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diff --git a/dom/html/HTMLMeterElement.h b/dom/html/HTMLMeterElement.h
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+++ b/dom/html/HTMLMeterElement.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_HTMLMeterElement_h
+#define mozilla_dom_HTMLMeterElement_h
+
+#include "mozilla/Attributes.h"
+#include "nsGenericHTMLElement.h"
+#include "nsAttrValue.h"
+#include "nsAttrValueInlines.h"
+#include "nsAlgorithm.h"
+#include <algorithm>
+
+namespace mozilla::dom {
+
+class HTMLMeterElement final : public nsGenericHTMLElement {
+ public:
+  explicit HTMLMeterElement(
+      already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+
+  virtual ElementState IntrinsicState() const override;
+
+  nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+
+  virtual bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
+                              const nsAString& aValue,
+                              nsIPrincipal* aMaybeScriptedPrincipal,
+                              nsAttrValue& aResult) override;
+
+  // WebIDL
+
+  /* @return the value */
+  double Value() const;
+  /* Returns the percentage that this element should be filed based on the
+   * min/max/value */
+  double Position() const;
+  void SetValue(double aValue, ErrorResult& aRv) {
+    SetDoubleAttr(nsGkAtoms::value, aValue, aRv);
+  }
+
+  /* @return the minimum value */
+  double Min() const;
+  void SetMin(double aValue, ErrorResult& aRv) {
+    SetDoubleAttr(nsGkAtoms::min, aValue, aRv);
+  }
+
+  /* @return the maximum value */
+  double Max() const;
+  void SetMax(double aValue, ErrorResult& aRv) {
+    SetDoubleAttr(nsGkAtoms::max, aValue, aRv);
+  }
+
+  /* @return the low value */
+  double Low() const;
+  void SetLow(double aValue, ErrorResult& aRv) {
+    SetDoubleAttr(nsGkAtoms::low, aValue, aRv);
+  }
+
+  /* @return the high value */
+  double High() const;
+  void SetHigh(double aValue, ErrorResult& aRv) {
+    SetDoubleAttr(nsGkAtoms::high, aValue, aRv);
+  }
+
+  /* @return the optimum value */
+  double Optimum() const;
+  void SetOptimum(double aValue, ErrorResult& aRv) {
+    SetDoubleAttr(nsGkAtoms::optimum, aValue, aRv);
+  }
+
+  NS_IMPL_FROMNODE_HTML_WITH_TAG(HTMLMeterElement, meter);
+
+ protected:
+  virtual ~HTMLMeterElement();
+
+  virtual JSObject* WrapNode(JSContext* aCx,
+                             JS::Handle<JSObject*> aGivenProto) override;
+
+ private:
+  static const double kDefaultValue;
+  static const double kDefaultMin;
+  static const double kDefaultMax;
+
+  /**
+   * Returns the optimum state of the element.
+   * ElementState::OPTIMUM if the actual value is in the optimum region.
+   * ElementState::SUB_OPTIMUM if the actual value is in the sub-optimal
+   *                            region.
+   * ElementState::SUB_SUB_OPTIMUM if the actual value is in the
+   *                                sub-sub-optimal region.
+   *
+   * @return the optimum state of the element.
+   */
+  ElementState GetOptimumState() const;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_HTMLMeterElement_h