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diff --git a/testing/web-platform/tests/webstorage/storage_in.html b/testing/web-platform/tests/webstorage/storage_in.html
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index 000000000..8b336047c
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+++ b/testing/web-platform/tests/webstorage/storage_in.html
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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>WebStorage Test: Storage - in operator</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+["localStorage", "sessionStorage"].forEach(function(name) {
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        assert_false("name" in storage);
+        storage["name"] = "user1";
+        assert_true("name" in storage);
+    }, "The in operator in " + name + ": property access");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        assert_false("name" in storage);
+        storage.setItem("name", "user1");
+        assert_true("name" in storage);
+        assert_equals(storage.name, "user1");
+        storage.removeItem("name");
+        assert_false("name" in storage);
+    }, "The in operator in " + name + ": method access");
+});
+</script>