diff -r 000000000000 -r 6474c204b198 layout/style/TopLevelImageDocument.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/TopLevelImageDocument.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/*
+  This CSS stylesheet defines the rules to be applied to ImageDocuments that
+  are top level (e.g. not iframes).
+*/
+
+@media not print {
+  body {
+    margin: 0;
+  }
+
+  img {
+    text-align: center;
+    position: absolute;
+    margin: auto;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+  }
+
+  .completeRotation {
+    transition: transform 0.3s ease 0s;
+  }
+}
+
+img {
+  image-orientation: from-image;
+}