoc()->GetHasCSPDeliveredThroughHeader()) {
          SetFlags(NODE_HAS_NONCE_AND_HEADER_CSP);
        }
      } else {
        RemoveNonce();
      }
    }
  }

  return nsGenericHTMLElementBase::AfterSetAttr(
      aNamespaceID, aName, aValue, aOldValue, aMaybeScriptedPrincipal, aNotify);
}

EventListenerManager* nsGenericHTMLElement::GetEventListenerManagerForAttr(
    nsAtom* aAttrName, bool* aDefer) {
  // Attributes on the body and frameset tags get set on the global object
  if ((mNodeInfo->Equals(nsGkAtoms::body) ||
       mNodeInfo->Equals(nsGkAtoms::frameset)) &&
      // We only forward some event attributes from body/frameset to window
      (false
#define EVENT(name_, id_, type_, struct_) /* nothing */
#define FORWARDED_EVENT(name_, id_, type_, struct_) \
  || nsGkAtoms::on##name_ == aAttrName
#define WINDOW_EVENT FORWARDED_EVENT
#include "mozilla/EventNameList.inc"  // IWYU pragma: keep
#undef WINDOW_EVENT
#undef FORWARDED_EVENT
#undef EVENT
       )) {
    nsPIDOMWindowInner* win;

    // If we have a document, and it has a window, add the event
    // listener on the window (the inner window). If not, proceed as
    // normal.
    // XXXbz sXBL/XBL2 issue: should we instead use GetComposedDoc() here,
    // override BindToTree for those classes and munge event listeners there?
    Document* document = OwnerDoc();

    *aDefer = false;
    if ((win = document->GetInnerWindow())) {
      nsCOMPtr<EventTarget> piTarget(do_QueryInterface(win));

      return piTarget->GetOrCreateListenerManager();
    }

    return nullptr;
  }

  return nsGenericHTMLElementBase::GetEventListenerManagerForAttr(aAttrName,
                                                                  aDefer);
}

#define EVENT(name_, id_, type_, struct_) /* nothing; handled by nsINode */
#define FORWARDED_EVENT(name_, id_, type_, struct_)                       \
  EventHandlerNonNull* nsGenericHTMLElement::GetOn##name_() {             \
    if (IsAnyOfHTMLElements(nsGkAtoms::body, nsGkAtoms::frameset)) {      \
      /* XXXbz note to self: add tests for this! */                       \
      if (nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow()) {       \
        nsGlobalWindowInner* globalWin = nsGlobalWindowInner::Cast(win);  \
        return globalWin->GetOn##name_();                                 \
      }                                                                   \
      return nullptr;                                                     \
    }                                                                     \
                                                                          \
    return nsINode::GetOn##name_();                                       \
  }                                                                       \
  void nsGenericHTMLElement::SetOn##name_(EventHandlerNonNull* handler) { \
    if (IsAnyOfHTMLElements(nsGkAtoms::body, nsGkAtoms::frameset)) {      \
      nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow();             \
      if (!win) {                                                         \
        return;                                                           \
      }                                                                   \
                                                                          \
      nsGlobalWindowInner* globalWin = nsGlobalWindowInner::Cast(win);    \
      return globalWin->SetOn##name_(handler);                            \
    }                                                                     \
                                                                          \
    return nsINode::SetOn##name_(handler);                                \
  }
#define ERROR_EVENT(name_, id_, type_, struct_)                                \
  already_AddRefed<EventHandlerNonNull> nsGenericHTMLElement::GetOn##name_() { \
    if (IsAnyOfHTMLElements(nsGkAtoms::body, nsGkAtoms::frameset)) {           \
      /* XXXbz note to self: add tests for this! */                            \
      if (nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow()) {            \
        nsGlobalWindowInner* globalWin = nsGlobalWindowInner::Cast(win);       \
        OnErrorEventHandlerNonNull* errorHandler = globalWin->GetOn##name_();  \
        if (errorHandler) {                                                    \
          RefPtr<EventHandlerNonNull> handler =                                \
              new EventHandlerNonNull(errorHandler);                           \
          return handler.forget();                                             \
        }                                                                      \
      }                                                                        \
      return nullptr;                                                          \
    }                                                                          \
                                                                               \
    RefPtr<EventHandlerNonNull> handler = nsINode::GetOn##name_();             \
    return handler.forget();                                                   \
  }                                                                            \
  void nsGenericHTMLElement::SetOn##name_(EventHandlerNonNull* handler) {      \
    if (IsAnyOfHTMLElements(nsGkAtoms::body, nsGkAtoms::frameset)) {           \
      nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow();                  \
      if (!win) {                                                              \
        return;                                                                \
      }                                                                        \
                                                                               \
      nsGlobalWindowInner* globalWin = nsGlobalWindowInner::Cast(win);         \
      RefPtr<OnErrorEventHandlerNonNull> errorHandler;                         \
      if (handler) {                                                           \
        errorHandler = new OnErrorEventHandlerNonNull(handler);                \
      }                                                                        \
      return globalWin->SetOn##name_(errorHandler);                            \
    }                                                                          \
                                                                               \
    return nsINode::SetOn##name_(handler);                                     \
  }
#include "mozilla/EventNameList.inc"  // IWYU pragma: keep
#undef ERROR_EVENT
#undef FORWARDED_EVENT
#undef EVENT

void nsGenericHTMLElement::GetBaseTarget(nsAString& aBaseTarget) const {
  OwnerDoc()->GetBaseTarget(aBaseTarget);
}

//----------------------------------------------------------------------

bool nsGenericHTMLElement::ParseAttribute(int32_t aNamespaceID,
                                          nsAtom* aAttribute,
                                          const nsAString& aValue,
                                          nsIPrincipal* aMaybeScriptedPrincipal,
                                          nsAttrValue& aResult) {
  if (aNamespaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::dir) {
      return aResult.ParseEnumValue(aValue, kDirTable, false);
    }

    if (aAttribute == nsGkAtoms::popover) {
      return aResult.ParseEnumValue(aValue, kPopoverTable, false,
                                    kPopoverTableInvalidValueDefault);
    }

    if (aAttribute == nsGkAtoms::tabindex) {
      return aResult.ParseIntValue(aValue);
    }

    if (aAttribute == nsGkAtoms::referrerpolicy) {
      return ParseReferrerAttribute(aValue, aResult);
    }

    if (aAttribute == nsGkAtoms::name) {
      // Store name as an atom.  name="" means that the element has no name,
      // not that it has an empty string as the name.
      if (aValue.IsEmpty()) {
        return false;
      }
      aResult.ParseAtom(aValue);
      return true;
    }

    if (aAttribute == nsGkAtoms::contenteditable ||
        aAttribute == nsGkAtoms::translate) {
      aResult.ParseAtom(aValue);
      return true;
    }

    if (aAttribute == nsGkAtoms::rel) {
      aResult.ParseAtomArray(aValue);
      return true;
    }

    if (aAttribute == nsGkAtoms::inputmode) {
      return aResult.ParseEnumValue(aValue, kInputmodeTable, false);
    }

    if (aAttribute == nsGkAtoms::enterkeyhint) {
      return aResult.ParseEnumValue(aValue, kEnterKeyHintTable, false);
    }

    if (aAttribute == nsGkAtoms::autocapitalize) {
      return aResult.ParseEnumValue(aValue, kAutocapitalizeTable, false);
    }

    if (StaticPrefs::dom_headingoffset_enabled()) {
      if (aAttribute == nsGkAtoms::headingoffset) {
        aResult.ParseNonNegativeIntValue(aValue);
        return true;
      }
    }
  }

  return nsGenericHTMLElementBase::ParseAttribute(
      aNamespaceID, aAttribute, aValue, aMaybeScriptedPrincipal, aResult);
}

bool nsGenericHTMLElement::ParseBackgroundAttribute(int32_t aNamespaceID,
                                                    nsAtom* aAttribute,
                                                    const nsAString& aValue,
                                                    nsAttrValue& aResult) {
  if (aNamespaceID == kNameSpaceID_None &&
      aAttribute == nsGkAtoms::background && !aValue.IsEmpty()) {
    // Resolve url to an absolute url
    Document* doc = OwnerDoc();
    nsCOMPtr<nsIURI> uri;
    nsresult rv = nsContentUtils::NewURIWithDocumentCharset(
        getter_AddRefs(uri), aValue, doc, GetBaseURI());
    if (NS_FAILED(rv)) {
      return false;
    }
    aResult.SetTo(uri, &aValue);
    return true;
  }

  return false;
}

bool nsGenericHTMLElement::IsAttributeMapped(const nsAtom* aAttribute) const {
  static const MappedAttributeEntry* const map[] = {sCommonAttributeMap};

  return FindAttributeDependence(aAttribute, map);
}

nsMapRuleToAttributesFunc nsGenericHTMLElement::GetAttributeMappingFunction()
    const {
  return &MapCommonAttributesInto;
}

// Represents a possible value for the "align" attribute. Different
// elements may support different subsets of these values and map
// them into different CSS properties.
enum class HTMLAlignValue : uint8_t {
  Left,
  Right,
  Top,
  Middle,
  Bottom,
  Center,
  Baseline,
  TextTop,
  AbsMiddle,
  AbsCenter,
  AbsBottom,
  Justify,
};

// clang-format off
static constexpr nsAttrValue::EnumTableEntry kDivAlignTable[] = {
    {"left", HTMLAlignValue::Left},
    {"right", HTMLAlignValue::Right},
    {"center", HTMLAlignValue::Center},
    {"middle", HTMLAlignValue::Middle},
    {"justify", HTMLAlignValue::Justify},
};
// clang-format on

static constexpr nsAttrValue::EnumTableEntry kFrameborderTable[] = {
    {"yes", FrameBorderProperty::Yes},
    {"no", FrameBorderProperty::No},
    {"1", FrameBorderProperty::One},
    {"0", FrameBorderProperty::Zero},
};

// TODO(emilio): Nobody uses the parsed attribute here.
static constexpr nsAttrValue::EnumTableEntry kScrollingTable[] = {
    {"yes", ScrollingAttribute::Yes},
    {"no", ScrollingAttribute::No},
    {"on", ScrollingAttribute::On},
    {"off", ScrollingAttribute::Off},
    {"scroll", ScrollingAttribute::Scroll},
    {"noscroll", ScrollingAttribute::Noscroll},
    {"auto", ScrollingAttribute::Auto},
};

static constexpr nsAttrValue::EnumTableEntry kTableVAlignTable[] = {
    {"top", TableCellAlignment::Top},
    {"middle", TableCellAlignment::Middle},
    {"bottom", TableCellAlignment::Bottom},
    {"baseline", TableCellAlignment::Baseline},
};

static constexpr nsAttrValue::EnumTableEntry kAlignTable[] = {
    {"left", HTMLAlignValue::Left},
    {"right", HTMLAlignValue::Right},
    {"top", HTMLAlignValue::Top},
    {"middle", HTMLAlignValue::Middle},
    {"bottom", HTMLAlignValue::Bottom},
    {"center", HTMLAlignValue::Center},
    {"baseline", HTMLAlignValue::Baseline},
    {"texttop", HTMLAlignValue::TextTop},
    {"absmiddle", HTMLAlignValue::AbsMiddle},
    {"abscenter", HTMLAlignValue::AbsCenter},
    {"absbottom", HTMLAlignValue::AbsBottom},
};

bool nsGenericHTMLElement::ParseAlignValue(const nsAString& aString,
                                           nsAttrValue& aResult) {
  return aResult.ParseEnumValue(aString, kAlignTable, false);
}

//----------------------------------------

static constexpr nsAttrValue::EnumTableEntry kTableHAlignTable[] = {
    {"left", HTMLAlignValue::Left},
    {"right", HTMLAlignValue::Right},
    {"center", HTMLAlignValue::Center},
};

bool nsGenericHTMLElement::ParseTableHAlignValue(const nsAString& aString,
                                                 nsAttrValue& aResult) {
  return aResult.ParseEnumValue(aString, kTableHAlignTable, false);
}

//----------------------------------------

// This table is used for td, th, tr, col, thead, tbody and tfoot.
static constexpr nsAttrValue::EnumTableEntry kTableCellHAlignTable[] = {
    {"left", HTMLAlignValue::Left},
    {"right", HTMLAlignValue::Right},
    {"center", HTMLAlignValue::Center},
    {"justify", HTMLAlignValue::Justify},
    {"middle", HTMLAlignValue::Middle},
    {"absmiddle", HTMLAlignValue::AbsMiddle},
};

bool nsGenericHTMLElement::ParseTableCellHAlignValue(const nsAString& aString,
                                                     nsAttrValue& aResult) {
  return aResult.ParseEnumValue(aString, kTableCellHAlignTable, false);
}

//----------------------------------------

bool nsGenericHTMLElement::ParseTableVAlignValue(const nsAString& aString,
                                                 nsAttrValue& aResult) {
  return aResult.ParseEnumValue(aString, kTableVAlignTable, false);
}

bool nsGenericHTMLElement::ParseDivAlignValue(const nsAString& aString,
                                              nsAttrValue& aResult) {
  return aResult.ParseEnumValue(aString, kDivAlignTable, false);
}

bool nsGenericHTMLElement::ParseImageAttribute(nsAtom* aAttribute,
                                               const nsAString& aString,
                                               nsAttrValue& aResult) {
  if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height ||
      aAttribute == nsGkAtoms::hspace || aAttribute == nsGkAtoms::vspace) {
    return aResult.ParseHTMLDimension(aString);
  }
  if (aAttribute == nsGkAtoms::border) {
    return aResult.ParseNonNegativeIntValue(aString);
  }
  return false;
}

static constexpr nsAttrValue::EnumTableEntry kReferrerPolicyTable[] = {
    {GetEnumString(ReferrerPolicy::No_referrer).get(),
     static_cast<int16_t>(ReferrerPolicy::No_referrer)},
    {GetEnumString(ReferrerPolicy::Origin).get(),
     static_cast<int16_t>(ReferrerPolicy::Origin)},
    {GetEnumString(ReferrerPolicy::Origin_when_cross_origin).get(),
     static_cast<int16_t>(ReferrerPolicy::Origin_when_cross_origin)},
    {GetEnumString(ReferrerPolicy::No_referrer_when_downgrade).get(),
     static_cast<int16_t>(ReferrerPolicy::No_referrer_when_downgrade)},
    {GetEnumString(ReferrerPolicy::Unsafe_url).get(),
     static_cast<int16_t>(ReferrerPolicy::Unsafe_url)},
    {GetEnumString(ReferrerPolicy::Strict_origin).get(),
     static_cast<int16_t>(ReferrerPolicy::Strict_origin)},
    {GetEnumString(ReferrerPolicy::Same_origin).get(),
     static_cast<int16_t>(ReferrerPolicy::Same_origin)},
    {GetEnumString(ReferrerPolicy::Strict_origin_when_cross_origin).get(),
     static_cast<int16_t>(ReferrerPolicy::Strict_origin_when_cross_origin)},
};

bool nsGenericHTMLElement::ParseReferrerAttribute(const nsAString& aString,
                                                  nsAttrValue& aResult) {
  using mozilla::dom::ReferrerInfo;
  return aResult.ParseEnumValue(aString, kReferrerPolicyTable, false);
}

bool nsGenericHTMLElement::ParseFrameborderValue(const nsAString& aString,
                                                 nsAttrValue& aResult) {
  return aResult.ParseEnumValue(aString, kFrameborderTable, false);
}

bool nsGenericHTMLElement::ParseScrollingValue(const nsAString& aString,
                                               nsAttrValue& aResult) {
  return aResult.ParseEnumValue(aString, kScrollingTable, false);
}

static inline void MapLangAttributeInto(MappedDeclarationsBuilder& aBuilder) {
  const nsAttrValue* langValue = aBuilder.GetAttr(nsGkAtoms::lang);
  if (!langValue) {
    return;
  }
  MOZ_ASSERT(langValue->Type() == nsAttrValue::eAtom);

  // Adaptor for nsCString to expose the Buffer interface to Locale::ToString.
  class BufferAdaptor {
   public:
    using CharType = char;

    explicit BufferAdaptor(nsCString& aString) : mString(aString) {}
    CharType* data() { return mString.BeginWriting(); }
    size_t capacity() const { return mString.Length(); }
    bool reserve(size_t aLen) { return mString.SetLength(aLen, fallible); }
    void written(size_t aLen) { mString.SetLength(aLen); }

   private:
    nsCString& mString;
  };

  // Try parsing lang as a Locale and canonicalizing the subtags; if parsing
  // succeeds, we record the canonicalized version rather than the original,
  // so that code checking for particular codes can assume canonical casing.
  // Note that in some cases this will also map 3-character ISO 639-3 tags to
  // their corresponding 2-char ISO 639-1 tags.
  RefPtr<nsAtom> lang = langValue->GetAtomValue();
  nsAtomCString langStr(lang);
  intl::Locale loc;
  if (intl::LocaleParser::TryParse(langStr, loc).isOk() &&
      loc.Canonicalize().isOk()) {
    nsAutoCString canonical;
    BufferAdaptor buffer(canonical);
    if (loc.ToString(buffer).isOk() && canonical != langStr) {
      lang = NS_Atomize(canonical);
    }
  }

  aBuilder.SetIdentAtomValueIfUnset(eCSSProperty__x_lang, lang);
  if (!aBuilder.PropertyIsSet(eCSSProperty_text_emphasis_position)) {
    if (nsStyleUtil::MatchesLanguagePrefix(lang, u"zh")) {
      aBuilder.SetKeywordValue(eCSSProperty_text_emphasis_position,
                               StyleTextEmphasisPosition::UNDER._0);
    } else if (nsStyleUtil::MatchesLanguagePrefix(lang, u"ja") ||
               nsStyleUtil::MatchesLanguagePrefix(lang, u"mn")) {
      // This branch is currently no part of the spec.
      // See bug 1040668 comment 69 and comment 75.
      aBuilder.SetKeywordValue(eCSSProperty_text_emphasis_position,
                               StyleTextEmphasisPosition::OVER._0);
    }
  }
}

/**
 * Handle attributes common to all html elements
 */
void nsGenericHTMLElement::MapCommonAttributesIntoExceptHidden(
    MappedDeclarationsBuilder& aBuilder) {
  MapLangAttributeInto(aBuilder);
}

void nsGenericHTMLElement::MapCommonAttributesInto(
    MappedDeclarationsBuilder& aBuilder) {
  MapCommonAttributesIntoExceptHidden(aBuilder);
  MOZ_ASSERT(!aBuilder.PropertyIsSet(eCSSProperty_display));
  MOZ_ASSERT(!aBuilder.PropertyIsSet(eCSSProperty_content_visibility));

  if (const nsAttrValue* hidden = aBuilder.GetAttr(nsGkAtoms::hidden)) {
    if (hidden->Equals(nsGkAtoms::untilFound, eIgnoreCase)) {
      aBuilder.SetKeywordValue(eCSSProperty_content_visibility,
                               StyleContentVisibility::Hidden);
    } else {
      aBuilder.SetKeywordValue(eCSSProperty_display, StyleDisplay::None._0);
    }
  }
}

/* static */
const nsGenericHTMLElement::MappedAttributeEntry
    nsGenericHTMLElement::sCommonAttributeMap[] = {{nsGkAtoms::contenteditable},
                                                   {nsGkAtoms::lang},
                                                   {nsGkAtoms::hidden},
                                                   {nullptr}};

/* static */
const Element::MappedAttributeEntry
    nsGenericHTMLElement::sImageMarginSizeAttributeMap[] = {{nsGkAtoms::width},
                                                            {nsGkAtoms::height},
                                                            {nsGkAtoms::hspace},
                                                            {nsGkAtoms::vspace},
                                                            {nullptr}};

/* static */
const Element::MappedAttributeEntry
    nsGenericHTMLElement::sImageAlignAttributeMap[] = {{nsGkAtoms::align},
                                                       {nullptr}};

/* static */
const Element::MappedAttributeEntry
    nsGenericHTMLElement::sDivAlignAttributeMap[] = {{nsGkAtoms::align},
                                                     {nullptr}};

/* static */
const Element::MappedAttributeEntry
    nsGenericHTMLElement::sImageBorderAttributeMap[] = {{nsGkAtoms::border},
                                                        {nullptr}};

/* static */
const Element::MappedAttributeEntry
    nsGenericHTMLElement::sBackgroundAttributeMap[] = {
        {nsGkAtoms::background}, {nsGkAtoms::bgcolor}, {nullptr}};

/* static */
const Element::MappedAttributeEntry
    nsGenericHTMLElement::sBackgroundColorAttributeMap[] = {
        {nsGkAtoms::bgcolor}, {nullptr}};

void nsGenericHTMLElement::MapImageAlignAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::align);
  if (value && value->Type() == nsAttrValue::eEnum) {
    switch (HTMLAlignValue(value->GetEnumValue())) {
      case HTMLAlignValue::Left:
        aBuilder.SetKeywordValue(eCSSProperty_float, StyleFloat::Left);
        break;
      case HTMLAlignValue::Right:
        aBuilder.SetKeywordValue(eCSSProperty_float, StyleFloat::Right);
        break;
      case HTMLAlignValue::TextTop:
        aBuilder.SetKeywordValue(eCSSProperty_alignment_baseline,
                                 StyleAlignmentBaseline::TextTop);
        break;
      case HTMLAlignValue::Top:
        aBuilder.SetKeywordValue(eCSSProperty_baseline_shift,
                                 StyleBaselineShiftKeyword::Top);
        break;
      case HTMLAlignValue::Middle:
      case HTMLAlignValue::Center:
        aBuilder.SetKeywordValue(eCSSProperty_alignment_baseline,
                                 StyleAlignmentBaseline::MozMiddleWithBaseline);
        break;
      case HTMLAlignValue::AbsMiddle:
      case HTMLAlignValue::AbsCenter:
        aBuilder.SetKeywordValue(eCSSProperty_alignment_baseline,
                                 StyleAlignmentBaseline::Middle);
        break;
      case HTMLAlignValue::AbsBottom:
        aBuilder.SetKeywordValue(eCSSProperty_baseline_shift,
                                 StyleBaselineShiftKeyword::Bottom);
        break;
      case HTMLAlignValue::Bottom:  // Intentionally mapped to `baseline`
      case HTMLAlignValue::Baseline:
        aBuilder.SetKeywordValue(eCSSProperty_alignment_baseline,
                                 StyleAlignmentBaseline::Baseline);
        break;
      default:
        MOZ_ASSERT_UNREACHABLE("Unexpected align value");
        break;
    }
  }
}

void nsGenericHTMLElement::MapDivAlignAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::align);
  if (value && value->Type() == nsAttrValue::eEnum) {
    switch (HTMLAlignValue(value->GetEnumValue())) {
      case HTMLAlignValue::Left:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::MozLeft);
        break;
      case HTMLAlignValue::Right:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::MozRight);
        break;
      case HTMLAlignValue::Center:
      case HTMLAlignValue::Middle:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::MozCenter);
        break;
      case HTMLAlignValue::Justify:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::Justify);
        break;
      default:
        MOZ_ASSERT_UNREACHABLE("Unexpected align value");
        break;
    }
  }
}

void nsGenericHTMLElement::MapTableVAlignAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::valign);
  if (value && value->Type() == nsAttrValue::eEnum) {
    switch (TableCellAlignment(value->GetEnumValue())) {
      case TableCellAlignment::Top:
        aBuilder.SetKeywordValue(eCSSProperty_baseline_shift,
                                 StyleBaselineShiftKeyword::Top);
        break;
      case TableCellAlignment::Middle:
        aBuilder.SetKeywordValue(eCSSProperty_alignment_baseline,
                                 StyleAlignmentBaseline::Middle);
        break;
      case TableCellAlignment::Bottom:
        aBuilder.SetKeywordValue(eCSSProperty_baseline_shift,
                                 StyleBaselineShiftKeyword::Bottom);
        break;
      case TableCellAlignment::Baseline:
        aBuilder.SetKeywordValue(eCSSProperty_alignment_baseline,
                                 StyleAlignmentBaseline::Baseline);
        break;
    }
  }
}

void nsGenericHTMLElement::MapTableHAlignAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::align);
  if (value && value->Type() == nsAttrValue::eEnum) {
    switch (HTMLAlignValue(value->GetEnumValue())) {
      case HTMLAlignValue::Center:
        aBuilder.SetAutoValueIfUnset(eCSSProperty_margin_left);
        aBuilder.SetAutoValueIfUnset(eCSSProperty_margin_right);
        break;
      case HTMLAlignValue::Left:
        aBuilder.SetKeywordValue(eCSSProperty_float, StyleFloat::Left);
        break;
      case HTMLAlignValue::Right:
        aBuilder.SetKeywordValue(eCSSProperty_float, StyleFloat::Right);
        break;
      default:
        MOZ_ASSERT_UNREACHABLE("Unexpected align value");
        break;
    }
  }
}

void nsGenericHTMLElement::MapTableCellHAlignAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::align);
  if (value && value->Type() == nsAttrValue::eEnum) {
    switch (HTMLAlignValue(value->GetEnumValue())) {
      case HTMLAlignValue::Left:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::MozLeft);
        break;
      case HTMLAlignValue::Right:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::MozRight);
        break;
      case HTMLAlignValue::Center:
      case HTMLAlignValue::Middle:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::MozCenter);
        break;
      case HTMLAlignValue::AbsMiddle:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::Center);
        break;
      case HTMLAlignValue::Justify:
        aBuilder.SetKeywordValue(eCSSProperty_text_align,
                                 StyleTextAlign::Justify);
        break;
      default:
        MOZ_ASSERT_UNREACHABLE("Unexpected align value");
        break;
    }
  }
}

void nsGenericHTMLElement::MapDimensionAttributeInto(
    MappedDeclarationsBuilder& aBuilder, NonCustomCSSPropertyId aProp,
    const nsAttrValue& aValue) {
  MOZ_ASSERT(!aBuilder.PropertyIsSet(aProp),
             "Why mapping the same property twice?");
  if (aValue.Type() == nsAttrValue::eInteger) {
    return aBuilder.SetPixelValue(aProp, aValue.GetIntegerValue());
  }
  if (aValue.Type() == nsAttrValue::ePercent) {
    return aBuilder.SetPercentValue(aProp, aValue.GetPercentValue());
  }
  if (aValue.Type() == nsAttrValue::eDoubleValue) {
    return aBuilder.SetPixelValue(aProp, aValue.GetDoubleValue());
  }
}

void nsGenericHTMLElement::MapImageMarginAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  // hspace: value
  if (const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::hspace)) {
    MapDimensionAttributeInto(aBuilder, eCSSProperty_margin_left, *value);
    MapDimensionAttributeInto(aBuilder, eCSSProperty_margin_right, *value);
  }

  // vspace: value
  if (const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::vspace)) {
    MapDimensionAttributeInto(aBuilder, eCSSProperty_margin_top, *value);
    MapDimensionAttributeInto(aBuilder, eCSSProperty_margin_bottom, *value);
  }
}

void nsGenericHTMLElement::MapWidthAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  if (const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::width)) {
    MapDimensionAttributeInto(aBuilder, eCSSProperty_width, *value);
  }
}

void nsGenericHTMLElement::MapHeightAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  if (const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::height)) {
    MapDimensionAttributeInto(aBuilder, eCSSProperty_height, *value);
  }
}

void nsGenericHTMLElement::DoMapAspectRatio(
    const nsAttrValue& aWidth, const nsAttrValue& aHeight,
    MappedDeclarationsBuilder& aBuilder) {
  Maybe<double> w;
  if (aWidth.Type() == nsAttrValue::eInteger) {
    w.emplace(aWidth.GetIntegerValue());
  } else if (aWidth.Type() == nsAttrValue::eDoubleValue) {
    w.emplace(aWidth.GetDoubleValue());
  }

  Maybe<double> h;
  if (aHeight.Type() == nsAttrValue::eInteger) {
    h.emplace(aHeight.GetIntegerValue());
  } else if (aHeight.Type() == nsAttrValue::eDoubleValue) {
    h.emplace(aHeight.GetDoubleValue());
  }

  if (w && h) {
    aBuilder.SetAspectRatio(*w, *h);
  }
}

void nsGenericHTMLElement::MapImageSizeAttributesInto(
    MappedDeclarationsBuilder& aBuilder, MapAspectRatio aMapAspectRatio) {
  auto* width = aBuilder.GetAttr(nsGkAtoms::width);
  auto* height = aBuilder.GetAttr(nsGkAtoms::height);
  if (width) {
    MapDimensionAttributeInto(aBuilder, eCSSProperty_width, *width);
  }
  if (height) {
    MapDimensionAttributeInto(aBuilder, eCSSProperty_height, *height);
  }
  if (aMapAspectRatio == MapAspectRatio::Yes && width && height) {
    DoMapAspectRatio(*width, *height, aBuilder);
  }
}

void nsGenericHTMLElement::MapAspectRatioInto(
    MappedDeclarationsBuilder& aBuilder) {
  auto* width = aBuilder.GetAttr(nsGkAtoms::width);
  auto* height = aBuilder.GetAttr(nsGkAtoms::height);
  if (width && height) {
    DoMapAspectRatio(*width, *height, aBuilder);
  }
}

void nsGenericHTMLElement::MapImageBorderAttributeInto(
    MappedDeclarationsBuilder& aBuilder) {
  // border: pixels
  const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::border);
  if (!value) return;

  nscoord val = 0;
  if (value->Type() == nsAttrValue::eInteger) val = value->GetIntegerValue();

  aBuilder.SetPixelValueIfUnset(eCSSProperty_border_top_width, (float)val);
  aBuilder.SetPixelValueIfUnset(eCSSProperty_border_right_width, (float)val);
  aBuilder.SetPixelValueIfUnset(eCSSProperty_border_bottom_width, (float)val);
  aBuilder.SetPixelValueIfUnset(eCSSProperty_border_left_width, (float)val);

  aBuilder.SetKeywordValueIfUnset(eCSSProperty_border_top_style,
                                  StyleBorderStyle::Solid);
  aBuilder.SetKeywordValueIfUnset(eCSSProperty_border_right_style,
                                  StyleBorderStyle::Solid);
  aBuilder.SetKeywordValueIfUnset(eCSSProperty_border_bottom_style,
                                  StyleBorderStyle::Solid);
  aBuilder.SetKeywordValueIfUnset(eCSSProperty_border_left_style,
                                  StyleBorderStyle::Solid);

  aBuilder.SetCurrentColorIfUnset(eCSSProperty_border_top_color);
  aBuilder.SetCurrentColorIfUnset(eCSSProperty_border_right_color);
  aBuilder.SetCurrentColorIfUnset(eCSSProperty_border_bottom_color);
  aBuilder.SetCurrentColorIfUnset(eCSSProperty_border_left_color);
}

void nsGenericHTMLElement::MapBackgroundInto(
    MappedDeclarationsBuilder& aBuilder) {
  if (!aBuilder.PropertyIsSet(eCSSProperty_background_image)) {
    // background
    if (const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::background)) {
      aBuilder.SetBackgroundImage(*value);
    }
  }
}

void nsGenericHTMLElement::MapBGColorInto(MappedDeclarationsBuilder& aBuilder) {
  if (aBuilder.PropertyIsSet(eCSSProperty_background_color)) {
    return;
  }
  const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::bgcolor);
  nscolor color;
  if (value && value->GetColorValue(color)) {
    aBuilder.SetColorValue(eCSSProperty_background_color, color);
  }
}

void nsGenericHTMLElement::MapBackgroundAttributesInto(
    MappedDeclarationsBuilder& aBuilder) {
  MapBackgroundInto(aBuilder);
  MapBGColorInto(aBuilder);
}

//----------------------------------------------------------------------

int32_t nsGenericHTMLElement::GetIntAttr(nsAtom* aAttr,
                                         int32_t aDefault) const {
  const nsAttrValue* attrVal = mAttrs.GetAttr(aAttr);
  if (attrVal && attrVal->Type() == nsAttrValue::eInteger) {
    return attrVal->GetIntegerValue();
  }
  return aDefault;
}

nsresult nsGenericHTMLElement::SetIntAttr(nsAtom* aAttr, int32_t aValue) {
  nsAutoString value;
  value.AppendInt(aValue);

  return SetAttr(kNameSpaceID_None, aAttr, value, true);
}

uint32_t nsGenericHTMLElement::GetUnsignedIntAttr(nsAtom* aAttr,
                                                  uint32_t aDefault) const {
  const nsAttrValue* attrVal = mAttrs.GetAttr(aAttr);
  if (!attrVal || attrVal->Type() != nsAttrValue::eInteger) {
    return aDefault;
  }

  return attrVal->GetIntegerValue();
}

uint32_t nsGenericHTMLElement::GetDimensionAttrAsUnsignedInt(
    nsAtom* aAttr, uint32_t aDefault) const {
  const nsAttrValue* attrVal = mAttrs.GetAttr(aAttr);
  if (!attrVal) {
    return aDefault;
  }

  if (attrVal->Type() == nsAttrValue::eInteger) {
    return attrVal->GetIntegerValue();
  }

  if (attrVal->Type() == nsAttrValue::ePercent) {
    // This is a nasty hack.  When we parsed the value, we stored it as an
    // ePercent, not eInteger, because there was a '%' after it in the string.
    // But the spec says to basically re-parse the string as an integer.
    // Luckily, we can just return the value we have stored.  But
    // GetPercentValue() divides it by 100, so we need to multiply it back.
    return uint32_t(attrVal->GetPercentValue() * 100.0f);
  }

  if (attrVal->Type() == nsAttrValue::eDoubleValue) {
    return uint32_t(attrVal->GetDoubleValue());
  }

  // Unfortunately, the set of values that are valid dimensions is not a
  // superset of values that are valid unsigned ints.  In particular "+100" is
  // not a valid dimension, but should parse as the unsigned int "100".  So if
  // we got here and we don't have a valid dimension value, just try re-parsing
  // the string we have as an integer.
  nsAutoString val;
  attrVal->ToString(val);
  nsContentUtils::ParseHTMLIntegerResultFlags result;
  int32_t parsedInt = nsContentUtils::ParseHTMLInteger(val, &result);
  if ((result & nsContentUtils::eParseHTMLInteger_Error) || parsedInt < 0) {
    return aDefault;
  }

  return parsedInt;
}

void nsGenericHTMLElement::GetURIAttr(nsAtom* aAttr, nsAtom* aBaseAttr,
                                      nsAString& aResult) const {
  nsCOMPtr<nsIURI> uri;
  const nsAttrValue* attr = GetURIAttr(aAttr, aBaseAttr, getter_AddRefs(uri));
  if (!attr) {
    aResult.Truncate();
    return;
  }
  if (!uri) {
    // Just return the attr value
    attr->ToString(aResult);
    return;
  }
  nsAutoCString spec;
  uri->GetSpec(spec);
  CopyUTF8toUTF16(spec, aResult);
}

void nsGenericHTMLElement::GetURIAttr(nsAtom* aAttr, nsAtom* aBaseAttr,
                                      nsACString& aResult) const {
  nsCOMPtr<nsIURI> uri;
  const nsAttrValue* attr = GetURIAttr(aAttr, aBaseAttr, getter_AddRefs(uri));
  if (!attr) {
    aResult.Truncate();
    return;
  }
  if (!uri) {
    // Just return the attr value
    nsAutoString value;
    attr->ToString(value);
    CopyUTF16toUTF8(value, aResult);
    return;
  }
  uri->GetSpec(aResult);
}

const nsAttrValue* nsGenericHTMLElement::GetURIAttr(nsAtom* aAttr,
                                                    nsAtom* aBaseAttr,
                                                    nsIURI** aURI) const {
  *aURI = nullptr;

  const nsAttrValue* attr = mAttrs.GetAttr(aAttr);
  if (!attr) {
    return nullptr;
  }

  nsCOMPtr<nsIURI> baseURI = GetBaseURI();
  if (aBaseAttr) {
    nsAutoString baseAttrValue;
    if (GetAttr(aBaseAttr, baseAttrValue)) {
      nsCOMPtr<nsIURI> baseAttrURI;
      nsresult rv = nsContentUtils::NewURIWithDocumentCharset(
          getter_AddRefs(baseAttrURI), baseAttrValue, OwnerDoc(), baseURI);
      if (NS_FAILED(rv)) {
        return attr;
      }
      baseURI.swap(baseAttrURI);
    }
  }

  // Don't care about return value.  If it fails, we still want to
  // return true, and *aURI will be null.
  nsContentUtils::NewURIWithDocumentCharset(
      aURI, nsAttrValueOrString(attr).String(), OwnerDoc(), baseURI);
  return attr;
}

bool nsGenericHTMLElement::IsContentEditable() const {
  if (IsInComposedDoc()) {
    return IsEditable();
  }
  // Editable flag is not set for non-connected elements, so we must compute it.
  for (const auto* element : InclusiveAncestorsOfType<nsGenericHTMLElement>()) {
    const ContentEditableState state = element->GetContentEditableState();
    if (state != ContentEditableState::Inherit) {
      return IsEditableState(state);
    }
  }
  return false;
}

bool nsGenericHTMLElement::IsLabelable() const {
  return IsAnyOfHTMLElements(nsGkAtoms::progress, nsGkAtoms::meter);
}

/* static */
bool nsGenericHTMLElement::MatchLabelsElement(Element* aElement,
                                              int32_t aNamespaceID,
                                              nsAtom* aAtom, void* aData) {
  HTMLLabelElement* element = HTMLLabelElement::FromNode(aElement);
  return element && element->GetLabeledElementInternal() == aData;
}

already_AddRefed<NodeList> nsGenericHTMLElement::LabelsForBindings() {
  return LabelsInternal();
}

already_AddRefed<NodeList> nsGenericHTMLElement::LabelsInternal() {
  MOZ_ASSERT(IsLabelable(),
             "Labels() only allow labelable elements to use it.");
  nsExtendedDOMSlots* slots = ExtendedDOMSlots();

  if (!slots->mLabelsList) {
    slots->mLabelsList =
        new LabelsNodeList(this, SubtreeRoot(), MatchLabelsElement, nullptr);
  }

  RefPtr<LabelsNodeList> labels = slots->mLabelsList;
  return labels.forget();
}

// static
bool nsGenericHTMLElement::LegacyTouchAPIEnabled(JSContext* aCx,
                                                 JSObject* aGlobal) {
  return TouchEvent::LegacyAPIEnabled(aCx, aGlobal);
}

bool nsGenericHTMLElement::IsFormControlDefaultFocusable(
    IsFocusableFlags aFlags) const {
  if (!(aFlags & IsFocusableFlags::WithMouse)) {
    return true;
  }
  switch (StaticPrefs::accessibility_mouse_focuses_formcontrol()) {
    case 0:
      return false;
    case 1:
      return true;
    default:
      return !IsInChromeDocument();
  }
}

//----------------------------------------------------------------------

nsGenericHTMLFormElement::nsGenericHTMLFormElement(
    already_AddRefed<mozilla::dom::NodeInfo> aNodeInfo)
    : nsGenericHTMLElement(std::move(aNodeInfo)) {
  // We should add the ElementState::ENABLED bit here as needed, but that
  // depends on our type, which is not initialized yet.  So we have to do this
  // in subclasses. Same for a couple other bits.
}

void nsGenericHTMLFormElement::ClearForm(bool aRemoveFromForm,
                                         bool aUnbindOrDelete) {
  MOZ_ASSERT(IsFormAssociatedElement());

  HTMLFormElement* form = GetFormInternal();
  NS_ASSERTION((form != nullptr) == HasFlag(ADDED_TO_FORM),
               "Form control should have had flag set correctly");

  if (!form) {
    return;
  }

  if (aRemoveFromForm) {
    nsAutoString nameVal, idVal;
    GetAttr(nsGkAtoms::name, nameVal);
    GetAttr(nsGkAtoms::id, idVal);

    form->RemoveElement(this, true);

    if (!nameVal.IsEmpty()) {
      form->RemoveElementFromTable(this, nameVal);
    }

    if (!idVal.IsEmpty()) {
      form->RemoveElementFromTable(this, idVal);
    }
  }

  UnsetFlags(ADDED_TO_FORM);
  SetFormInternal(nullptr, false);
  AfterClearForm(aUnbindOrDelete);
}

nsresult nsGenericHTMLFormElement::BindToTree(BindContext& aContext,
                                              nsINode& aParent) {
  nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
  NS_ENSURE_SUCCESS(rv, rv);

  if (IsFormAssociatedElement()) {
    // If @form is set, the element *has* to be in a composed document,
    // otherwise it wouldn't be possible to find an element with the
    // corresponding id. If @form isn't set, the element *has* to have a parent,
    // otherwise it wouldn't be possible to find a form ancestor. We should not
    // call UpdateFormOwner if none of these conditions are fulfilled.
    if (HasAttr(nsGkAtoms::form) ? IsInComposedDoc() : aParent.IsContent()) {
      UpdateFormOwner(true, nullptr);
    }
  }

  // Set parent fieldset which should be used for the disabled state.
  UpdateFieldSet(false);
  return NS_OK;
}

void nsGenericHTMLFormElement::UnbindFromTree(UnbindContext& aContext) {
  // Save state before doing anything else.
  SaveState();

  if (IsFormAssociatedElement()) {
    if (HTMLFormElement* form = GetFormInternal()) {
      // Might need to unset form
      if (aContext.IsUnbindRoot(this)) {
        // No more parent means no more form
        ClearForm(true, true);
      } else {
        // Recheck whether we should still have an form.
        if (HasAttr(nsGkAtoms::form) || !FindAncestorForm(form)) {
          ClearForm(true, true);
        } else {
          UnsetFlags(MAYBE_ORPHAN_FORM_ELEMENT);
        }
      }
    }

    // We have to remove the form attribute observer if there was one.
    // We will re-add one later if needed (during bind to tree).
    if (nsContentUtils::HasNonEmptyAttr(this, kNameSpaceID_None,
                                        nsGkAtoms::form)) {
      RemoveFormAttributeObserver();
    }
  }

  nsGenericHTMLElement::UnbindFromTree(aContext);

  // The element might not have a fieldset anymore.
  UpdateFieldSet(false);
}

void nsGenericHTMLFormElement::BeforeSetAttr(int32_t aNameSpaceID,
                                             nsAtom* aName,
                                             const nsAttrValue* aValue,
                                             bool aNotify) {
  if (aNameSpaceID == kNameSpaceID_None && IsFormAssociatedElement()) {
    nsAutoString tmp;
    HTMLFormElement* form = GetFormInternal();

    // remove the control from the hashtable as needed

    if (form && (aName == nsGkAtoms::name || aName == nsGkAtoms::id)) {
      GetAttr(aName, tmp);

      if (!tmp.IsEmpty()) {
        form->RemoveElementFromTable(this, tmp);
      }
    }

    if (form && aName == nsGkAtoms::type) {
      GetAttr(nsGkAtoms::name, tmp);

      if (!tmp.IsEmpty()) {
        form->RemoveElementFromTable(this, tmp);
      }

      GetAttr(nsGkAtoms::id, tmp);

      if (!tmp.IsEmpty()) {
        form->RemoveElementFromTable(this, tmp);
      }

      form->RemoveElement(this, false);
    }
  }

  return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName, aValue,
                                             aNotify);
}

void nsGenericHTMLFormElement::AfterSetAttr(
    int32_t aNameSpaceID, nsAtom* aName, const nsAttrValue* aValue,
    const nsAttrValue* aOldValue, nsIPrincipal* aMaybeScriptedPrincipal,
    bool aNotify) {
  if (aNameSpaceID == kNameSpaceID_None && IsFormAssociatedElement()) {
    if (aName == nsGkAtoms::form) {
      bool hadOldValue = aOldValue && !aOldValue->GetAtomValue()->IsEmpty();
      bool hasNewValue = aValue && !aValue->GetAtomValue()->IsEmpty();
      if (hadOldValue || hasNewValue) {
        if (!hadOldValue && hasNewValue) {
          AddFormAttributeObserver();
        }

        // Fire the observer, which will update the form owner if necessary.
        IDREFAttributeValueChanged(aName, aValue);

        if (hadOldValue && !hasNewValue) {
          RemoveFormAttributeObserver();
        }
      } else if (aValue && aValue->GetAtomValue()->IsEmpty()) {
        // Ensure that empty @form value clears the form owner.
        ClearForm(true, false);
      }
    } else if (HTMLFormElement* form = GetFormInternal()) {
      // add the control to the hashtable as needed
      if (aName == nsGkAtoms::type) {
        nsAutoString tmp;

        GetAttr(nsGkAtoms::name, tmp);

        if (!tmp.IsEmpty()) {
          form->AddElementToTable(this, tmp);
        }

        GetAttr(nsGkAtoms::id, tmp);

        if (!tmp.IsEmpty()) {
          form->AddElementToTable(this, tmp);
        }

        form->AddElement(this, false, aNotify);
      } else if (aName == nsGkAtoms::name || aName == nsGkAtoms::id) {
        if (aValue && !aValue->IsEmptyString()) {
          MOZ_ASSERT(aValue->Type() == nsAttrValue::eAtom,
                     "Expected atom value for name/id");
          form->AddElementToTable(
              this, nsDependentAtomString(aValue->GetAtomValue()));
        }
      }
    }
  }

  return nsGenericHTMLElement::AfterSetAttr(
      aNameSpaceID, aName, aValue, aOldValue, aMaybeScriptedPrincipal, aNotify);
}

void nsGenericHTMLFormElement::ForgetFieldSet(nsIContent* aFieldset) {
  MOZ_DIAGNOSTIC_ASSERT(IsFormAssociatedElement());
  if (GetFieldSetInternal() == aFieldset) {
    SetFieldSetInternal(nullptr);
  }
}

Element* nsGenericHTMLFormElement::AddFormAttributeObserver() {
  MOZ_ASSERT(IsFormAssociatedElement());

  nsAutoString formId;
  GetAttr(nsGkAtoms::form, formId);
  NS_ASSERTION(!formId.IsEmpty(),
               "@form value should not be the empty string!");

  return AddAttrAssociatedElementObserver(nsGkAtoms::form,
                                          FormAttributeUpdated);
}

void nsGenericHTMLFormElement::RemoveFormAttributeObserver() {
  MOZ_ASSERT(IsFormAssociatedElement());

  RemoveAttrAssociatedElementObserver(nsGkAtoms::form, FormAttributeUpdated);
}

/* static */
bool nsGenericHTMLFormElement::FormAttributeUpdated(Element* aOldElement,
                                                    Element* aNewElement,
                                                    Element* thisElement) {
  NS_ASSERTION(thisElement->IsHTMLElement(),
               "thisElement should be an HTML element");

  nsGenericHTMLFormElement* element =
      static_cast<nsGenericHTMLFormElement*>(thisElement);
  element->UpdateFormOwner(false, aNewElement);

  return true;
}

bool nsGenericHTMLFormElement::IsElementDisabledForEvents(WidgetEvent* aEvent,
                                                          nsIFrame* aFrame) {
  MOZ_ASSERT(aEvent);

  // Allow dispatch of CustomEvent and untrusted Events.
  if (!aEvent->IsTrusted()) {
    return false;
  }

  switch (aEvent->mMessage) {
    case eAnimationStart:
    case eAnimationEnd:
    case eAnimationIteration:
    case eAnimationCancel:
    case eFormChange:
    case eMouseMove:
    case eMouseOver:
    case eMouseOut:
    case eMouseEnter:
    case eMouseLeave:
    case ePointerMove:
    case ePointerOver:
    case ePointerOut:
    case ePointerEnter:
    case ePointerLeave:
    case eTransitionCancel:
    case eTransitionEnd:
    case eTransitionRun:
    case eTransitionStart:
    case eWheel:
    case eLegacyMouseLineOrPageScroll:
    case eLegacyMousePixelScroll:
      return false;
    case eFocus:
    case eBlur:
    case eFocusIn:
    case eFocusOut:
    case eKeyPress:
    case eKeyUp:
    case eKeyDown:
      if (StaticPrefs::dom_forms_always_allow_key_and_focus_events_enabled()) {
        return false;
      }
      [[fallthrough]];
    case ePointerDown:
    case ePointerUp:
    case ePointerCancel:
    case ePointerGotCapture:
    case ePointerLostCapture:
      if (StaticPrefs::dom_forms_always_allow_pointer_events_enabled()) {
        return false;
      }
      [[fallthrough]];
    default:
      break;
  }

  if (aEvent->mSpecifiedEventType == nsGkAtoms::oninput) {
    return false;
  }

  return IsDisabled();
}

void nsGenericHTMLFormElement::UpdateFormOwner(bool aBindToTree,
                                               Element* aFormIdElement) {
  MOZ_ASSERT(IsFormAssociatedElement());
  MOZ_ASSERT(!aBindToTree || !aFormIdElement,
             "aFormIdElement shouldn't be set if aBindToTree is true!");

  HTMLFormElement* form = GetFormInternal();
  if (!aBindToTree) {
    ClearForm(true, false);
    form = nullptr;
  }

  HTMLFormElement* oldForm = form;
  if (!form) {
    // If @form is set, we have to use that to find the form.
    nsAutoString formId;
    if (GetAttr(nsGkAtoms::form, formId)) {
      if (!formId.IsEmpty()) {
        Element* element = nullptr;

        if (aBindToTree) {
          element = AddFormAttributeObserver();
        } else {
          element = aFormIdElement;
        }

        NS_ASSERTION(
            !IsInComposedDoc() ||
                element == GetAttrAssociatedElementInternal(nsGkAtoms::form),
            "element should be equals to the current element "
            "associated via @form!");

        if (element && element->IsHTMLElement(nsGkAtoms::form) &&
            element->GetClosestNativeAnonymousSubtreeRoot() ==
                GetClosestNativeAnonymousSubtreeRoot() &&
            (StaticPrefs::dom_shadowdom_referenceTarget_enabled() ||
             element->GetContainingShadow() == GetContainingShadow())) {
          form = static_cast<HTMLFormElement*>(element);
          SetFormInternal(form, aBindToTree);
        }
      }
    } else {
      // We now have a parent, so we may have picked up an ancestor form. Search
      // for it.  Note that if form is already set we don't want to do this,
      // because that means someone (probably the content sink) has already set
      // it to the right value.  Also note that even if being bound here didn't
      // change our parent, we still need to search, since our parent chain
      // probably changed _somewhere_.
      form = FindAncestorForm();
      SetFormInternal(form, aBindToTree);
    }
  }

  if (form && !HasFlag(ADDED_TO_FORM)) {
    // Now we need to add ourselves to the form
    nsAutoString nameVal, idVal;
    GetAttr(nsGkAtoms::name, nameVal);
    GetAttr(nsGkAtoms::id, idVal);

    SetFlags(ADDED_TO_FORM);

    // Notify only if we just found this form.
    form->AddElement(this, true, oldForm == nullptr);

    if (!nameVal.IsEmpty()) {
      form->AddElementToTable(this, nameVal);
    }

    if (!idVal.IsEmpty()) {
      form->AddElementToTable(this, idVal);
    }
  }
}

void nsGenericHTMLFormElement::UpdateFieldSet(bool aNotify) {
  if (IsInNativeAnonymousSubtree() || !IsFormAssociatedElement()) {
    MOZ_ASSERT_IF(IsFormAssociatedElement(), !GetFieldSetInternal());
    return;
  }

  nsIContent* parent = nullptr;
  nsIContent* prev = nullptr;
  HTMLFieldSetElement* fieldset = GetFieldSetInternal();

  for (parent = GetParent(); parent;
       prev = parent, parent = parent->GetParent()) {
    HTMLFieldSetElement* parentFieldset = HTMLFieldSetElement::FromNode(parent);
    if (parentFieldset && (!prev || parentFieldset->GetFirstLegend() != prev)) {
      if (fieldset == parentFieldset) {
        // We already have the right fieldset;
        return;
      }

      if (fieldset) {
        fieldset->RemoveElement(this);
      }
      SetFieldSetInternal(parentFieldset);
      parentFieldset->AddElement(this);

      // The disabled state may have changed
      FieldSetDisabledChanged(aNotify);
      return;
    }
  }

  // No fieldset found.
  if (fieldset) {
    fieldset->RemoveElement(this);
    SetFieldSetInternal(nullptr);
    // The disabled state may have changed
    FieldSetDisabledChanged(aNotify);
  }
}

void nsGenericHTMLFormElement::UpdateDisabledState(bool aNotify) {
  if (!CanBeDisabled()) {
    return;
  }

  HTMLFieldSetElement* fieldset = GetFieldSetInternal();
  const bool isDisabled =
      HasAttr(nsGkAtoms::disabled) || (fieldset && fieldset->IsDisabled());

  const ElementState disabledStates =
      isDisabled ? ElementState::DISABLED : ElementState::ENABLED;

  ElementState oldDisabledStates = State() & ElementState::DISABLED_STATES;
  ElementState changedStates = disabledStates ^ oldDisabledStates;

  if (!changedStates.IsEmpty()) {
    ToggleStates(changedStates, aNotify);
    if (DoesReadWriteApply()) {
      // :disabled influences :read-only / :read-write.
      UpdateReadOnlyState(aNotify);
    }
  }
}

bool nsGenericHTMLFormElement::IsReadOnlyInternal() const {
  if (DoesReadWriteApply()) {
    return IsDisabled() || GetBoolAttr(nsGkAtoms::readonly);
  }
  return nsGenericHTMLElement::IsReadOnlyInternal();
}

void nsGenericHTMLFormElement::FieldSetDisabledChanged(bool aNotify) {
  UpdateDisabledState(aNotify);
}

void nsGenericHTMLFormElement::SaveSubtreeState() {
  SaveState();

  nsGenericHTMLElement::SaveSubtreeState();
}

//----------------------------------------------------------------------

void nsGenericHTMLElement::Click(CallerType aCallerType) {
  if (HandlingClick()) {
    return;
  }

  // There are two notions of disabled.
  // "disabled":
  // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#attr-fe-disabled
  // "actually disabled":
  // https://html.spec.whatwg.org/multipage/semantics-other.html#concept-element-disabled
  // click() reads the former but IsDisabled() is for the latter. <fieldset> is
  // included only in the latter, so we exclude it here.
  // XXX(krosylight): What about <optgroup>? And should we add a separate method
  // for this?
  if (IsDisabled() &&
      !(mNodeInfo->Equals(nsGkAtoms::fieldset) &&
        StaticPrefs::dom_forms_fieldset_disable_only_descendants_enabled())) {
    return;
  }

  // Strong in case the event kills it
  nsCOMPtr<Document> doc = GetComposedDoc();

  RefPtr<nsPresContext> context;
  if (doc) {
    PresShell* presShell = doc->GetPresShell();
    if (!presShell) {
      // We need the nsPresContext for dispatching the click event. In some
      // rare cases we need to flush notifications to force creation of the
      // nsPresContext here (for example when a script calls button.click()
      // from script early during page load). We only flush the notifications
      // if the PresShell hasn't been created yet, to limit the performance
      // impact.
      doc->FlushPendingNotifications(FlushType::EnsurePresShellInitAndFrames);
      presShell = doc->GetPresShell();
    }
    if (presShell) {
      context = presShell->GetPresContext();
    }
  }

  SetHandlingClick();

  // Mark this event trusted if Click() is called from system code.
  WidgetPointerEvent event(aCallerType == CallerType::System, ePointerClick,
                           nullptr);
  event.mFlags.mIsPositionless = true;
  event.mInputSource = MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
  // pointerId definition in Pointer Events:
  // > The pointerId value of -1 MUST be reserved and used to indicate events
  // > that were generated by something other than a pointing device.
  event.pointerId = -1;

  EventDispatcher::Dispatch(this, context, &event);

  ClearHandlingClick();
}

bool nsGenericHTMLElement::IsHTMLFocusable(IsFocusableFlags aFlags,
                                           bool* aIsFocusable,
                                           int32_t* aTabIndex) {
  MOZ_ASSERT(aIsFocusable);
  MOZ_ASSERT(aTabIndex);
  if (ShadowRoot* root = GetShadowRoot()) {
    if (root->DelegatesFocus()) {
      *aIsFocusable = false;
      return true;
    }
  }

  if (!IsInComposedDoc() || IsInDesignMode()) {
    // In designMode documents we only allow focusing the document.
    *aTabIndex = -1;
    *aIsFocusable = false;
    return true;
  }

  *aTabIndex = TabIndex();
  bool disabled = false;
  bool disallowOverridingFocusability = true;
  Maybe<int32_t> attrVal = GetTabIndexAttrValue();
  if (IsEditingHost()) {
    // Editable roots should always be focusable.
    disallowOverridingFocusability = true;

    // Ignore the disabled attribute in editable contentEditable/designMode
    // roots.
    if (attrVal.isNothing()) {
      // The default value for tabindex should be 0 for editable
      // contentEditable roots.
      *aTabIndex = 0;
    }
  } else {
    disallowOverridingFocusability = false;

    // Just check for disabled attribute on form controls
    disabled = IsDisabled();
    if (disabled) {
      *aTabIndex = -1;
    }
  }

  // If a tabindex is specified at all, or the default tabindex is 0, we're
  // focusable.
  *aIsFocusable = (*aTabIndex >= 0 || (!disabled && attrVal.isSome()));
  return disallowOverridingFocusability;
}

Result<bool, nsresult> nsGenericHTMLElement::PerformAccesskey(
    bool aKeyCausesActivation, bool aIsTrustedEvent) {
  RefPtr<nsPresContext> presContext = GetPresContext(eForComposedDoc);
  if (!presContext) {
    return Err(NS_ERROR_UNEXPECTED);
  }

  // It's hard to say what HTML4 wants us to do in all cases.
  bool focused = true;
  if (RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager()) {
    fm->SetFocus(this, nsIFocusManager::FLAG_BYKEY);

    // Return true if the element became the current focus within its window.
    nsPIDOMWindowOuter* window = OwnerDoc()->GetWindow();
    focused = window && window->GetFocusedElement() == this;
  }

  if (aKeyCausesActivation) {
    // Click on it if the users prefs indicate to do so.
    AutoHandlingUserInputStatePusher userInputStatePusher(aIsTrustedEvent);
    AutoPopupStatePusher popupStatePusher(
        aIsTrustedEvent ? PopupBlocker::openAllowed : PopupBlocker::openAbused);
    DispatchSimulatedClick(this, aIsTrustedEvent, presContext);
    return focused;
  }

  // If the accesskey won't cause the activation and the focus isn't changed,
  // either. Return error so EventStateManager would try to find next element
  // to handle the accesskey.
  return focused ? Result<bool, nsresult>{focused} : Err(NS_ERROR_ABORT);
}

void nsGenericHTMLElement::HandleKeyboardActivation(
    EventChainPostVisitor& aVisitor) {
  MOZ_ASSERT(aVisitor.mEvent->HasKeyEventMessage());
  MOZ_ASSERT(aVisitor.mEvent->IsTrusted());

  // If focused element is different from this element, it may be editable.
  // In that case, associated editor for the element should handle the keyboard
  // instead.  Therefore, if this is not the focused element, we should not
  // handle the event here.  Note that this element may be an editing host,
  // i.e., focused and editable.  In the case, keyboard events should be
  // handled by the focused element instead of associated editor because
  // Chrome handles the case so.  For compatibility with Chrome, we follow them.
  if (nsFocusManager::GetFocusedElementStatic() != this) {
    return;
  }

  const auto message = aVisitor.mEvent->mMessage;
  const WidgetKeyboardEvent* keyEvent = aVisitor.mEvent->AsKeyboardEvent();
  if (nsEventStatus_eIgnore != aVisitor.mEventStatus) {
    if (message == eKeyUp && keyEvent->mKeyCode == NS_VK_SPACE) {
      // Unset the flag even if the event is default-prevented or something.
      UnsetFlags(HTML_ELEMENT_ACTIVE_FOR_KEYBOARD);
    }
    return;
  }

  bool shouldActivate = false;
  switch (message) {
    case eKeyDown:
      if (keyEvent->ShouldWorkAsSpaceKey()) {
        SetFlags(HTML_ELEMENT_ACTIVE_FOR_KEYBOARD);
      }
      return;
    case eKeyPress:
      shouldActivate = keyEvent->mKeyCode == NS_VK_RETURN;
      if (keyEvent->ShouldWorkAsSpaceKey()) {
        // Consume 'space' key to prevent scrolling the page down.
        aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault;
      }
      break;
    case eKeyUp:
      shouldActivate = keyEvent->ShouldWorkAsSpaceKey() &&
                       HasFlag(HTML_ELEMENT_ACTIVE_FOR_KEYBOARD);
      if (shouldActivate) {
        UnsetFlags(HTML_ELEMENT_ACTIVE_FOR_KEYBOARD);
      }
      break;
    default:
      MOZ_ASSERT_UNREACHABLE("why didn't we bail out earlier?");
      break;
  }

  if (!shouldActivate) {
    return;
  }

  RefPtr<nsPresContext> presContext = aVisitor.mPresContext;
  DispatchSimulatedClick(this, aVisitor.mEvent->IsTrusted(), presContext);
  aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault;
}

nsresult nsGenericHTMLElement::DispatchSimulatedClick(
    nsGenericHTMLElement* aElement, bool aIsTrusted,
    nsPresContext* aPresContext) {
  WidgetPointerEvent event(aIsTrusted, ePointerClick, nullptr);
  event.mFlags.mIsPositionless = true;
  event.mInputSource = MouseEvent_Binding::MOZ_SOURCE_KEYBOARD;
  // pointerId definition in Pointer Events:
  // > The pointerId value of -1 MUST be reserved and used to indicate events
  // > that were generated by something other than a pointing device.
  event.pointerId = -1;
  return EventDispatcher::Dispatch(aElement, aPresContext, &event);
}

already_AddRefed<EditorBase> nsGenericHTMLElement::GetAssociatedEditor() {
  // If contenteditable is ever implemented, it might need to do something
  // different here?

  RefPtr<TextEditor> textEditor = GetTextEditorInternal();
  return textEditor.forget();
}

// static
void nsGenericHTMLElement::SyncEditorsOnSubtree(nsIContent* content) {
  /* Sync this node */
  nsGenericHTMLElement* element = FromNode(content);
  if (element) {
    if (RefPtr<EditorBase> editorBase = element->GetAssociatedEditor()) {
      editorBase->SyncRealTimeSpell();
    }
  }

  /* Sync all children */
  for (nsIContent* child = content->GetFirstChild(); child;
       child = child->GetNextSibling()) {
    SyncEditorsOnSubtree(child);
  }
}

static void MakeContentDescendantsEditable(nsIContent* aContent) {
  // If aContent is not an element, we just need to update its
  // internal editable state and don't need to notify anyone about
  // that.  For elements, we need to send a ElementStateChanged
  // notification.
  if (!aContent->IsElement()) {
    aContent->UpdateEditableState(false);
    return;
  }

  Element* element = aContent->AsElement();

  element->UpdateEditableState(true);

  for (nsIContent* child = aContent->GetFirstChild(); child;
       child = child->GetNextSibling()) {
    if (!child->IsElement() ||
        !child->AsElement()->HasAttr(nsGkAtoms::contenteditable)) {
      MakeContentDescendantsEditable(child);
    }
  }
}

void nsGenericHTMLElement::ChangeEditableState(int32_t aChange) {
  Document* document = GetComposedDoc();
  if (!document) {
    return;
  }

  Document::EditingState previousEditingState = Document::EditingState::eOff;
  if (aChange != 0) {
    document->ChangeContentEditableCount(this, aChange);
    previousEditingState = document->GetEditingState();
  }

  // MakeContentDescendantsEditable is going to call ElementStateChanged for
  // this element and all descendants if editable state has changed.
  // We might as well wrap it all in one script blocker.
  nsAutoScriptBlocker scriptBlocker;
  MakeContentDescendantsEditable(this);

  // If the document already had contenteditable and JS adds new
  // contenteditable, that might cause changing editing host to current editing
  // host's ancestor.  In such case, HTMLEditor needs to know that
  // synchronously to update selection limitter.
  // Additionally, elements in shadow DOM is not editable in the normal cases,
  // but if its content has `contenteditable`, only in it can be ediable.
  // So we don't need to notify HTMLEditor of this change only when we're not
  // in shadow DOM and the composed document is in design mode.
  if (IsInDesignMode() && !IsInShadowTree() && aChange > 0 &&
      previousEditingState == Document::EditingState::eContentEditable) {
    if (const RefPtr<HTMLEditor> htmlEditor =
            nsContentUtils::GetHTMLEditor(document->GetPresContext())) {
      htmlEditor->NotifyEditingHostMaybeChanged();
    }
  }
}

//----------------------------------------------------------------------

nsGenericHTMLFormControlElement::nsGenericHTMLFormControlElement(
    already_AddRefed<mozilla::dom::NodeInfo> aNodeInfo, FormControlType aType)
    : nsGenericHTMLFormElement(std::move(aNodeInfo)),
      nsIFormControl(aType),
      mForm(nullptr),
      mFieldSet(nullptr) {}

nsGenericHTMLFormControlElement::~nsGenericHTMLFormControlElement() {
  if (mFieldSet) {
    mFieldSet->RemoveElement(this);
  }

  // Check that this element doesn't know anything about its form at this point.
  NS_ASSERTION(!mForm, "mForm should be null at this point!");
}

NS_IMPL_ISUPPORTS_INHERITED(nsGenericHTMLFormControlElement,
                            nsGenericHTMLFormElement, nsIFormControl)

nsINode* nsGenericHTMLFormControlElement::GetScopeChainParent() const {
  return mForm ? mForm : nsGenericHTMLElement::GetScopeChainParent();
}

nsIContent::IMEState nsGenericHTMLFormControlElement::GetDesiredIMEState() {
  TextEditor* textEditor = GetTextEditorInternal();
  if (!textEditor) {
    return nsGenericHTMLFormElement::GetDesiredIMEState();
  }
  Result<IMEState, nsresult> stateOrError = textEditor->GetPreferredIMEState();
  if (MOZ_UNLIKELY(stateOrError.isErr())) {
    return nsGenericHTMLFormElement::GetDesiredIMEState();
  }
  return stateOrError.unwrap();
}

void nsGenericHTMLFormControlElement::GetAutocapitalize(
    nsAString& aValue) const {
  if (nsContentUtils::HasNonEmptyAttr(this, kNameSpaceID_None,
                                      nsGkAtoms::autocapitalize)) {
    nsGenericHTMLFormElement::GetAutocapitalize(aValue);
    return;
  }

  if (mForm && IsAutocapitalizeOrAutocorrectInheriting()) {
    mForm->GetAutocapitalize(aValue);
  }
}

// https://html.spec.whatwg.org/#dom-autocorrect
bool nsGenericHTMLFormControlElement::Autocorrect() const {
  auto controlType = ControlType();

  switch (controlType) {
    case FormControlType::InputEmail:
    case FormControlType::InputPassword:
    case FormControlType::InputUrl:
      return false;
    default:
      break;
  }

  if (HasAttr(kNameSpaceID_None, nsGkAtoms::autocorrect)) {
    return nsGenericHTMLElement::Autocorrect();
  }

  if (mForm && IsAutocapitalizeOrAutocorrectInheriting()) {
    return mForm->Autocorrect();
  }

  return true;
}

bool nsGenericHTMLFormControlElement::IsHTMLFocusable(IsFocusableFlags aFlags,
                                                      bool* aIsFocusable,
                                                      int32_t* aTabIndex) {
  if (nsGenericHTMLFormElement::IsHTMLFocusable(aFlags, aIsFocusable,
                                                aTabIndex)) {
    return true;
  }

  *aIsFocusable = *aIsFocusable && IsFormControlDefaultFocusable(aFlags);
  return false;
}

HTMLFieldSetElement* nsGenericHTMLFormControlElement::GetFieldSet() {
  return GetFieldSetInternal();
}

mozilla::dom::Element* nsGenericHTMLFormControlElement::GetFormForBindings()
    const {
  if (!mForm) {
    return nullptr;
  }
  return RetargetReferenceTargetForBindings(mForm);
}

void nsGenericHTMLFormControlElement::SetForm(HTMLFormElement* aForm) {
  MOZ_ASSERT(aForm, "Don't pass null here");
  MOZ_ASSERT(!mForm && !HasFlag(ADDED_TO_FORM),
             "We don't support switching from one non-null form to another.");

  SetFormInternal(aForm, false);
}

void nsGenericHTMLFormControlElement::ClearForm(bool aRemoveFromForm,
                                                bool aUnbindOrDelete) {
  nsGenericHTMLFormElement::ClearForm(aRemoveFromForm, aUnbindOrDelete);
}

bool nsGenericHTMLFormControlElement::IsLabelable() const {
  auto type = ControlType();
  return (IsInputElement(type) && type != FormControlType::InputHidden) ||
         IsButtonElement(type) || type == FormControlType::Output ||
         type == FormControlType::Select || type == FormControlType::Textarea;
}

bool nsGenericHTMLFormControlElement::CanBeDisabled() const {
  auto type = ControlType();
  // It's easier to test the types that _cannot_ be disabled
  return type != FormControlType::Object && type != FormControlType::Output;
}

bool nsGenericHTMLFormControlElement::DoesReadWriteApply() const {
  auto type = ControlType();
  if (!IsInputElement(type) && type != FormControlType::Textarea) {
    return false;
  }

  switch (type) {
    case FormControlType::InputHidden:
    case FormControlType::InputButton:
    case FormControlType::InputImage:
    case FormControlType::InputReset:
    case FormControlType::InputSubmit:
    case FormControlType::InputRadio:
    case FormControlType::InputFile:
    case FormControlType::InputCheckbox:
    case FormControlType::InputRange:
    case FormControlType::InputColor:
      return false;
#ifdef DEBUG
    case FormControlType::Textarea:
    case FormControlType::InputText:
    case FormControlType::InputPassword:
    case FormControlType::InputSearch:
    case FormControlType::InputTel:
    case FormControlType::InputEmail:
    case FormControlType::InputUrl:
    case FormControlType::InputNumber:
    case FormControlType::InputDate:
    case FormControlType::InputTime:
    case FormControlType::InputMonth:
    case FormControlType::InputWeek:
    case FormControlType::InputDatetimeLocal:
      return true;
    default:
      MOZ_ASSERT_UNREACHABLE("Unexpected input type in DoesReadWriteApply()");
      return true;
#else   // DEBUG
    default:
      return true;
#endif  // DEBUG
  }
}

void nsGenericHTMLFormControlElement::SetFormInternal(HTMLFormElement* aForm,
                                                      bool aBindToTree) {
  if (aForm) {
    BeforeSetForm(aForm, aBindToTree);
  }

  // keep a *weak* ref to the form here
  mForm = aForm;
}

HTMLFormElement* nsGenericHTMLFormControlElement::GetFormInternal() const {
  return mForm;
}

HTMLFieldSetElement* nsGenericHTMLFormControlElement::GetFieldSetInternal()
    const {
  return mFieldSet;
}

void nsGenericHTMLFormControlElement::SetFieldSetInternal(
    HTMLFieldSetElement* aFieldset) {
  mFieldSet = aFieldset;
}

void nsGenericHTMLFormControlElement::UpdateRequiredState(bool aIsRequired,
                                                          bool aNotify) {
#ifdef DEBUG
  auto type = ControlType();
#endif
  MOZ_ASSERT(IsInputElement(type) || type == FormControlType::Select ||
                 type == FormControlType::Textarea,
             "This should be called only on types that @required applies");

#ifdef DEBUG
  if (HTMLInputElement* input = HTMLInputElement::FromNode(this)) {
    MOZ_ASSERT(
        input->DoesRequiredApply(),
        "This should be called only on input types that @required applies");
  }
#endif

  ElementState requiredStates;
  if (aIsRequired) {
    requiredStates |= ElementState::REQUIRED;
  } else {
    requiredStates |= ElementState::OPTIONAL_;
  }

  ElementState oldRequiredStates = State() & ElementState::REQUIRED_STATES;
  ElementState changedStates = requiredStates ^ oldRequiredStates;

  if (!changedStates.IsEmpty()) {
    ToggleStates(changedStates, aNotify);
  }
}

bool nsGenericHTMLFormControlElement::IsAutocapitalizeOrAutocorrectInheriting()
    const {
  auto type = ControlType();
  return IsInputElement(type) || IsButtonElement(type) ||
         type == FormControlType::Fieldset || type == FormControlType::Output ||
         type == FormControlType::Select || type == FormControlType::Textarea;
}

nsresult nsGenericHTMLFormControlElement::SubmitDirnameDir(
    FormData* aFormData) {
  // Submit dirname=dir if element has non-empty dirname attribute
  if (HasAttr(nsGkAtoms::dirname)) {
    nsAutoString dirname;
    GetAttr(nsGkAtoms::dirname, dirname);
    if (!dirname.IsEmpty()) {
      const Directionality dir = GetDirectionality();
      MOZ_ASSERT(dir == Directionality::Ltr || dir == Directionality::Rtl,
                 "The directionality of an element is either ltr or rtl");
      return aFormData->AddNameValuePair(
          dirname, dir == Directionality::Ltr ? u"ltr"_ns : u"rtl"_ns);
    }
  }
  return NS_OK;
}

void nsGenericHTMLFormControlElement::GetFormAutofillState(
    nsAString& aState) const {
  if (State().HasState(ElementState::AUTOFILL_PREVIEW)) {
    aState.AssignLiteral("preview");
  } else if (State().HasState(ElementState::AUTOFILL)) {
    aState.AssignLiteral("autofill");
  } else {
    aState.Truncate();
  }
}

void nsGenericHTMLFormControlElement::SetFormAutofillState(
    const nsAString& aState) {
  if (aState.EqualsLiteral("autofill")) {
    RemoveStates(ElementState::AUTOFILL_PREVIEW);
    AddStates(ElementState::AUTOFILL);
  } else if (aState.EqualsLiteral("preview")) {
    AddStates(ElementState::AUTOFILL | ElementState::AUTOFILL_PREVIEW);
  } else {
    RemoveStates(ElementState::AUTOFILL | ElementState::AUTOFILL_PREVIEW);
  }
}

//----------------------------------------------------------------------

static constexpr nsAttrValue::EnumTableEntry kPopoverTargetActionTable[] = {
    {"toggle", PopoverTargetAction::Toggle},
    {"show", PopoverTargetAction::Show},
    {"hide", PopoverTargetAction::Hide},
};

static constexpr const nsAttrValue::EnumTableEntry*
    kPopoverTargetActionDefault = &kPopoverTargetActionTable[0];

nsGenericHTMLFormControlElementWithState::
    nsGenericHTMLFormControlElementWithState(
        already_AddRefed<mozilla::dom::NodeInfo> aNodeInfo,
        FromParser aFromParser, FormControlType aType)
    : nsGenericHTMLFormControlElement(std::move(aNodeInfo), aType),
      mControlNumber(!!(aFromParser & FROM_PARSER_NETWORK)
                         ? OwnerDoc()->GetNextControlNumber()
                         : -1) {
  mStateKey.SetIsVoid(true);
}

bool nsGenericHTMLFormControlElementWithState::ParseAttribute(
    int32_t aNamespaceID, nsAtom* aAttribute, const nsAString& aValue,
    nsIPrincipal* aMaybeScriptedPrincipal, nsAttrValue& aResult) {
  if (aNamespaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::popovertargetaction) {
      return aResult.ParseEnumValue(aValue, kPopoverTargetActionTable, false,
                                    kPopoverTargetActionDefault);
    }
    if (aAttribute == nsGkAtoms::popovertarget) {
      aResult.ParseAtom(aValue);
      return true;
    }
  }

  return nsGenericHTMLFormControlElement::ParseAttribute(
      aNamespaceID, aAttribute, aValue, aMaybeScriptedPrincipal, aResult);
}

mozilla::dom::Element*
nsGenericHTMLFormControlElementWithState::GetPopoverTargetElementForBindings()
    const {
  return GetAttrAssociatedElementForBindings(nsGkAtoms::popovertarget);
}

mozilla::dom::Element*
nsGenericHTMLFormControlElementWithState::GetPopoverTargetElementInternal()
    const {
  return GetAttrAssociatedElementInternal(nsGkAtoms::popovertarget);
}

void nsGenericHTMLFormControlElementWithState::
    SetPopoverTargetElementForBindings(mozilla::dom::Element* aElement) {
  ExplicitlySetAttrElement(nsGkAtoms::popovertarget, aElement);
}

// https://html.spec.whatwg.org/multipage/#popover-target-attribute-activation-behavior
void nsGenericHTMLFormControlElementWithState::HandlePopoverTargetAction(
    mozilla::dom::Element* aEventTarget) {
  // 1. Let popover be node's popover target element.
  RefPtr<nsGenericHTMLElement> popover = GetEffectivePopoverTargetElement();

  // 2. If popover is null, then return.
  if (!popover) {
    return;
  }

  // 3. If eventTarget is a shadow-including inclusive descendant of popover and
  // popover is a shadow-including descendant of node, then return.
  if (aEventTarget &&
      aEventTarget->IsShadowIncludingInclusiveDescendantOf(popover) &&
      popover->IsShadowIncludingDescendantOf(this)) {
    return;
  }

  // 4. If node's popovertargetaction attribute is in the show state and
  // popover's popover visibility state is showing, then return.
  // 5. If node's popovertargetaction attribute is in the hide state and
  // popover's popover visibility state is hidden, then return.
  // 6. If popover's popover visibility state is showing, then run the hide
  // popover algorithm given popover, true, true, false, and node.
  // 7. Otherwise, if popover's popover visibility state is hidden and the
  // result of running check popover validity given popover, false, false, and
  // null is true, then run show popover given popover, false, and node.
  auto action = PopoverTargetAction::Toggle;
  if (const nsAttrValue* value =
          GetParsedAttr(nsGkAtoms::popovertargetaction)) {
    MOZ_ASSERT(value->Type() == nsAttrValue::eEnum);
    action = static_cast<PopoverTargetAction>(value->GetEnumValue());
  }

  bool canHide = action == PopoverTargetAction::Hide ||
                 action == PopoverTargetAction::Toggle;
  bool shouldHide = canHide && popover->IsPopoverOpen();
  bool canShow = action == PopoverTargetAction::Show ||
                 action == PopoverTargetAction::Toggle;
  bool shouldShow = canShow && !popover->IsPopoverOpen();

  if (shouldHide) {
    popover->HidePopoverInternal(true, true, this, IgnoreErrors());
  } else if (shouldShow) {
    popover->ShowPopoverInternal(this, IgnoreErrors());
  }
}

bool nsGenericHTMLElement::IsValidCommandAction(Command aCommand) const {
  return Element::IsValidCommandAction(aCommand) ||
         aCommand == Command::ShowPopover ||
         aCommand == Command::TogglePopover || aCommand == Command::HidePopover;
}

MOZ_CAN_RUN_SCRIPT bool nsGenericHTMLElement::HandleCommandInternal(
    Element* aSource, Command aCommand, ErrorResult& aRv) {
  if (Element::HandleCommandInternal(aSource, aCommand, aRv)) {
    return true;
  }

  // If the element is a `popover` then we may want to handle the
  // command...
  auto popoverState = GetPopoverAttributeState();
  if (popoverState == PopoverAttributeState::None) {
    return false;
  }

  const bool canShow =
      aCommand == Command::TogglePopover || aCommand == Command::ShowPopover;
  const bool canHide =
      aCommand == Command::TogglePopover || aCommand == Command::HidePopover;

  if (canShow && !IsPopoverOpen()) {
    ShowPopoverInternal(aSource, aRv);
    return true;
  }

  if (canHide && IsPopoverOpen()) {
    HidePopoverInternal(/* aFocusPreviousElement = */ true,
                        /* aFireEvents = */ true, aSource, IgnoreErrors());
    return true;
  }

  return false;
}

void nsGenericHTMLFormControlElementWithState::GenerateStateKey() {
  // Keep the key if already computed
  if (!mStateKey.IsVoid()) {
    return;
  }

  Document* doc = GetUncomposedDoc();
  if (!doc) {
    mStateKey.Truncate();
    return;
  }

  // Generate the state key
  nsContentUtils::GenerateStateKey(this, doc, mStateKey);

  // If the state key is blank, this is anonymous content or for whatever
  // reason we are not supposed to save/restore state: keep it as such.
  if (!mStateKey.IsEmpty()) {
    // Add something unique to content so layout doesn't muck us up.
    mStateKey += "-C";
  }
}

PresState* nsGenericHTMLFormControlElementWithState::GetPrimaryPresState() {
  if (mStateKey.IsEmpty()) {
    return nullptr;
  }

  nsCOMPtr<nsILayoutHistoryState> history = GetLayoutHistory(false);

  if (!history) {
    return nullptr;
  }

  // Get the pres state for this key, if it doesn't exist, create one.
  PresState* result = history->GetState(mStateKey);
  if (!result) {
    UniquePtr<PresState> newState = NewPresState();
    result = newState.get();
    history->AddState(mStateKey, std::move(newState));
  }

  return result;
}

already_AddRefed<nsILayoutHistoryState>
nsGenericHTMLFormElement::GetLayoutHistory(bool aRead) {
  nsCOMPtr<Document> doc = GetUncomposedDoc();
  if (!doc) {
    return nullptr;
  }

  //
  // Get the history
  //
  nsCOMPtr<nsILayoutHistoryState> history = doc->GetLayoutHistoryState();
  if (!history) {
    return nullptr;
  }

  if (aRead && !history->HasStates()) {
    return nullptr;
  }

  return history.forget();
}

bool nsGenericHTMLFormControlElementWithState::RestoreFormControlState() {
  MOZ_ASSERT(!mStateKey.IsVoid(),
             "GenerateStateKey must already have been called");

  if (mStateKey.IsEmpty()) {
    return false;
  }

  nsCOMPtr<nsILayoutHistoryState> history = GetLayoutHistory(true);
  if (!history) {
    return false;
  }

  // Take ownership of the pres state for this key: RestoreState() can run
  // script (e.g. by synchronously committing an IME composition), which may
  // re-enter restoration for the same key and free a table-owned state while
  // we are still using it.
  UniquePtr<PresState> state = history->TakeState(mStateKey);
  if (state) {
    return RestoreState(state.get());
  }

  return false;
}

void nsGenericHTMLFormControlElementWithState::NodeInfoChanged(
    Document* aOldDoc) {
  nsGenericHTMLFormControlElement::NodeInfoChanged(aOldDoc);

  // We need to regenerate the state key now we're in a new document.  Clearing
  // mControlNumber means we stop considering this control to be parser
  // inserted, and we'll generate a state key based on its position in the
  // document rather than the order it was inserted into the document.
  mControlNumber = -1;
  mStateKey.SetIsVoid(true);
}

void nsGenericHTMLFormControlElementWithState::GetFormAction(nsString& aValue) {
  auto type = ControlType();
  if (!IsInputElement(type) && !IsButtonElement(type)) {
    return;
  }

  if (!GetAttr(nsGkAtoms::formaction, aValue) || aValue.IsEmpty()) {
    Document* document = OwnerDoc();
    nsIURI* docURI = document->GetDocumentURI();
    if (docURI) {
      nsAutoCString spec;
      nsresult rv = docURI->GetSpec(spec);
      if (NS_FAILED(rv)) {
        return;
      }

      CopyUTF8toUTF16(spec, aValue);
    }
  } else {
    GetURIAttr(nsGkAtoms::formaction, nullptr, aValue);
  }
}

bool nsGenericHTMLElement::IsEventAttributeNameInternal(nsAtom* aName) {
  return nsContentUtils::IsEventAttributeName(aName, EventNameType_HTML);
}

/**
 * Construct a URI from a string, as an element.src attribute
 * would be set to. Helper for the media elements.
 */
nsresult nsGenericHTMLElement::NewURIFromString(const nsAString& aURISpec,
                                                nsIURI** aURI) {
  NS_ENSURE_ARG_POINTER(aURI);

  *aURI = nullptr;

  nsCOMPtr<Document> doc = OwnerDoc();

  nsresult rv = nsContentUtils::NewURIWithDocumentCharset(aURI, aURISpec, doc,
                                                          GetBaseURI());
  NS_ENSURE_SUCCESS(rv, rv);

  bool equal;
  if (aURISpec.IsEmpty() && doc->GetDocumentURI() &&
      NS_SUCCEEDED(doc->GetDocumentURI()->Equals(*aURI, &equal)) && equal) {
    // Assume an element can't point to a fragment of its embedding
    // document. Fail here instead of returning the recursive URI
    // and waiting for the subsequent load to fail.
    NS_RELEASE(*aURI);
    return NS_ERROR_DOM_INVALID_STATE_ERR;
  }

  return NS_OK;
}

void nsGenericHTMLElement::GetInnerText(mozilla::dom::DOMString& aValue,
                                        mozilla::ErrorResult& aError) {
  // innerText depends on layout. For example, white space processing is
  // something that happens during reflow and which must be reflected by
  // innerText.  So for:
  //
  //   <div style="white-space:normal"> A     B C </div>
  //
  // innerText should give "A B C".
  //
  // The approach taken here to avoid the expense of reflow is to flush style
  // and then see whether it's necessary to flush layout afterwards. Flushing
  // layout can be skipped if we can detect that the element or its descendants
  // are not dirty.

  // Obtain the composed doc to handle elements in Shadow DOM.
  Document* doc = GetComposedDoc();
  if (doc) {
    doc->FlushPendingNotifications(FlushType::Style);
  }

  // Elements with `display: content` will not have a frame. To handle Shadow
  // DOM, walk the flattened tree looking for parent frame.
  nsIFrame* frame = GetPrimaryFrame();
  if (IsDisplayContents()) {
    for (Element* parent = GetFlattenedTreeParentElement(); parent;
         parent = parent->GetFlattenedTreeParentElement()) {
      frame = parent->GetPrimaryFrame();
      if (frame) {
        break;
      }
    }
  }

  // Check for dirty reflow roots in the subtree from targetFrame; this requires
  // a reflow flush.
  bool dirty = frame && frame->PresShell()->FrameIsAncestorOfDirtyRoot(frame);

  // The way we do that is by checking whether the element has either of the two
  // dirty bits (NS_FRAME_IS_DIRTY or NS_FRAME_HAS_DIRTY_DESCENDANTS) or if any
  // ancestor has NS_FRAME_IS_DIRTY.  We need to check for NS_FRAME_IS_DIRTY on
  // ancestors since that is something that implies NS_FRAME_IS_DIRTY on all
  // descendants.
  dirty |= frame && frame->HasAnyStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
  while (!dirty && frame) {
    dirty |= frame->HasAnyStateBits(NS_FRAME_IS_DIRTY);
    frame = frame->GetInFlowParent();
  }

  // Flush layout if we determined a reflow is required.
  if (dirty && doc) {
    doc->FlushPendingNotifications(FlushType::Layout);
  }

  if (!IsRendered()) {
    GetTextContentInternal(aValue, aError);
  } else {
    nsRange::GetInnerTextNoFlush(aValue, aError, this);
  }
}

static already_AddRefed<nsINode> TextToNode(const nsAString& aString,
                                            nsNodeInfoManager* aNim) {
  nsString str;
  const char16_t* s = aString.BeginReading();
  const char16_t* end = aString.EndReading();
  RefPtr<DocumentFragment> fragment;
  while (true) {
    if (s != end && *s == '\r' && s + 1 != end && s[1] == '\n') {
      // a \r\n pair should only generate one <br>, so just skip the \r
      ++s;
    }
    if (s == end || *s == '\r' || *s == '\n') {
      if (!str.IsEmpty()) {
        RefPtr<nsTextNode> textContent = new (aNim) nsTextNode(aNim);
        textContent->SetText(str, true);
        if (!fragment) {
          if (s == end) {
            return textContent.forget();
          }
          fragment = new (aNim) DocumentFragment(aNim);
        }
        fragment->AppendChildTo(textContent, true, IgnoreErrors());
      }
      if (s == end) {
        break;
      }
      str.Truncate();
      RefPtr<NodeInfo> ni = aNim->GetNodeInfo(
          nsGkAtoms::br, nullptr, kNameSpaceID_XHTML, nsINode::ELEMENT_NODE);
      auto* nim = ni->NodeInfoManager();
      RefPtr<HTMLBRElement> br = new (nim) HTMLBRElement(ni.forget());
      if (!fragment) {
        if (s + 1 == end) {
          return br.forget();
        }
        fragment = new (aNim) DocumentFragment(aNim);
      }
      fragment->AppendChildTo(br, true, IgnoreErrors());
    } else {
      str.Append(*s);
    }
    ++s;
  }
  return fragment.forget();
}

void nsGenericHTMLElement::SetInnerTextInternal(
    const nsAString& aValue, MutationEffectOnScript aMutationEffectOnScript) {
  RefPtr<nsINode> node = TextToNode(aValue, NodeInfo()->NodeInfoManager());
  ReplaceChildren(node, IgnoreErrors(), aMutationEffectOnScript);
}

// https://html.spec.whatwg.org/#merge-with-the-next-text-node
static void MergeWithNextTextNode(Text& aText, ErrorResult& aRv) {
  RefPtr<Text> nextSibling = Text::FromNodeOrNull(aText.GetNextSibling());
  if (!nextSibling) {
    return;
  }
  nsAutoString data;
  nextSibling->GetData(data);
  aText.AppendDataInternal(data, MutationEffectOnScript::KeepTrustWorthiness,
                           aRv);
  nextSibling->Remove();
}

// https://html.spec.whatwg.org/#dom-outertext
void nsGenericHTMLElement::SetOuterText(const nsAString& aValue,
                                        ErrorResult& aRv) {
  nsCOMPtr<nsINode> parent = GetParentNode();
  if (!parent) {
    return aRv.ThrowNoModificationAllowedError("Element has no parent");
  }

  RefPtr<nsINode> next = GetNextSibling();
  RefPtr<nsINode> previous = GetPreviousSibling();

  nsNodeInfoManager* nim = NodeInfo()->NodeInfoManager();
  RefPtr<nsINode> node = TextToNode(aValue, nim);
  if (!node) {
    // This doesn't match the spec, see
    // https://github.com/whatwg/html/issues/7508
    node = new (nim) nsTextNode(nim);
  }
  parent->ReplaceChildInternal(
      *node, *this, MutationEffectOnScript::DropTrustWorthiness, aRv);
  if (aRv.Failed()) {
    return;
  }

  if (next) {
    if (RefPtr<Text> text = Text::FromNodeOrNull(next->GetPreviousSibling())) {
      MergeWithNextTextNode(*text, aRv);
      if (aRv.Failed()) {
        return;
      }
    }
  }
  if (auto* text = Text::FromNodeOrNull(previous)) {
    MergeWithNextTextNode(*text, aRv);
  }
}

// This should be true when `:open` should match.
bool nsGenericHTMLElement::PopoverOpen() const {
  if (PopoverData* popoverData = GetPopoverData()) {
    return popoverData->GetPopoverVisibilityState() ==
           PopoverVisibilityState::Showing;
  }
  return false;
}

// https://html.spec.whatwg.org/#check-popover-validity
bool nsGenericHTMLElement::CheckPopoverValidity(
    PopoverVisibilityState aExpectedState, Document* aExpectedDocument,
    ErrorResult& aRv) {
  // 1. If element's popover attribute is in the No Popover state, then:
  if (GetPopoverAttributeState() == PopoverAttributeState::None) {
    // 1. If throwExceptions is true, then throw a "NotSupportedError"
    //    DOMException.
    aRv.ThrowNotSupportedError("Element is in the no popover state");
    // 2. Return false.
    return false;
  }

  // 2. If any of the following are true:
  //  - expectedToBeShowing is true and element's popover visibility state is
  //    not showing; or
  //  - expectedToBeShowing is false and element's popover visibility state is
  //    not hidden,
  if (GetPopoverData()->GetPopoverVisibilityState() != aExpectedState) {
    // then return false.
    return false;
  }

  // 3. If any of the following are true:
  //   - element is not connected;
  if (!IsInComposedDoc()) {
    // 1. If throwExceptions is true, then throw an "InvalidStateError"
    //    DOMException.
    aRv.ThrowInvalidStateError("Element is not connected");
    // 2. Return false.
    return false;
  }

  //   - element's node document is not fully active;
  if (!OwnerDoc()->IsFullyActive()) {
    aRv.ThrowInvalidStateError("Element's document is not fully active");
    return false;
  }

  //   - expectedDocument is not null and element's node document is not
  //     expectedDocument;
  if (aExpectedDocument && aExpectedDocument != OwnerDoc()) {
    aRv.ThrowInvalidStateError("Element is moved to other document");
    return false;
  }

  //  - element is a dialog element and its is modal is set to true; or
  if (auto* dialog = HTMLDialogElement::FromNode(this)) {
    if (dialog->IsInTopLayer()) {
      aRv.ThrowInvalidStateError("Element is a modal <dialog> element");
      return false;
    }
  }

  //  - element's fullscreen flag is set,
  if (State().HasState(ElementState::FULLSCREEN)) {
    aRv.ThrowInvalidStateError("Element is fullscreen");
    return false;
  }

  return true;
}

PopoverAttributeState nsGenericHTMLElement::GetPopoverAttributeState() const {
  return GetPopoverData() ? GetPopoverData()->GetPopoverAttributeState()
                          : PopoverAttributeState::None;
}

void nsGenericHTMLElement::PopoverPseudoStateUpdate(bool aOpen, bool aNotify) {
  SetStates(ElementState::POPOVER_OPEN, aOpen, aNotify);
}

already_AddRefed<ToggleEvent> nsGenericHTMLElement::CreateToggleEvent(
    const nsAString& aEventType, const nsAString& aOldState,
    const nsAString& aNewState, Cancelable aCancelable, Element* aSource) {
  ToggleEventInit init;
  init.mBubbles = false;
  init.mOldState = aOldState;
  init.mNewState = aNewState;
  init.mCancelable = aCancelable == Cancelable::eYes;
  RefPtr<ToggleEvent> event = ToggleEvent::Constructor(this, aEventType, init);
  event->SetTrusted(true);
  event->SetTarget(this);
  event->SetSource(aSource);
  return event.forget();
}

bool nsGenericHTMLElement::FireToggleEvent(const nsAString& aOldState,
                                           const nsAString& aNewState,
                                           const nsAString& aType,
                                           Element* aSource) {
  const auto cancelable = aType == u"beforetoggle"_ns && aNewState == u"open"_ns
                              ? Cancelable::eYes
                              : Cancelable::eNo;
  RefPtr event =
      CreateToggleEvent(aType, aOldState, aNewState, cancelable, aSource);
  EventDispatcher::DispatchDOMEvent(this, nullptr, event, nullptr, nullptr);
  return event->DefaultPrevented();
}

// https://html.spec.whatwg.org/#queue-a-popover-toggle-event-task
void nsGenericHTMLElement::QueuePopoverEventTask(
    PopoverVisibilityState aOldState, Element* aSource) {
  PopoverVisibilityState newState = aOldState == PopoverVisibilityState::Hidden
                                        ? PopoverVisibilityState::Showing
                                        : PopoverVisibilityState::Hidden;
  auto* data = GetPopoverData();
  MOZ_ASSERT(data, "Should have popover data");

  if (auto* queuedToggleEventTask = data->GetToggleEventTask()) {
    aOldState = queuedToggleEventTask->GetOldState();
  }

  auto task = MakeRefPtr<PopoverToggleEventTask>(do_GetWeakReference(this),
                                                 do_GetWeakReference(aSource),
                                                 aOldState, newState);
  data->SetToggleEventTask(task);
  OwnerDoc()->Dispatch(task.forget());
}

void nsGenericHTMLElement::RunPopoverToggleEventTask(
    PopoverToggleEventTask* aTask, Element* aSource) {
  auto* data = GetPopoverData();
  if (!data) {
    return;
  }

  auto* popoverToggleEventTask = data->GetToggleEventTask();
  if (!popoverToggleEventTask || aTask != popoverToggleEventTask) {
    return;
  }
  auto oldState = aTask->GetOldState();
  auto newState = aTask->GetNewState();
  data->ClearToggleEventTask();
  // Intentionally ignore the return value here as only on open event the
  // cancelable attribute is initialized to true for beforetoggle event.
  auto stringForState = [](PopoverVisibilityState state) {
    return state == PopoverVisibilityState::Hidden ? u"closed"_ns : u"open"_ns;
  };
  FireToggleEvent(stringForState(oldState), stringForState(newState),
                  u"toggle"_ns, aSource);
}

// https://html.spec.whatwg.org/#dom-showpopover
void nsGenericHTMLElement::ShowPopover(const ShowPopoverOptions& aOptions,
                                       ErrorResult& aRv) {
  Element* source = nullptr;
  if (aOptions.mSource.WasPassed()) {
    source = &aOptions.mSource.Value();
  }
  return ShowPopoverInternal(MOZ_KnownLive(source), aRv);
}

// https://html.spec.whatwg.org/#show-popover
void nsGenericHTMLElement::ShowPopoverInternal(Element* aSource,
                                               ErrorResult& aRv) {
  // 1. Let document be element's node document.
  RefPtr<Document> document = OwnerDoc();

  // 2. If document's showing popover is true, or document's hiding popover
  // nesting count is not 0, then throw an InvalidStateError.
  if (document->IsShowingPopover() ||
      document->HidingPopoverNestingCount() != 0) {
    aRv.ThrowInvalidStateError(
        "Cannot show a popover during the show or hide of another popover.");
    return;
  }

  // 3. Let validityResult be the result of running check popover validity
  // given element, false, and null.
  // 4. If validityResult is false, then return.
  if (!CheckPopoverValidity(PopoverVisibilityState::Hidden, nullptr, aRv)) {
    return;
  }

  // 5. Set document's showing popover to true.
  document->SetShowingPopover(true);

  // 6. Assert: element's popover trigger is null.
  MOZ_ASSERT(!GetPopoverData() || !GetPopoverData()->GetInvoker());

  // 7. Assert: element is not in document's top layer.
  MOZ_ASSERT(!OwnerDoc()->TopLayerContains(*this));

  // 8. Let cleanupShowingSteps be the following steps:
  auto cleanupShowingSteps =
      MakeScopeExit([&]() { document->SetShowingPopover(false); });

  // 9. If the result of firing an event named beforetoggle, using ToggleEvent,
  // with the cancelable attribute initialized to true, the oldState attribute
  // initialized to "closed", the newState attribute initialized to "open", and
  // the source attribute initialized to source at element is false, then run
  // cleanupShowingSteps and return.
  if (FireToggleEvent(u"closed"_ns, u"open"_ns, u"beforetoggle"_ns, aSource)) {
    return;
  }

  // 10. Set validityResult to the result of running check popover validity
  // given element, false, and document.
  // 11. If validityResult is not true, run cleanupShowingSteps and return.
  if (!CheckPopoverValidity(PopoverVisibilityState::Hidden, document, aRv)) {
    return;
  }

  // 12. Let shouldRestoreFocus be false.
  bool shouldRestoreFocus = false;

  // 13. Let originalType be the current state of element's popover attribute.
  auto originalType = GetPopoverAttributeState();

  // 14. Let ancestor be the result of running topmost popover ancestor given
  // element, source, and true.
  RefPtr<Element> ancestor = GetTopmostPopoverAncestor(aSource, true);

  // 15. Let effectiveType be originalType.
  auto effectiveType = originalType;

  // 16. If ancestor is not null, ancestor's opened in popover mode is "hint",
  // and effectiveType is Auto, then set effectiveType to Hint.
  if (ancestor && effectiveType == PopoverAttributeState::Auto) {
    auto* ancestorHTML = nsGenericHTMLElement::FromNode(ancestor);
    if (ancestorHTML && ancestorHTML->GetPopoverData() &&
        ancestorHTML->GetPopoverData()->GetOpenedInMode() ==
            PopoverAttributeState::Hint) {
      effectiveType = PopoverAttributeState::Hint;
    }
  }

  // 17. If effectiveType is Auto or Hint, run hide popover stack until given
  // document, ancestor, Hint, shouldRestoreFocus, and true.
  if (effectiveType == PopoverAttributeState::Auto ||
      effectiveType == PopoverAttributeState::Hint) {
    document->HidePopoverStackUntil(ancestor, PopoverAttributeState::Hint,
                                    shouldRestoreFocus, true);
  }

  // 18. If effectiveType is Auto, run hide popover stack until given document,
  // ancestor, Auto, shouldRestoreFocus, and true.
  if (effectiveType == PopoverAttributeState::Auto) {
    document->HidePopoverStackUntil(ancestor, PopoverAttributeState::Auto,
                                    shouldRestoreFocus, true);
  }

  // 19. If effectiveType is Auto or Hint, then:
  if (effectiveType == PopoverAttributeState::Auto ||
      effectiveType == PopoverAttributeState::Hint) {
    // 19.1. If originalType is not equal to element's popover attribute state,
    // run cleanupShowingSteps and throw InvalidStateError.
    if (originalType != GetPopoverAttributeState()) {
      aRv.ThrowInvalidStateError(
          "The value of the popover attribute was changed while hiding the "
          "popover.");
      return;
    }
    // 19.2. Set validityResult to the result of running check popover validity
    // given element, false, and document.
    // 19.3. If validityResult is not true, run cleanupShowingSteps and return.
    if (!CheckPopoverValidity(PopoverVisibilityState::Hidden, document, aRv)) {
      return;
    }
    // Re-compute ancestor after hiding.
    ancestor = GetTopmostPopoverAncestor(aSource, true);
    // 19.4. If topmost auto or hint popover on document is null, set
    // shouldRestoreFocus to true.
    shouldRestoreFocus =
        !document->GetTopmostPopoverOf(PopoverAttributeState::Auto) &&
        !document->GetTopmostPopoverOf(PopoverAttributeState::Hint);

    // 19.5. If effectiveType is Auto:
    if (effectiveType == PopoverAttributeState::Auto) {
      // 19.5.1. Assert: document's showing auto popover list does not contain
      // element.
      MOZ_ASSERT(
          !document->PopoverListOf(PopoverAttributeState::Auto).Contains(this));
      // 19.5.2. Set element's opened in popover mode to "auto".
      GetPopoverData()->SetOpenedInMode(PopoverAttributeState::Auto);
    } else {
      // Otherwise:
      // 19.5.1. Assert: effectiveType is Hint.
      MOZ_ASSERT(effectiveType == PopoverAttributeState::Hint);
      // 19.5.2. Assert: document's showing hint popover list does not contain
      // element.
      MOZ_ASSERT(
          !document->PopoverListOf(PopoverAttributeState::Hint).Contains(this));
      // 19.5.3. Set element's opened in popover mode to "hint".
      GetPopoverData()->SetOpenedInMode(PopoverAttributeState::Hint);
    }
    // 19.6. Set element's popover close watcher.
    if (StaticPrefs::dom_closewatcher_enabled()) {
      GetPopoverData()->EnsureCloseWatcher(this);
    }
  }

  // 20. Set element's previously focused element to null.
  // 21. Let originallyFocusedElement be document's focused area of the
  // document's DOM anchor.
  if (auto* popoverData = GetPopoverData()) {
    popoverData->SetPreviouslyFocusedElement(nullptr);
  }

  nsWeakPtr originallyFocusedElement;
  if (nsIContent* unretargetedFocus =
          document->GetUnretargetedFocusedContent()) {
    originallyFocusedElement =
        do_GetWeakReference(unretargetedFocus->AsElement());
  }

  // 22. Add an element to the top layer given element.
  document->AddPopoverToTopLayer(*this);

  PopoverPseudoStateUpdate(true, true);

  // 23. If effectiveType is Hint and ancestor's opened in popover mode is
  // "auto", set document's hint stack parent to ancestor.
  if (effectiveType == PopoverAttributeState::Hint && ancestor) {
    auto* ancestorHTML = nsGenericHTMLElement::FromNode(ancestor);
    if (ancestorHTML && ancestorHTML->GetPopoverData() &&
        ancestorHTML->GetPopoverData()->GetOpenedInMode() ==
            PopoverAttributeState::Auto) {
      document->SetPopoverHintStackParent(ancestor);
    }
  }

  {
    auto* popoverData = GetPopoverData();
    // 24. Set element's popover visibility state to showing.
    popoverData->SetPopoverVisibilityState(PopoverVisibilityState::Showing);
    // 25. Set element's popover trigger to source.
    popoverData->SetInvoker(aSource);
    // 26. Set element's implicit anchor element to source.
    if (aSource && aSource->IsHTMLElement()) {
      aSource->SetAssociatedPopover(*this);
      if (auto* select = HTMLSelectElement::FromNode(aSource)) {
        select->OnPopoverStateChanged(true);
      }
    }
  }

  // 27. Run the popover focusing steps given element.
  FocusPopover();

  // 28. If shouldRestoreFocus is true and element's popover attribute is not
  // in the No Popover state, then set element's previously focused element to
  // originallyFocusedElement.
  if (shouldRestoreFocus &&
      GetPopoverAttributeState() != PopoverAttributeState::None) {
    GetPopoverData()->SetPreviouslyFocusedElement(originallyFocusedElement);
  }

  // 29. Run cleanupShowingSteps.
  cleanupShowingSteps.release();
  document->SetShowingPopover(false);

  // 30. Queue a popover toggle event task given element, "closed", "open", and
  // source.
  QueuePopoverEventTask(PopoverVisibilityState::Hidden, aSource);
}

void nsGenericHTMLElement::HidePopoverWithoutRunningScript() {
  HidePopoverInternal(/* aFocusPreviousElement = */ false,
                      /* aFireEvents = */ false,
                      /* aSource = */ nullptr, IgnoreErrors());
}

// https://html.spec.whatwg.org/#dom-hidepopover
void nsGenericHTMLElement::HidePopover(ErrorResult& aRv) {
  HidePopoverInternal(/* aFocusPreviousElement = */ true,
                      /* aFireEvents = */ true,
                      /* aSource = */ nullptr, aRv);
}

void nsGenericHTMLElement::HidePopoverInternal(bool aFocusPreviousElement,
                                               bool aFireEvents,
                                               mozilla::dom::Element* aSource,
                                               ErrorResult& aRv) {
  OwnerDoc()->HidePopover(*this, aFocusPreviousElement, aFireEvents, aSource,
                          aRv);
}

void nsGenericHTMLElement::ForgetPreviouslyFocusedElementAfterHidingPopover() {
  auto* data = GetPopoverData();
  MOZ_ASSERT(data, "Should have popover data");
  data->SetPreviouslyFocusedElement(nullptr);
}

void nsGenericHTMLElement::FocusPreviousElementAfterHidingPopover() {
  auto* data = GetPopoverData();
  MOZ_ASSERT(data, "Should have popover data");

  RefPtr<Element> control =
      do_QueryReferent(data->GetPreviouslyFocusedElement().get());
  data->SetPreviouslyFocusedElement(nullptr);

  if (!control) {
    return;
  }

  // Step 14.2 at
  // https://html.spec.whatwg.org/multipage/popover.html#hide-popover-algorithm
  // If focusPreviousElement is true and document's focused area of the
  // document's DOM anchor is a shadow-including inclusive descendant of
  // element, then run the focusing steps for previouslyFocusedElement;
  nsIContent* currentFocus = OwnerDoc()->GetUnretargetedFocusedContent();
  if (currentFocus &&
      currentFocus->IsShadowIncludingInclusiveDescendantOf(this)) {
    FocusOptions options;
    options.mPreventScroll = true;
    control->Focus(options, CallerType::NonSystem, IgnoreErrors());
  }
}

// https://html.spec.whatwg.org/multipage/popover.html#dom-togglepopover
bool nsGenericHTMLElement::TogglePopover(
    const TogglePopoverOptionsOrBoolean& aOptions, ErrorResult& aRv) {
  std::optional<bool> force;
  // Kept alive by TogglePopoverOptions if non-null.
  Element* invoker = nullptr;

  if (aOptions.IsBoolean()) {
    force = std::make_optional(aOptions.GetAsBoolean());
  } else {
    const auto& options = aOptions.GetAsTogglePopoverOptions();
    if (options.mForce.WasPassed()) {
      force = std::make_optional(options.mForce.Value());
    }
    if (options.mSource.WasPassed()) {
      invoker = &options.mSource.Value();
    }
  }

  if (PopoverOpen() && !force.value_or(false)) {
    HidePopover(aRv);
  } else if (force.value_or(true)) {
    // Kept alive by TogglePopoverOptions.
    ShowPopoverInternal(MOZ_KnownLive(invoker), aRv);
  } else {
    CheckPopoverValidity(GetPopoverData()
                             ? GetPopoverData()->GetPopoverVisibilityState()
                             : PopoverVisibilityState::Showing,
                         nullptr, aRv);
  }

  return PopoverOpen();
}

// https://html.spec.whatwg.org/multipage/popover.html#popover-focusing-steps
void nsGenericHTMLElement::FocusPopover() {
  if (auto* dialog = HTMLDialogElement::FromNode(this)) {
    return MOZ_KnownLive(dialog)->FocusDialog();
  }

  if (RefPtr<Document> doc = GetComposedDoc()) {
    doc->FlushPendingNotifications(FlushType::Frames);
  }

  RefPtr<Element> control = GetBoolAttr(nsGkAtoms::autofocus)
                                ? this
                                : GetAutofocusDelegate(IsFocusableFlags(0));
  if (!control) {
    return;
  }
  FocusCandidate(control, false /* aClearUpFocus */);
}

void nsGenericHTMLElement::FocusCandidate(Element* aControl,
                                          bool aClearUpFocus) {
  // 1) Run the focusing steps given control.
  IgnoredErrorResult rv;
  if (RefPtr<Element> elementToFocus = nsFocusManager::GetTheFocusableArea(
          aControl, nsFocusManager::ProgrammaticFocusFlags(FocusOptions()))) {
    elementToFocus->Focus(FocusOptions(), CallerType::NonSystem, rv);
    if (rv.Failed()) {
      return;
    }
  } else if (aClearUpFocus) {
    if (RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager()) {
      // Clear the focus which ends up making the body gets focused
      nsCOMPtr<nsPIDOMWindowOuter> outerWindow = OwnerDoc()->GetWindow();
      fm->ClearFocus(outerWindow);
    }
  }

  // 2) Let topDocument be the active document of control's node document's
  // browsing context's top-level browsing context.
  // 3) If control's node document's origin is not the same as the origin of
  // topDocument, then return.
  BrowsingContext* bc = aControl->OwnerDoc()->GetBrowsingContext();
  if (bc && bc->IsInProcess() && bc->SameOriginWithTop()) {
    if (nsCOMPtr<nsIDocShell> docShell = bc->Top()->GetDocShell()) {
      if (Document* topDocument = docShell->GetExtantDocument()) {
        // 4) Empty topDocument's autofocus candidates.
        // 5) Set topDocument's autofocus processed flag to true.
        topDocument->SetAutoFocusFired();
      }
    }
  }
}

already_AddRefed<ElementInternals> nsGenericHTMLElement::AttachInternals(
    ErrorResult& aRv) {
  // ElementInternals is only available on autonomous custom element, so
  // throws an error by default. The spec steps are implemented in HTMLElement
  // because ElementInternals needs to hold a pointer to HTMLElement in order
  // to forward form operation to it.
  aRv.ThrowNotSupportedError(nsPrintfCString(
      "Cannot attach ElementInternals to a customized built-in or non-custom "
      "element "
      "'%s'",
      NS_ConvertUTF16toUTF8(NodeInfo()->NameAtom()->GetUTF16String()).get()));
  return nullptr;
}

ElementInternals* nsGenericHTMLElement::GetInternals() const {
  if (CustomElementData* data = GetCustomElementData()) {
    return data->GetElementInternals();
  }
  return nullptr;
}

bool nsGenericHTMLElement::IsFormAssociatedCustomElement() const {
  CustomElementData* data = GetCustomElementData();
  return data && data->IsFormAssociated();
}

void nsGenericHTMLElement::GetAutocapitalize(nsAString& aValue) const {
  // https://html.spec.whatwg.org/#dom-autocapitalize
  // 1. Let state be the own autocapitalization hint of this.
  const auto* attr = GetParsedAttr(nsGkAtoms::autocapitalize);
  if (attr && attr->Type() == nsAttrValue::eEnum) {
    auto enumValue = attr->GetEnumValue();
    if (enumValue == NS_AUTOCAPITALIZE_OFF ||
        enumValue == NS_AUTOCAPITALIZE_NONE) {
      // 3. If state is None, then return "none".
      aValue.AssignLiteral("none");
      return;
    }
    if (enumValue == NS_AUTOCAPITALIZE_ON ||
        enumValue == NS_AUTOCAPITALIZE_SENTENCES) {
      // 4. If state is Sentences, then return "sentences".
      aValue.AssignLiteral("sentences");
      return;
    }
  }
  // 2. If state is Default, then return the empty string.
  // 5. Return the keyword value corresponding to state.
  GetEnumAttr(nsGkAtoms::autocapitalize, nullptr, kDefaultAutocapitalize->tag,
              aValue);
}

bool nsGenericHTMLElement::Translate() const {
  if (const nsAttrValue* attr = mAttrs.GetAttr(nsGkAtoms::translate)) {
    if (attr->IsEmptyString() || attr->Equals(nsGkAtoms::yes, eIgnoreCase)) {
      return true;
    }
    if (attr->Equals(nsGkAtoms::no, eIgnoreCase)) {
      return false;
    }
  }
  return nsGenericHTMLElementBase::Translate();
}

void nsGenericHTMLElement::GetPopover(nsString& aPopover) const {
  GetHTMLEnumAttr(nsGkAtoms::popover, aPopover);
  if (aPopover.IsEmpty() && !DOMStringIsNull(aPopover)) {
    aPopover.Assign(NS_ConvertUTF8toUTF16(kPopoverAttributeValueAuto));
  }
}

/******************************************************************************
 *  nsIFormControl
 *****************************************************************************/

// static
nsIFormControl* nsIFormControl::FromEventTarget(
    mozilla::dom::EventTarget* aTarget) {
  MOZ_ASSERT(aTarget);
  return aTarget->IsNode() ? aTarget->AsNode()->GetAsFormControl() : nullptr;
}

// static
nsIFormControl* nsIFormControl::FromEventTargetOrNull(
    mozilla::dom::EventTarget* aTarget) {
  return aTarget && aTarget->IsNode() ? aTarget->AsNode()->GetAsFormControl()
                                      : nullptr;
}

// static
const nsIFormControl* nsIFormControl::FromEventTarget(
    const mozilla::dom::EventTarget* aTarget) {
  MOZ_ASSERT(aTarget);
  return aTarget->IsNode() ? aTarget->AsNode()->GetAsFormControl() : nullptr;
}

// static
const nsIFormControl* nsIFormControl::FromEventTargetOrNull(
    const mozilla::dom::EventTarget* aTarget) {
  return aTarget && aTarget->IsNode() ? aTarget->AsNode()->GetAsFormControl()
                                      : nullptr;
}

// static
nsIFormControl* nsIFormControl::FromNode(nsINode* aNode) {
  MOZ_ASSERT(aNode);
  return aNode->GetAsFormControl();
}

// static
nsIFormControl* nsIFormControl::FromNodeOrNull(nsINode* aNode) {
  return aNode ? aNode->GetAsFormControl() : nullptr;
}

// static
const nsIFormControl* nsIFormControl::FromNode(const nsINode* aNode) {
  MOZ_ASSERT(aNode);
  return aNode->GetAsFormControl();
}

// static
const nsIFormControl* nsIFormControl::FromNodeOrNull(const nsINode* aNode) {
  return aNode ? aNode->GetAsFormControl() : nullptr;
}