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diff --git a/dom/html/nsIConstraintValidation.h b/dom/html/nsIConstraintValidation.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 nsIConstraintValidition_h___
+#define nsIConstraintValidition_h___
+
+#include "nsISupports.h"
+
+class nsIContent;
+
+namespace mozilla::dom {
+class ValidityState;
+} // namespace mozilla::dom
+
+#define NS_ICONSTRAINTVALIDATION_IID \
+ { \
+ 0x983829da, 0x1aaf, 0x449c, { \
+ 0xa3, 0x06, 0x85, 0xd4, 0xf0, 0x31, 0x1c, 0xf6 \
+ } \
+ }
+
+/**
+ * This interface is for form elements implementing the validity constraint API.
+ * See: http://dev.w3.org/html5/spec/forms.html#the-constraint-validation-api
+ *
+ * This interface has to be implemented by all elements implementing the API
+ * and only them.
+ */
+class nsIConstraintValidation : public nsISupports {
+ public:
+ NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICONSTRAINTVALIDATION_IID);
+
+ friend class mozilla::dom::ValidityState;
+
+ static const uint16_t sContentSpecifiedMaxLengthMessage;
+
+ virtual ~nsIConstraintValidation();
+
+ bool IsValid() const { return mValidityBitField == 0; }
+
+ bool IsCandidateForConstraintValidation() const {
+ return !mBarredFromConstraintValidation;
+ }
+
+ enum ValidityStateType {
+ VALIDITY_STATE_VALUE_MISSING = 0x1 << 0,
+ VALIDITY_STATE_TYPE_MISMATCH = 0x1 << 1,
+ VALIDITY_STATE_PATTERN_MISMATCH = 0x1 << 2,
+ VALIDITY_STATE_TOO_LONG = 0x1 << 3,
+ VALIDITY_STATE_TOO_SHORT = 0x1 << 4,
+ VALIDITY_STATE_RANGE_UNDERFLOW = 0x1 << 5,
+ VALIDITY_STATE_RANGE_OVERFLOW = 0x1 << 6,
+ VALIDITY_STATE_STEP_MISMATCH = 0x1 << 7,
+ VALIDITY_STATE_BAD_INPUT = 0x1 << 8,
+ VALIDITY_STATE_CUSTOM_ERROR = 0x1 << 9,
+ };
+
+ void SetValidityState(ValidityStateType aState, bool aValue);
+
+ /**
+ * Check the validity of this object. If it is not valid, file a "invalid"
+ * event on the aEventTarget.
+ *
+ * @param aEventTarget The target of the event.
+ * @param aDefaultAction Set to true if default action should be taken,
+ * see EventTarget::DispatchEvent.
+ * @return whether it's valid.
+ */
+ bool CheckValidity(nsIContent& aEventTarget,
+ bool* aEventDefaultAction = nullptr) const;
+
+ // Web IDL binding methods
+ bool WillValidate() const { return IsCandidateForConstraintValidation(); }
+ mozilla::dom::ValidityState* Validity();
+ bool ReportValidity();
+
+ protected:
+ // You can't instantiate an object from that class.
+ nsIConstraintValidation();
+
+ bool GetValidityState(ValidityStateType aState) const {
+ return mValidityBitField & aState;
+ }
+
+ void SetBarredFromConstraintValidation(bool aBarred);
+
+ /**
+ * A pointer to the ValidityState object.
+ */
+ RefPtr<mozilla::dom::ValidityState> mValidity;
+
+ private:
+ /**
+ * A bitfield representing the current validity state of the element.
+ * Each bit represent an error. All bits to zero means the element is valid.
+ */
+ int16_t mValidityBitField;
+
+ /**
+ * Keeps track whether the element is barred from constraint validation.
+ */
+ bool mBarredFromConstraintValidation;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIConstraintValidation,
+ NS_ICONSTRAINTVALIDATION_IID)
+
+#endif // nsIConstraintValidation_h___