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chromium/third_party/blink/web_tests/fast/dom/attribute-downcast-right.html 

<SCRIPT>
if (window.testRunner)
    testRunner.dumpAsText();

var oElement = document.createElement("s")
var oElementNS = document.createElementNS("http://example.com/", "example");
oElementNS.setAttributeNS("http://example.com/", "example", "");
var oAttributeNS = oElementNS.getAttributeNodeNS("http://example.com/", "example");
var oAttributeNSClone = oAttributeNS.cloneNode();
oElement.setAttributeNode(oAttributeNSClone);
</SCRIPT>
<BODY>
This tests that an Attribute object is not downcasted to a MappedAttribute.
See http://bugs.webkit.org/show_bug.cgi?id=21032 .
</BODY>