diff --git a/tests/content/test_storage.html b/tests/content/test_storage.html
new file mode 100644
index 00000000000..81b1abccdd4
--- /dev/null
+++ b/tests/content/test_storage.html
@@ -0,0 +1,13 @@
+<html>
+<head>
+  <title></title>
+</head>
+<body>
+  <script>
+    // Delete keys that don't exist in either localStorage
+    // or sessionStorage.
+    delete localStorage.a;
+    delete sessionStorage.a;
+  </script>
+</body>
+</html>
