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diff --git a/dom/html/HTMLTextAreaElement.h b/dom/html/HTMLTextAreaElement.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_HTMLTextAreaElement_h
+#define mozilla_dom_HTMLTextAreaElement_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/TextControlElement.h"
+#include "mozilla/TextControlState.h"
+#include "mozilla/TextEditor.h"
+#include "mozilla/dom/ConstraintValidation.h"
+#include "mozilla/dom/HTMLFormElement.h"
+#include "mozilla/dom/HTMLInputElementBinding.h"
+#include "nsIControllers.h"
+#include "nsCOMPtr.h"
+#include "nsGenericHTMLElement.h"
+#include "nsStubMutationObserver.h"
+#include "nsGkAtoms.h"
+
+class nsIControllers;
+class nsPresContext;
+
+namespace mozilla {
+
+class EventChainPostVisitor;
+class EventChainPreVisitor;
+class PresState;
+
+namespace dom {
+
+class FormData;
+
+class HTMLTextAreaElement final : public TextControlElement,
+                                  public nsStubMutationObserver,
+                                  public ConstraintValidation {
+ public:
+  using ConstraintValidation::GetValidationMessage;
+  using ValueSetterOption = TextControlState::ValueSetterOption;
+  using ValueSetterOptions = TextControlState::ValueSetterOptions;
+
+  explicit HTMLTextAreaElement(
+      already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+      FromParser aFromParser = NOT_FROM_PARSER);
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_IMPL_FROMNODE_HTML_WITH_TAG(HTMLTextAreaElement, textarea)
+
+  int32_t TabIndexDefault() override;
+
+  // Element
+  bool IsInteractiveHTMLContent() const override { return true; }
+
+  // nsGenericHTMLElement
+  bool IsDisabledForEvents(WidgetEvent* aEvent) override;
+
+  // nsGenericHTMLFormElement
+  void SaveState() override;
+  bool RestoreState(PresState* aState) override;
+
+  // nsIFormControl
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  NS_IMETHOD Reset() override;
+  NS_IMETHOD SubmitNamesValues(FormData* aFormData) override;
+
+  void FieldSetDisabledChanged(bool aNotify) override;
+
+  ElementState IntrinsicState() const override;
+
+  void SetLastValueChangeWasInteractive(bool);
+
+  // TextControlElement
+  void SetValueChanged(bool aValueChanged) override;
+  bool IsSingleLineTextControl() const override;
+  bool IsTextArea() const override;
+  bool IsPasswordTextControl() const override;
+  int32_t GetCols() override;
+  int32_t GetWrapCols() override;
+  int32_t GetRows() override;
+  void GetDefaultValueFromContent(nsAString& aValue) override;
+  bool ValueChanged() const override;
+  void GetTextEditorValue(nsAString& aValue, bool aIgnoreWrap) const override;
+  MOZ_CAN_RUN_SCRIPT TextEditor* GetTextEditor() override;
+  TextEditor* GetTextEditorWithoutCreation() override;
+  nsISelectionController* GetSelectionController() override;
+  nsFrameSelection* GetConstFrameSelection() override;
+  TextControlState* GetTextControlState() const override { return mState; }
+  nsresult BindToFrame(nsTextControlFrame* aFrame) override;
+  MOZ_CAN_RUN_SCRIPT void UnbindFromFrame(nsTextControlFrame* aFrame) override;
+  MOZ_CAN_RUN_SCRIPT nsresult CreateEditor() override;
+  void SetPreviewValue(const nsAString& aValue) override;
+  void GetPreviewValue(nsAString& aValue) override;
+  void EnablePreview() override;
+  bool IsPreviewEnabled() override;
+  void InitializeKeyboardEventListeners() override;
+  void OnValueChanged(ValueChangeKind, bool aNewValueEmpty,
+                      const nsAString* aKnownNewValue) override;
+  void GetValueFromSetRangeText(nsAString& aValue) override;
+  MOZ_CAN_RUN_SCRIPT nsresult
+  SetValueFromSetRangeText(const nsAString& aValue) override;
+  bool HasCachedSelection() override;
+
+  // nsIContent
+  nsresult BindToTree(BindContext&, nsINode& aParent) override;
+  void UnbindFromTree(bool aNullParent = true) override;
+  bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
+                      const nsAString& aValue,
+                      nsIPrincipal* aMaybeScriptedPrincipal,
+                      nsAttrValue& aResult) override;
+  nsMapRuleToAttributesFunc GetAttributeMappingFunction() const override;
+  nsChangeHint GetAttributeChangeHint(const nsAtom* aAttribute,
+                                      int32_t aModType) const override;
+  NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom* aAttribute) const override;
+
+  void GetEventTargetParent(EventChainPreVisitor& aVisitor) override;
+  nsresult PreHandleEvent(EventChainVisitor& aVisitor) override;
+  nsresult PostHandleEvent(EventChainPostVisitor& aVisitor) override;
+
+  bool IsHTMLFocusable(bool aWithMouse, bool* aIsFocusable,
+                       int32_t* aTabIndex) override;
+
+  void DoneAddingChildren(bool aHaveNotified) override;
+  bool IsDoneAddingChildren() override;
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+
+  nsresult CopyInnerTo(Element* aDest);
+
+  /**
+   * Called when an attribute is about to be changed
+   */
+  void BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+                     const nsAttrValue* aValue, bool aNotify) override;
+
+  // nsIMutationObserver
+  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLTextAreaElement,
+                                           TextControlElement)
+
+  // nsIConstraintValidation
+  bool IsTooLong();
+  bool IsTooShort();
+  bool IsValueMissing() const;
+  void UpdateTooLongValidityState();
+  void UpdateTooShortValidityState();
+  void UpdateValueMissingValidityState();
+  void UpdateBarredFromConstraintValidation();
+
+  // ConstraintValidation
+  nsresult GetValidationMessage(nsAString& aValidationMessage,
+                                ValidityStateType aType) override;
+
+  // Web IDL binding methods
+  void GetAutocomplete(DOMString& aValue);
+  void SetAutocomplete(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::autocomplete, aValue, aRv);
+  }
+  uint32_t Cols() { return GetUnsignedIntAttr(nsGkAtoms::cols, DEFAULT_COLS); }
+  void SetCols(uint32_t aCols, ErrorResult& aError) {
+    uint32_t cols = aCols ? aCols : DEFAULT_COLS;
+    SetUnsignedIntAttr(nsGkAtoms::cols, cols, DEFAULT_COLS, aError);
+  }
+  bool Disabled() { return GetBoolAttr(nsGkAtoms::disabled); }
+  void SetDisabled(bool aDisabled, ErrorResult& aError) {
+    SetHTMLBoolAttr(nsGkAtoms::disabled, aDisabled, aError);
+  }
+  // nsGenericHTMLFormControlElementWithState::GetForm is fine
+  using nsGenericHTMLFormControlElementWithState::GetForm;
+  int32_t MaxLength() const { return GetIntAttr(nsGkAtoms::maxlength, -1); }
+  int32_t UsedMaxLength() const final { return MaxLength(); }
+  void SetMaxLength(int32_t aMaxLength, ErrorResult& aError) {
+    int32_t minLength = MinLength();
+    if (aMaxLength < 0 || (minLength >= 0 && aMaxLength < minLength)) {
+      aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+    } else {
+      SetHTMLIntAttr(nsGkAtoms::maxlength, aMaxLength, aError);
+    }
+  }
+  int32_t MinLength() const { return GetIntAttr(nsGkAtoms::minlength, -1); }
+  void SetMinLength(int32_t aMinLength, ErrorResult& aError) {
+    int32_t maxLength = MaxLength();
+    if (aMinLength < 0 || (maxLength >= 0 && aMinLength > maxLength)) {
+      aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+    } else {
+      SetHTMLIntAttr(nsGkAtoms::minlength, aMinLength, aError);
+    }
+  }
+  void GetName(nsAString& aName) { GetHTMLAttr(nsGkAtoms::name, aName); }
+  void SetName(const nsAString& aName, ErrorResult& aError) {
+    SetHTMLAttr(nsGkAtoms::name, aName, aError);
+  }
+  void GetPlaceholder(nsAString& aPlaceholder) {
+    GetHTMLAttr(nsGkAtoms::placeholder, aPlaceholder);
+  }
+  void SetPlaceholder(const nsAString& aPlaceholder, ErrorResult& aError) {
+    SetHTMLAttr(nsGkAtoms::placeholder, aPlaceholder, aError);
+  }
+  bool ReadOnly() { return GetBoolAttr(nsGkAtoms::readonly); }
+  void SetReadOnly(bool aReadOnly, ErrorResult& aError) {
+    SetHTMLBoolAttr(nsGkAtoms::readonly, aReadOnly, aError);
+  }
+  bool Required() const { return State().HasState(ElementState::REQUIRED); }
+
+  MOZ_CAN_RUN_SCRIPT void SetRangeText(const nsAString& aReplacement,
+                                       ErrorResult& aRv);
+
+  MOZ_CAN_RUN_SCRIPT void SetRangeText(const nsAString& aReplacement,
+                                       uint32_t aStart, uint32_t aEnd,
+                                       SelectionMode aSelectMode,
+                                       ErrorResult& aRv);
+
+  void SetRequired(bool aRequired, ErrorResult& aError) {
+    SetHTMLBoolAttr(nsGkAtoms::required, aRequired, aError);
+  }
+  uint32_t Rows() {
+    return GetUnsignedIntAttr(nsGkAtoms::rows, DEFAULT_ROWS_TEXTAREA);
+  }
+  void SetRows(uint32_t aRows, ErrorResult& aError) {
+    uint32_t rows = aRows ? aRows : DEFAULT_ROWS_TEXTAREA;
+    SetUnsignedIntAttr(nsGkAtoms::rows, rows, DEFAULT_ROWS_TEXTAREA, aError);
+  }
+  void GetWrap(nsAString& aWrap) { GetHTMLAttr(nsGkAtoms::wrap, aWrap); }
+  void SetWrap(const nsAString& aWrap, ErrorResult& aError) {
+    SetHTMLAttr(nsGkAtoms::wrap, aWrap, aError);
+  }
+  void GetType(nsAString& aType);
+  void GetDefaultValue(nsAString& aDefaultValue, ErrorResult& aError) const;
+  void SetDefaultValue(const nsAString& aDefaultValue, ErrorResult& aError);
+  void GetValue(nsAString& aValue);
+  /**
+   * ValueEquals() is designed for internal use so that aValue shouldn't
+   * include \r character.  It should be handled before calling this with
+   * nsContentUtils::PlatformToDOMLineBreaks().
+   */
+  bool ValueEquals(const nsAString& aValue) const;
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void SetValue(const nsAString& aValue,
+                                            ErrorResult& aError);
+
+  uint32_t GetTextLength();
+
+  // Override SetCustomValidity so we update our state properly when it's called
+  // via bindings.
+  void SetCustomValidity(const nsAString& aError);
+
+  MOZ_CAN_RUN_SCRIPT void Select();
+  Nullable<uint32_t> GetSelectionStart(ErrorResult& aError);
+  MOZ_CAN_RUN_SCRIPT void SetSelectionStart(
+      const Nullable<uint32_t>& aSelectionStart, ErrorResult& aError);
+  Nullable<uint32_t> GetSelectionEnd(ErrorResult& aError);
+  MOZ_CAN_RUN_SCRIPT void SetSelectionEnd(
+      const Nullable<uint32_t>& aSelectionEnd, ErrorResult& aError);
+  void GetSelectionDirection(nsAString& aDirection, ErrorResult& aError);
+  MOZ_CAN_RUN_SCRIPT void SetSelectionDirection(const nsAString& aDirection,
+                                                ErrorResult& aError);
+  MOZ_CAN_RUN_SCRIPT void SetSelectionRange(
+      uint32_t aSelectionStart, uint32_t aSelectionEnd,
+      const Optional<nsAString>& aDirecton, ErrorResult& aError);
+  nsIControllers* GetControllers(ErrorResult& aError);
+  // XPCOM adapter function widely used throughout code, leaving it as is.
+  nsresult GetControllers(nsIControllers** aResult);
+
+  MOZ_CAN_RUN_SCRIPT nsIEditor* GetEditorForBindings();
+  bool HasEditor() {
+    MOZ_ASSERT(mState);
+    return !!mState->GetTextEditorWithoutCreation();
+  }
+
+  bool IsInputEventTarget() const { return true; }
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void SetUserInput(
+      const nsAString& aValue, nsIPrincipal& aSubjectPrincipal);
+
+ protected:
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY virtual ~HTMLTextAreaElement();
+
+  // get rid of the compiler warning
+  using nsGenericHTMLFormControlElementWithState::IsSingleLineTextControl;
+
+  JSObject* WrapNode(JSContext*, JS::Handle<JSObject*> aGivenProto) override;
+
+  nsCOMPtr<nsIControllers> mControllers;
+  /** Whether or not the value has changed since its default value was given. */
+  bool mValueChanged;
+  /** Whether or not the last change to the value was made interactively by the
+   * user. */
+  bool mLastValueChangeWasInteractive;
+  /** Whether or not we are already handling select event. */
+  bool mHandlingSelect;
+  /** Whether or not we are done adding children (always true if not
+      created by a parser */
+  bool mDoneAddingChildren;
+  /** Whether state restoration should be inhibited in DoneAddingChildren. */
+  bool mInhibitStateRestoration;
+  /** Whether our disabled state has changed from the default **/
+  bool mDisabledChanged;
+  /** Whether we should make :-moz-ui-invalid apply on the element. **/
+  bool mCanShowInvalidUI;
+  /** Whether we should make :-moz-ui-valid apply on the element. **/
+  bool mCanShowValidUI;
+  bool mIsPreviewEnabled;
+
+  nsContentUtils::AutocompleteAttrState mAutocompleteAttrState;
+
+  void FireChangeEventIfNeeded();
+
+  nsString mFocusedValue;
+
+  /** The state of the text editor (selection controller and the editor) **/
+  TextControlState* mState;
+
+  NS_IMETHOD SelectAll(nsPresContext* aPresContext);
+  /**
+   * Get the value, whether it is from the content or the frame.
+   * @param aValue the value [out]
+   * @param aIgnoreWrap whether to ignore the wrap attribute when getting the
+   *        value.  If this is true, linebreaks will not be inserted even if
+   *        wrap=hard.
+   */
+  void GetValueInternal(nsAString& aValue, bool aIgnoreWrap) const;
+
+  /**
+   * Setting the value.
+   *
+   * @param aValue      String to set.
+   * @param aOptions    See TextControlState::ValueSetterOption.
+   */
+  MOZ_CAN_RUN_SCRIPT nsresult
+  SetValueInternal(const nsAString& aValue, const ValueSetterOptions& aOptions);
+
+  /**
+   * Common method to call from the various mutation observer methods.
+   * aContent is a content node that's either the one that changed or its
+   * parent; we should only respond to the change if aContent is non-anonymous.
+   */
+  void ContentChanged(nsIContent* aContent);
+
+  void AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
+                    const nsAttrValue* aValue, const nsAttrValue* aOldValue,
+                    nsIPrincipal* aSubjectPrincipal, bool aNotify) override;
+
+  void SetDirectionFromValue(bool aNotify,
+                             const nsAString* aKnownValue = nullptr);
+
+  /**
+   * Return if an element should have a specific validity UI
+   * (with :-moz-ui-invalid and :-moz-ui-valid pseudo-classes).
+   *
+   * @return Whether the element should have a validity UI.
+   */
+  bool ShouldShowValidityUI() const {
+    /**
+     * Always show the validity UI if the form has already tried to be submitted
+     * but was invalid.
+     *
+     * Otherwise, show the validity UI if the element's value has been changed.
+     */
+
+    if (mForm && mForm->HasEverTriedInvalidSubmit()) {
+      return true;
+    }
+
+    return mValueChanged;
+  }
+
+  /**
+   * Get the mutable state of the element.
+   */
+  bool IsMutable() const;
+
+  /**
+   * Returns whether the current value is the empty string.
+   *
+   * @return whether the current value is the empty string.
+   */
+  bool IsValueEmpty() const {
+    return State().HasState(ElementState::VALUE_EMPTY);
+  }
+
+  /**
+   * A helper to get the current selection range.  Will throw on the ErrorResult
+   * if we have no editor state.
+   */
+  void GetSelectionRange(uint32_t* aSelectionStart, uint32_t* aSelectionEnd,
+                         ErrorResult& aRv);
+
+ private:
+  static void MapAttributesIntoRule(const nsMappedAttributes* aAttributes,
+                                    MappedDeclarations&);
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif