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diff --git a/dom/html/HTMLFormElement.h b/dom/html/HTMLFormElement.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_HTMLFormElement_h
+#define mozilla_dom_HTMLFormElement_h
+
+#include "mozilla/AsyncEventDispatcher.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/PopupBlocker.h"
+#include "mozilla/dom/RadioGroupContainer.h"
+#include "nsIFormControl.h"
+#include "nsGenericHTMLElement.h"
+#include "nsThreadUtils.h"
+#include "nsInterfaceHashtable.h"
+#include "js/friend/DOMProxy.h"  // JS::ExpandoAndGeneration
+
+class nsIMutableArray;
+class nsIURI;
+
+namespace mozilla {
+class EventChainPostVisitor;
+class EventChainPreVisitor;
+namespace dom {
+class DialogFormSubmission;
+class HTMLFormControlsCollection;
+class HTMLFormSubmission;
+class HTMLImageElement;
+class FormData;
+
+class HTMLFormElement final : public nsGenericHTMLElement {
+  friend class HTMLFormControlsCollection;
+
+ public:
+  NS_IMPL_FROMNODE_HTML_WITH_TAG(HTMLFormElement, form)
+
+  explicit HTMLFormElement(
+      already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+
+  enum { FORM_CONTROL_LIST_HASHTABLE_LENGTH = 8 };
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+
+  int32_t IndexOfContent(nsIContent* aContent);
+  nsGenericHTMLFormElement* GetDefaultSubmitElement() const;
+  bool IsDefaultSubmitElement(nsGenericHTMLFormElement* aElement) const {
+    return aElement == mDefaultSubmitElement;
+  }
+
+  // EventTarget
+  void AsyncEventRunning(AsyncEventDispatcher* aEvent) override;
+
+  /** Whether we already dispatched a DOMFormHasPassword event or not */
+  bool mHasPendingPasswordEvent = false;
+  /** Whether we already dispatched a DOMFormHasPossibleUsername event or not */
+  bool mHasPendingPossibleUsernameEvent = false;
+
+  // nsIContent
+  bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
+                      const nsAString& aValue,
+                      nsIPrincipal* aMaybeScriptedPrincipal,
+                      nsAttrValue& aResult) override;
+  void GetEventTargetParent(EventChainPreVisitor& aVisitor) override;
+  void WillHandleEvent(EventChainPostVisitor& aVisitor) override;
+  nsresult PostHandleEvent(EventChainPostVisitor& aVisitor) override;
+
+  nsresult BindToTree(BindContext&, nsINode& aParent) override;
+  void UnbindFromTree(bool aNullParent = true) override;
+  void BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
+                     const nsAttrValue* aValue, bool aNotify) override;
+
+  /**
+   * Forget all information about the current submission (and the fact that we
+   * are currently submitting at all).
+   */
+  void ForgetCurrentSubmission();
+
+  nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLFormElement,
+                                           nsGenericHTMLElement)
+
+  /**
+   * Remove an element from this form's list of elements
+   *
+   * @param aElement the element to remove
+   * @param aUpdateValidity If true, updates the form validity.
+   * @return NS_OK if the element was successfully removed.
+   */
+  nsresult RemoveElement(nsGenericHTMLFormElement* aElement,
+                         bool aUpdateValidity);
+
+  /**
+   * Remove an element from the lookup table maintained by the form.
+   * We can't fold this method into RemoveElement() because when
+   * RemoveElement() is called it doesn't know if the element is
+   * removed because the id attribute has changed, or because the
+   * name attribute has changed.
+   *
+   * @param aElement the element to remove
+   * @param aName the name or id of the element to remove
+   * @return NS_OK if the element was successfully removed.
+   */
+  nsresult RemoveElementFromTable(nsGenericHTMLFormElement* aElement,
+                                  const nsAString& aName);
+
+  /**
+   * Add an element to end of this form's list of elements
+   *
+   * @param aElement the element to add
+   * @param aUpdateValidity If true, the form validity will be updated.
+   * @param aNotify If true, send DocumentObserver notifications as needed.
+   * @return NS_OK if the element was successfully added
+   */
+  nsresult AddElement(nsGenericHTMLFormElement* aElement, bool aUpdateValidity,
+                      bool aNotify);
+
+  /**
+   * Add an element to the lookup table maintained by the form.
+   *
+   * We can't fold this method into AddElement() because when
+   * AddElement() is called, the form control has no
+   * attributes.  The name or id attributes of the form control
+   * are used as a key into the table.
+   */
+  nsresult AddElementToTable(nsGenericHTMLFormElement* aChild,
+                             const nsAString& aName);
+
+  /**
+   * Remove an image element from this form's list of image elements
+   *
+   * @param aElement the image element to remove
+   * @return NS_OK if the element was successfully removed.
+   */
+  nsresult RemoveImageElement(HTMLImageElement* aElement);
+
+  /**
+   * Remove an image element from the lookup table maintained by the form.
+   * We can't fold this method into RemoveImageElement() because when
+   * RemoveImageElement() is called it doesn't know if the element is
+   * removed because the id attribute has changed, or because the
+   * name attribute has changed.
+   *
+   * @param aElement the image element to remove
+   * @param aName the name or id of the element to remove
+   * @return NS_OK if the element was successfully removed.
+   */
+  nsresult RemoveImageElementFromTable(HTMLImageElement* aElement,
+                                       const nsAString& aName);
+  /**
+   * Add an image element to the end of this form's list of image elements
+   *
+   * @param aElement the element to add
+   * @return NS_OK if the element was successfully added
+   */
+  nsresult AddImageElement(HTMLImageElement* aElement);
+
+  /**
+   * Add an image element to the lookup table maintained by the form.
+   *
+   * We can't fold this method into AddImageElement() because when
+   * AddImageElement() is called, the image attributes can change.
+   * The name or id attributes of the image are used as a key into the table.
+   */
+  nsresult AddImageElementToTable(HTMLImageElement* aChild,
+                                  const nsAString& aName);
+
+  /**
+   * Returns true if implicit submission of this form is disabled. For more
+   * on implicit submission see:
+   *
+   * http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#implicit-submission
+   */
+  bool ImplicitSubmissionIsDisabled() const;
+
+  /**
+   * Check whether a given nsGenericHTMLFormElement is the last single line
+   * input control that is not disabled. aElement is expected to not be null.
+   */
+  bool IsLastActiveElement(const nsGenericHTMLFormElement* aElement) const;
+
+  /**
+   * Flag the form to know that a button or image triggered scripted form
+   * submission. In that case the form will defer the submission until the
+   * script handler returns and the return value is known.
+   */
+  void OnSubmitClickBegin(Element* aOriginatingElement);
+  void OnSubmitClickEnd();
+
+  /**
+   * This method will update the form validity.
+   *
+   * This method has to be called by form elements whenever their validity state
+   * or status regarding constraint validation changes.
+   *
+   * @note This method isn't used for CheckValidity().
+   * @note If an element becomes barred from constraint validation, it has to be
+   * considered as valid.
+   *
+   * @param aElementValidityState the new validity state of the element
+   */
+  void UpdateValidity(bool aElementValidityState);
+
+  /**
+   * This method check the form validity and make invalid form elements send
+   * invalid event if needed.
+   *
+   * @return Whether the form is valid.
+   *
+   * @note Do not call this method if novalidate/formnovalidate is used.
+   * @note This method might disappear with bug 592124, hopefuly.
+   * @see
+   * https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#interactively-validate-the-constraints
+   */
+  bool CheckValidFormSubmission();
+
+  /**
+   * Contruct the entry list to get their data pumped into the FormData and
+   * fire a `formdata` event with the entry list in formData attribute.
+   * <https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#constructing-form-data-set>
+   *
+   * @param aFormData the form data object
+   */
+  // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult ConstructEntryList(FormData*);
+
+  /**
+   * Implements form[name]. Returns form controls in this form with the correct
+   * value of the name attribute.
+   */
+  already_AddRefed<nsISupports> FindNamedItem(const nsAString& aName,
+                                              nsWrapperCache** aCache);
+
+  // WebIDL
+
+  void GetAcceptCharset(DOMString& aValue) {
+    GetHTMLAttr(nsGkAtoms::acceptcharset, aValue);
+  }
+
+  void SetAcceptCharset(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::acceptcharset, aValue, aRv);
+  }
+
+  void GetAction(nsString& aValue);
+  void SetAction(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::action, aValue, aRv);
+  }
+
+  void GetAutocomplete(nsAString& aValue);
+  void SetAutocomplete(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::autocomplete, aValue, aRv);
+  }
+
+  void GetEnctype(nsAString& aValue);
+  void SetEnctype(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::enctype, aValue, aRv);
+  }
+
+  void GetEncoding(nsAString& aValue) { GetEnctype(aValue); }
+  void SetEncoding(const nsAString& aValue, ErrorResult& aRv) {
+    SetEnctype(aValue, aRv);
+  }
+
+  void GetMethod(nsAString& aValue);
+  void SetMethod(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::method, aValue, aRv);
+  }
+
+  void GetName(DOMString& aValue) { GetHTMLAttr(nsGkAtoms::name, aValue); }
+
+  void SetName(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::name, aValue, aRv);
+  }
+
+  bool NoValidate() const { return GetBoolAttr(nsGkAtoms::novalidate); }
+
+  void SetNoValidate(bool aValue, ErrorResult& aRv) {
+    SetHTMLBoolAttr(nsGkAtoms::novalidate, aValue, aRv);
+  }
+
+  void GetTarget(DOMString& aValue) { GetHTMLAttr(nsGkAtoms::target, aValue); }
+
+  void SetTarget(const nsAString& aValue, ErrorResult& aRv) {
+    SetHTMLAttr(nsGkAtoms::target, aValue, aRv);
+  }
+
+  void GetRel(DOMString& aValue) { GetHTMLAttr(nsGkAtoms::rel, aValue); }
+  void SetRel(const nsAString& aRel, ErrorResult& aError) {
+    SetHTMLAttr(nsGkAtoms::rel, aRel, aError);
+  }
+  nsDOMTokenList* RelList();
+
+  // it's only out-of-line because the class definition is not available in the
+  // header
+  HTMLFormControlsCollection* Elements();
+
+  int32_t Length();
+
+  /**
+   * Check whether submission can proceed for this form then fire submit event.
+   * This basically implements steps 1-6 (more or less) of
+   * <https://html.spec.whatwg.org/multipage/forms.html#concept-form-submit>.
+   * @param aSubmitter If not null, is the "submitter" from that algorithm.
+   *                   Therefore it must be a valid submit control.
+   */
+  MOZ_CAN_RUN_SCRIPT void MaybeSubmit(Element* aSubmitter);
+  MOZ_CAN_RUN_SCRIPT void MaybeReset(Element* aSubmitter);
+  void Submit(ErrorResult& aRv);
+
+  /**
+   * Requests to submit the form. Unlike submit(), this method includes
+   * interactive constraint validation and firing a submit event,
+   * either of which can cancel submission.
+   *
+   * @param aSubmitter The submitter argument can be used to point to a specific
+   *                   submit button.
+   * @param aRv        An ErrorResult.
+   * @see
+   * https://html.spec.whatwg.org/multipage/forms.html#dom-form-requestsubmit
+   */
+  MOZ_CAN_RUN_SCRIPT void RequestSubmit(nsGenericHTMLElement* aSubmitter,
+                                        ErrorResult& aRv);
+
+  MOZ_CAN_RUN_SCRIPT void Reset();
+
+  bool CheckValidity() { return CheckFormValidity(nullptr); }
+
+  bool ReportValidity() { return CheckValidFormSubmission(); }
+
+  Element* IndexedGetter(uint32_t aIndex, bool& aFound);
+
+  already_AddRefed<nsISupports> NamedGetter(const nsAString& aName,
+                                            bool& aFound);
+
+  void GetSupportedNames(nsTArray<nsString>& aRetval);
+
+#ifdef DEBUG
+  static void AssertDocumentOrder(
+      const nsTArray<nsGenericHTMLFormElement*>& aControls, nsIContent* aForm);
+  static void AssertDocumentOrder(
+      const nsTArray<RefPtr<nsGenericHTMLFormElement>>& aControls,
+      nsIContent* aForm);
+#endif
+
+  JS::ExpandoAndGeneration mExpandoAndGeneration;
+
+ protected:
+  JSObject* WrapNode(JSContext*, JS::Handle<JSObject*> aGivenProto) override;
+
+  class RemoveElementRunnable;
+  friend class RemoveElementRunnable;
+
+  class RemoveElementRunnable : public Runnable {
+   public:
+    explicit RemoveElementRunnable(HTMLFormElement* aForm)
+        : Runnable("dom::HTMLFormElement::RemoveElementRunnable"),
+          mForm(aForm) {}
+
+    NS_IMETHOD Run() override {
+      mForm->HandleDefaultSubmitRemoval();
+      return NS_OK;
+    }
+
+   private:
+    RefPtr<HTMLFormElement> mForm;
+  };
+
+  nsresult DoReset();
+
+  // Async callback to handle removal of our default submit
+  void HandleDefaultSubmitRemoval();
+
+  //
+  // Submit Helpers
+  //
+  //
+  /**
+   * Attempt to submit (submission might be deferred)
+   *
+   * @param aPresContext the presentation context
+   * @param aEvent the DOM event that was passed to us for the submit
+   */
+  nsresult DoSubmit(Event* aEvent = nullptr);
+
+  /**
+   * Prepare the submission object (called by DoSubmit)
+   *
+   * @param aFormSubmission the submission object
+   * @param aEvent the DOM event that was passed to us for the submit
+   */
+  nsresult BuildSubmission(HTMLFormSubmission** aFormSubmission, Event* aEvent);
+  /**
+   * Perform the submission (called by DoSubmit and FlushPendingSubmission)
+   *
+   * @param aFormSubmission the submission object
+   */
+  nsresult SubmitSubmission(HTMLFormSubmission* aFormSubmission);
+
+  /**
+   * Submit a form[method=dialog]
+   * @param aFormSubmission the submission object
+   */
+  nsresult SubmitDialog(DialogFormSubmission* aFormSubmission);
+
+  /**
+   * Notify any submit observers of the submit.
+   *
+   * @param aActionURL the URL being submitted to
+   * @param aCancelSubmit out param where submit observers can specify that the
+   *        submit should be cancelled.
+   */
+  nsresult NotifySubmitObservers(nsIURI* aActionURL, bool* aCancelSubmit,
+                                 bool aEarlyNotify);
+
+  /**
+   * If this form submission is secure -> insecure, ask the user if they want
+   * to continue.
+   *
+   * @param aActionURL the URL being submitted to
+   * @param aCancelSubmit out param: will be true if the user wants to cancel
+   */
+  nsresult DoSecureToInsecureSubmitCheck(nsIURI* aActionURL,
+                                         bool* aCancelSubmit);
+
+  /**
+   * Find form controls in this form with the correct value in the name
+   * attribute.
+   */
+  already_AddRefed<nsISupports> DoResolveName(const nsAString& aName);
+
+  /**
+   * Check the form validity following this algorithm:
+   * https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#statically-validate-the-constraints
+   *
+   * @param aInvalidElements [out] parameter containing the list of unhandled
+   * invalid controls.
+   *
+   * @return Whether the form is currently valid.
+   */
+  bool CheckFormValidity(nsTArray<RefPtr<Element>>* aInvalidElements) const;
+
+  // Clear the mImageNameLookupTable and mImageElements.
+  void Clear();
+
+  // Insert a element into the past names map.
+  void AddToPastNamesMap(const nsAString& aName, nsISupports* aChild);
+
+  // Remove the given element from the past names map.  The element must be an
+  // nsGenericHTMLFormElement or HTMLImageElement.
+  void RemoveElementFromPastNamesMap(Element* aElement);
+
+  nsresult AddElementToTableInternal(
+      nsInterfaceHashtable<nsStringHashKey, nsISupports>& aTable,
+      nsIContent* aChild, const nsAString& aName);
+
+  nsresult RemoveElementFromTableInternal(
+      nsInterfaceHashtable<nsStringHashKey, nsISupports>& aTable,
+      nsIContent* aChild, const nsAString& aName);
+
+ public:
+  /**
+   * Flush a possible pending submission. If there was a scripted submission
+   * triggered by a button or image, the submission was defered. This method
+   * forces the pending submission to be submitted. (happens when the handler
+   * returns false or there is an action/target change in the script)
+   */
+  void FlushPendingSubmission();
+
+  /**
+   * Get the full URL to submit to.  Do not submit if the returned URL is null.
+   *
+   * @param aActionURL the full, unadulterated URL you'll be submitting to [OUT]
+   * @param aOriginatingElement the originating element of the form submission
+   * [IN]
+   */
+  nsresult GetActionURL(nsIURI** aActionURL, Element* aOriginatingElement);
+
+  // Returns a number for this form that is unique within its owner document.
+  // This is used by nsContentUtils::GenerateStateKey to identify form controls
+  // that are inserted into the document by the parser.
+  int32_t GetFormNumberForStateKey();
+
+  /**
+   * Called when we have been cloned and adopted, and the information of the
+   * node has been changed.
+   */
+  void NodeInfoChanged(Document* aOldDoc) override;
+
+ protected:
+  //
+  // Data members
+  //
+  /** The list of controls (form.elements as well as stuff not in elements) */
+  RefPtr<HTMLFormControlsCollection> mControls;
+
+  /** The pending submission object */
+  UniquePtr<HTMLFormSubmission> mPendingSubmission;
+
+  /** The target browsing context, if any. */
+  RefPtr<BrowsingContext> mTargetContext;
+  /** The load identifier for the pending request created for a
+   * submit, used to be able to block double submits. */
+  Maybe<uint64_t> mCurrentLoadId;
+
+  /** The default submit element -- WEAK */
+  nsGenericHTMLFormElement* mDefaultSubmitElement;
+
+  /** The first submit element in mElements -- WEAK */
+  nsGenericHTMLFormElement* mFirstSubmitInElements;
+
+  /** The first submit element in mNotInElements -- WEAK */
+  nsGenericHTMLFormElement* mFirstSubmitNotInElements;
+
+  // This array holds on to all HTMLImageElement(s).
+  // This is needed to properly clean up the bi-directional references
+  // (both weak and strong) between the form and its HTMLImageElements.
+
+  // Holds WEAK references
+  TreeOrderedArray<HTMLImageElement*> mImageElements;
+
+  // A map from an ID or NAME attribute to the HTMLImageElement(s), this
+  // hash holds strong references either to the named HTMLImageElement, or
+  // to a list of named HTMLImageElement(s), in the case where this hash
+  // holds on to a list of named HTMLImageElement(s) the list has weak
+  // references to the HTMLImageElement.
+
+  nsInterfaceHashtable<nsStringHashKey, nsISupports> mImageNameLookupTable;
+
+  // A map from names to elements that were gotten by those names from this
+  // form in that past.  See "past names map" in the HTML5 specification.
+
+  nsInterfaceHashtable<nsStringHashKey, nsISupports> mPastNameLookupTable;
+
+  /** Keep track of what the popup state was when the submit was initiated */
+  PopupBlocker::PopupControlState mSubmitPopupState;
+
+  RefPtr<nsDOMTokenList> mRelList;
+
+  /**
+   * Number of invalid and candidate for constraint validation elements in the
+   * form the last time UpdateValidity has been called.
+   */
+  int32_t mInvalidElementsCount;
+
+  // See GetFormNumberForStateKey.
+  int32_t mFormNumber;
+
+  /** Whether we are currently processing a submit event or not */
+  bool mGeneratingSubmit;
+  /** Whether we are currently processing a reset event or not */
+  bool mGeneratingReset;
+  /** Whether the submission is to be deferred in case a script triggers it */
+  bool mDeferSubmission;
+  /** Whether we notified NS_FORMSUBMIT_SUBJECT listeners already */
+  bool mNotifiedObservers;
+  /** If we notified the listeners early, what was the result? */
+  bool mNotifiedObserversResult;
+  /**
+   * Whether the submission of this form has been ever prevented because of
+   * being invalid.
+   */
+  bool mEverTriedInvalidSubmit;
+  /** Whether we are constructing entry list */
+  bool mIsConstructingEntryList;
+  /** Whether we are firing submission event */
+  bool mIsFiringSubmissionEvents;
+
+ private:
+  bool IsSubmitting() const;
+
+  void SetDefaultSubmitElement(nsGenericHTMLFormElement*);
+
+  NotNull<const Encoding*> GetSubmitEncoding();
+
+  /**
+   * Fire an event when the form is removed from the DOM tree. This is now only
+   * used by the password manager and formautofill.
+   */
+  void MaybeFireFormRemoved();
+
+  MOZ_CAN_RUN_SCRIPT
+  void ReportInvalidUnfocusableElements();
+
+  ~HTMLFormElement();
+};
+
+}  // namespace dom
+
+}  // namespace mozilla
+
+#endif  // mozilla_dom_HTMLFormElement_h