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diff --git a/testing/web-platform/tests/webstorage/storage_setitem.html b/testing/web-platform/tests/webstorage/storage_setitem.html
new file mode 100644
index 000000000..fa38284fd
--- /dev/null
+++ b/testing/web-platform/tests/webstorage/storage_setitem.html
@@ -0,0 +1,223 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>WebStorage Test: Storage - setItem(key, value)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+["localStorage", "sessionStorage"].forEach(function(name) {
+    var test_error = { name: "test" };
+    var interesting_strs = ["\uD7FF", "\uD800", "\uDBFF", "\uDC00",
+                            "\uDFFF", "\uE000", "\uFFFD", "\uFFFE", "\uFFFF",
+                            "\uD83C\uDF4D", "\uD83Ca", "a\uDF4D",
+                            "\uDBFF\uDFFF"];
+
+    for (var i = 0; i <= 0xFF; i++) {
+        interesting_strs.push(String.fromCharCode(i));
+    }
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage.setItem("name", "user1");
+        assert_equals(storage.length, 1, "localStorage.setItem")
+    }, name + ".setItem()");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage["name"] = "user1";
+        assert_true("name" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("name"), "user1");
+        assert_equals(storage["name"], "user1");
+    }, name + "[]");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage["name"] = "user1";
+        storage["name"] = "user2";
+        assert_true("name" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("name"), "user2");
+        assert_equals(storage["name"], "user2");
+    }, name + "[] update");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage.setItem("age", null);
+        assert_true("age" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("age"), "null");
+        assert_equals(storage["age"], "null");
+    }, name + ".setItem(_, null)");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage["age"] = null;
+        assert_true("age" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("age"), "null");
+        assert_equals(storage["age"], "null");
+    }, name + "[] = null");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage.setItem("age", undefined);
+        assert_true("age" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("age"), "undefined");
+        assert_equals(storage["age"], "undefined");
+    }, name + ".setItem(_, undefined)");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage["age"] = undefined;
+        assert_true("age" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("age"), "undefined");
+        assert_equals(storage["age"], "undefined");
+    }, name + "[] = undefined");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage.setItem("age", "10");
+        assert_throws(test_error, function() {
+            storage.setItem("age",
+                { toString: function() { throw test_error; } });
+        });
+        assert_true("age" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("age"), "10");
+        assert_equals(storage["age"], "10");
+    }, name + ".setItem({ throws })");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage.setItem("age", "10");
+        assert_throws(test_error, function() {
+            storage["age"] =
+                { toString: function() { throw test_error; } };
+        });
+        assert_true("age" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("age"), "10");
+        assert_equals(storage["age"], "10");
+    }, name + "[] = { throws }");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage.setItem(undefined, "test");
+        assert_true("undefined" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("undefined"), "test");
+        assert_equals(storage["undefined"], "test");
+    }, name + ".setItem(undefined, _)");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage[undefined] = "test2";
+        assert_true("undefined" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("undefined"), "test2");
+        assert_equals(storage["undefined"], "test2");
+    }, name + "[undefined]");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage.setItem(null, "test");
+        assert_true("null" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("null"), "test");
+        assert_equals(storage["null"], "test");
+    }, name + ".setItem(null, _)");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage[null] = "test2";
+        assert_true("null" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("null"), "test2");
+        assert_equals(storage["null"], "test2");
+    }, name + "[null]");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage["foo\0bar"] = "user1";
+        assert_true("foo\0bar" in storage);
+        assert_false("foo\0" in storage);
+        assert_false("foo\0baz" in storage);
+        assert_false("foo" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("foo\0bar"), "user1");
+        assert_equals(storage.getItem("foo\0"), null);
+        assert_equals(storage.getItem("foo\0baz"), null);
+        assert_equals(storage.getItem("foo"), null);
+        assert_equals(storage["foo\0bar"], "user1");
+        assert_equals(storage["foo\0"], undefined);
+        assert_equals(storage["foo\0baz"], undefined);
+        assert_equals(storage["foo"], undefined);
+    }, name + " key containing null");
+
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+
+        storage["name"] = "foo\0bar";
+        assert_true("name" in storage);
+        assert_equals(storage.length, 1, "storage.length")
+        assert_equals(storage.getItem("name"), "foo\0bar");
+        assert_equals(storage["name"], "foo\0bar");
+    }, name + " value containing null");
+
+    for (i = 0; i < interesting_strs.length; i++) {
+        var str = interesting_strs[i];
+        test(function() {
+            var storage = window[name];
+            storage.clear();
+
+            storage[str] = "user1";
+            assert_true(str in storage);
+            assert_equals(storage.length, 1, "storage.length")
+            assert_equals(storage.getItem(str), "user1");
+            assert_equals(storage[str], "user1");
+        }, name + "[" + format_value(str) + "]");
+
+        test(function() {
+            var storage = window[name];
+            storage.clear();
+
+            storage["name"] = str;
+            assert_equals(storage.length, 1, "storage.length")
+            assert_equals(storage.getItem("name"), str);
+            assert_equals(storage["name"], str);
+        }, name + "[] = " + format_value(str));
+    }
+});
+</script>