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diff --git a/dom/base/nsSandboxFlags.h b/dom/base/nsSandboxFlags.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/. */
+
+/*
+ * Constant flags that describe how a document is sandboxed according to the
+ * HTML5 spec.
+ */
+
+#ifndef nsSandboxFlags_h___
+#define nsSandboxFlags_h___
+
+/**
+ * This constant denotes the lack of a sandbox attribute/directive.
+ */
+const unsigned long SANDBOXED_NONE = 0x0;
+
+/**
+ * This flag prevents content from navigating browsing contexts other than
+ * itself, browsing contexts nested inside it, the top-level browsing context
+ * and browsing contexts that it has opened.
+ * As it is always on for sandboxed browsing contexts, it is used implicitly
+ * within the code by checking that the overall flags are non-zero.
+ * It is only uesd directly when the sandbox flags are initially set up.
+ */
+const unsigned long SANDBOXED_NAVIGATION = 0x1;
+
+/**
+ * This flag prevents content from creating new auxiliary browsing contexts,
+ * e.g. using the target attribute, or the window.open() method.
+ */
+const unsigned long SANDBOXED_AUXILIARY_NAVIGATION = 0x2;
+
+/**
+ * This flag prevents content from navigating their top-level browsing
+ * context.
+ */
+const unsigned long SANDBOXED_TOPLEVEL_NAVIGATION = 0x4;
+
+/**
+ * This flag prevents content from instantiating plugins, whether using the
+ * embed element, the object element, or through navigation of a nested browsing
+ * context, unless those plugins can be secured.
+ */
+const unsigned long SANDBOXED_PLUGINS = 0x8;
+
+/**
+ * This flag forces content into a unique origin, thus preventing it from
+ * accessing other content from the same origin.
+ * This flag also prevents script from reading from or writing to the
+ * document.cookie IDL attribute, and blocks access to localStorage.
+ */
+const unsigned long SANDBOXED_ORIGIN = 0x10;
+
+/**
+ * This flag blocks form submission.
+ */
+const unsigned long SANDBOXED_FORMS = 0x20;
+
+/**
+ * This flag blocks the document from acquiring pointerlock.
+ */
+const unsigned long SANDBOXED_POINTER_LOCK = 0x40;
+
+/**
+ * This flag blocks script execution.
+ */
+const unsigned long SANDBOXED_SCRIPTS = 0x80;
+
+/**
+ * This flag blocks features that trigger automatically, such as
+ * automatically playing a video or automatically focusing a form control.
+ */
+const unsigned long SANDBOXED_AUTOMATIC_FEATURES = 0x100;
+
+/**
+ * This flag prevents URL schemes that use storage areas from being able to
+ * access the origin's data.
+ */
+// We don't have an explicit representation of this one, apparently?
+// const unsigned long SANDBOXED_STORAGE_AREA_URLS = 0x200;
+
+/**
+ * This flag blocks the document from changing document.domain.
+ */
+const unsigned long SANDBOXED_DOMAIN = 0x400;
+
+/**
+ * This flag prevents content from using window.alert(), window.confirm(),
+ * window.print(), window.prompt() and the beforeunload event from putting up
+ * dialogs.
+ */
+const unsigned long SANDBOXED_MODALS = 0x800;
+
+/**
+ * This flag prevents content from escaping the sandbox by ensuring that any
+ * auxiliary browsing context it creates inherits the content's active
+ * sandboxing flag set.
+ */
+const unsigned long SANDBOX_PROPAGATES_TO_AUXILIARY_BROWSING_CONTEXTS = 0x1000;
+
+/**
+ * This flag prevents locking screen orientation.
+ */
+const unsigned long SANDBOXED_ORIENTATION_LOCK = 0x2000;
+
+/**
+ * This flag disables the Presentation API.
+ */
+const unsigned long SANDBOXED_PRESENTATION = 0x4000;
+
+/**
+ * This flag disables access to the first-party storage area by user activation.
+ */
+const unsigned long SANDBOXED_STORAGE_ACCESS = 0x8000;
+
+/**
+ * This flag prevents content from navigating their top-level browsing
+ * context only when the user hasn't interacted with the browser.
+ */
+const unsigned long SANDBOXED_TOPLEVEL_NAVIGATION_USER_ACTIVATION = 0x20000;
+
+/**
+ * This flag disables content from initiating or instantiating downloads,
+ * whether through downloading hyperlinks or through navigation that gets
+ * handled as a download.
+ */
+const unsigned long SANDBOXED_ALLOW_DOWNLOADS = 0x10000;
+
+const unsigned long SANDBOX_ALL_FLAGS = 0xFFFFF;
+#endif