1 files changed, 35 insertions, 0 deletions
diff --git a/addons/website/static/lib/MutationObservers/test/sidetable.js b/addons/website/static/lib/MutationObservers/test/sidetable.js
new file mode 100644
index 00000000000..cae31e6c012
--- /dev/null
+++ b/addons/website/static/lib/MutationObservers/test/sidetable.js
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012 The Polymer Authors. All rights reserved.
+ * Use of this source code is goverened by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+// SideTable is a weak map where possible. If WeakMap is not available the
+// association is stored as an expando property.
+var SideTable;
+// TODO(arv): WeakMap does not allow for Node etc to be keys in Firefox
+if (typeof WeakMap !== 'undefined' && navigator.userAgent.indexOf('Firefox/') < 0) {
+  SideTable = WeakMap;
+} else {
+  (function() {
+    var defineProperty = Object.defineProperty;
+    var hasOwnProperty = Object.hasOwnProperty;
+    var counter = new Date().getTime() % 1e9;
+
+    SideTable = function() {
+      this.name = '__st' + (Math.random() * 1e9 >>> 0) + (counter++ + '__');
+    };
+
+    SideTable.prototype = {
+      set: function(key, value) {
+        defineProperty(key, this.name, {value: value, writable: true});
+      },
+      get: function(key) {
+        return hasOwnProperty.call(key, this.name) ? key[this.name] : undefined;
+      },
+      delete: function(key) {
+        this.set(key, undefined);
+      }
+    }
+  })();
+}