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diff --git a/parser/html/jArray.h b/parser/html/jArray.h
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+/*
+ * Copyright (c) 2008-2015 Mozilla Foundation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef jArray_h
+#define jArray_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/BinarySearch.h"
+#include "nsDebug.h"
+
+template <class T, class L>
+struct staticJArray {
+  const T* arr;
+  const L length;
+  operator T*() { return arr; }
+  T& operator[](L const index) {
+    MOZ_ASSERT(index >= 0, "Array access with negative index.");
+    MOZ_ASSERT(index < length, "Array index out of bounds.");
+    return ((T*)arr)[index];
+  }
+  L binarySearch(T const elem) {
+    size_t idx;
+    bool found = mozilla::BinarySearch(arr, 0, length, elem, &idx);
+    return found ? idx : -1;
+  }
+};
+
+template <class T, class L>
+class autoJArray;
+
+template <class T, class L>
+class jArray {
+  friend class autoJArray<T, L>;
+
+ private:
+  T* arr;
+
+ public:
+  L length;
+  static jArray<T, L> newJArray(L const len) {
+    MOZ_ASSERT(len >= 0, "Negative length.");
+    jArray<T, L> newArray = {new T[size_t(len)], len};
+    return newArray;
+  }
+  static jArray<T, L> newFallibleJArray(L const len) {
+    MOZ_ASSERT(len >= 0, "Negative length.");
+    T* a = new (mozilla::fallible) T[size_t(len)];
+    jArray<T, L> newArray = {a, a ? len : 0};
+    return newArray;
+  }
+  operator T*() { return arr; }
+  T& operator[](L const index) {
+    MOZ_ASSERT(index >= 0, "Array access with negative index.");
+    MOZ_ASSERT(index < length, "Array index out of bounds.");
+    return arr[index];
+  }
+  void operator=(staticJArray<T, L>& other) {
+    arr = (T*)other.arr;
+    length = other.length;
+  }
+  MOZ_IMPLICIT jArray(decltype(nullptr)) : arr(nullptr), length(0) {}
+  jArray() : arr(nullptr), length(0) {}
+
+ private:
+  jArray(T* aArr, L aLength) : arr(aArr), length(aLength) {}
+};
+
+template <class T, class L>
+class autoJArray {
+ private:
+  T* arr;
+
+ public:
+  L length;
+  autoJArray() : arr(0), length(0) {}
+  MOZ_IMPLICIT autoJArray(const jArray<T, L>& other)
+      : arr(other.arr), length(other.length) {}
+  ~autoJArray() { delete[] arr; }
+  operator T*() { return arr; }
+  T& operator[](L const index) {
+    MOZ_ASSERT(index >= 0, "Array access with negative index.");
+    MOZ_ASSERT(index < length, "Array index out of bounds.");
+    return arr[index];
+  }
+  operator jArray<T, L>() {
+    // WARNING! This makes it possible to goof with buffer ownership!
+    // This is needed for the getStack and getListOfActiveFormattingElements
+    // methods to work sensibly.
+    jArray<T, L> newArray = {arr, length};
+    return newArray;
+  }
+  void operator=(const jArray<T, L>& other) {
+    delete[] arr;
+    arr = other.arr;
+    length = other.length;
+  }
+  void operator=(decltype(nullptr)) {
+    // Make assigning null to an array in Java delete the buffer in C++
+    delete[] arr;
+    arr = nullptr;
+    length = 0;
+  }
+};
+
+#endif  // jArray_h