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diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox_011.htm b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox_011.htm
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+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox_011.htm
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>HTML5 Sandbox: iframe sandbox attribute value support DOMTokenList interface.</title>
+    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
+    <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
+    <link rel="help" href="http://dev.w3.org/html5/spec/Overview.html#the-iframe-element" />
+    <meta name="assert" content="iframe sandbox attribute value support DOMTokenList interface." />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id=log></div>
+    <iframe id="iframe1" src="about:blank" sandbox="allow-scripts allow-same-origin allow-forms" style="display : none"></iframe>
+    <script type="text/javascript">
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        assert_equals(iframeEle.sandbox.length, 3)
+    }, "DOMTokenList length")
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        assert_equals(iframeEle.sandbox.item(1),  "allow-same-origin")
+    }, "DOMTokenList item(index)")
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        assert_true(iframeEle.sandbox.contains("allow-forms"))
+    }, "DOMTokenList contains(DomString)")
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        iframeEle.sandbox.add("ALLOW-SANDBOX");
+        assert_true(iframeEle.sandbox.contains("ALLOW-SANDBOX"))
+    }, "DOMTokenList add(DomString)")
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        iframeEle.sandbox.remove("ALLOW-SANDBOX");
+        assert_false(iframeEle.sandbox.contains("ALLOW-SANDBOX"))
+    }, "DOMTokenList remove(DomString)")
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        iframeEle.sandbox.remove("ALLOW-SANDBOX");
+        assert_true(
+            iframeEle.sandbox.toggle("allow-top-navigation") && iframeEle.sandbox.contains("allow-top-navigation") &&
+            !iframeEle.sandbox.toggle("allow-top-navigation") && !iframeEle.sandbox.contains("allow-top-navigation")
+        )
+    }, "DOMTokenList toggle(DomString) - Returns true if token is now present (it was added); returns false if it is not (it was removed).")
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        assert_equals(iframeEle.sandbox.value, iframeEle.sandbox.toString())
+    }, "DOMTokenList sandbox.toString()")
+
+    test(function() {
+        var iframeEle = document.getElementById("iframe1");
+        iframeEle.sandbox.remove("ALLOW-SANDBOX");
+        assert_true(iframeEle.sandbox.contains("allow-scripts") != iframeEle.sandbox.contains("Allow-SCRIPTS"))
+    }, "DOMTokenList case sensitivity")
+    </script>
+</body>
+</html>