LayoutTests/fast/dom/Node/nullable-parameters.html

<script src="../../../resources/js-test-pre.js"></script>
<script>
description("Tests the behavior of a few Node API parameters that should be nullable");

var element = document.createElement("test");
element.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:c", "undefined");
shouldBeEqualToString("element.lookupPrefix('undefined')", "c");
shouldBeNull("element.lookupPrefix(null)");
shouldBeNull("element.lookupPrefix(undefined)");

debug("");
element = document.createElement("test");
element.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:undefined", "test");
shouldBeEqualToString("element.lookupNamespaceURI('undefined')", "test");
shouldBeEqualToString("element.lookupNamespaceURI(null)", "http://www.w3.org/1999/xhtml");
shouldBeEqualToString("element.lookupNamespaceURI(undefined)", "http://www.w3.org/1999/xhtml");

debug("");
var element = document.createElementNS("undefined", "test");
shouldBeTrue("element.isDefaultNamespace('undefined')");
shouldBeFalse("element.isDefaultNamespace(undefined)");

element = document.createElementNS("null", "test");
shouldBeTrue("element.isDefaultNamespace('null')");
shouldBeFalse("element.isDefaultNamespace(null)");

</script>
<script src="../../../resources/js-test-post.js"></script>