mshtml: Add IHTMLDOMNode3::get_namespaceURI implementation.

dlls/mshtml/htmlnode.c

@@ -1227,8 +1227,14 @@ static HRESULT WINAPI HTMLDOMNode3_get_localName(IHTMLDOMNode3 *iface, VARIANT *
 static HRESULT WINAPI HTMLDOMNode3_get_namespaceURI(IHTMLDOMNode3 *iface, VARIANT *p)
 {
     HTMLDOMNode *This = impl_from_IHTMLDOMNode3(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+    nsAString nsstr;
+    nsresult nsres;
+
+    TRACE("(%p)->(%p)\n", This, p);
+
+    nsAString_InitDepend(&nsstr, NULL);
+    nsres = nsIDOMNode_GetNamespaceURI(This->nsnode, &nsstr);
+    return return_nsstr_variant(nsres, &nsstr, p);
 }
 
 static HRESULT WINAPI HTMLDOMNode3_put_textContent(IHTMLDOMNode3 *iface, VARIANT v)

dlls/mshtml/tests/elements.js

@@ -174,15 +174,19 @@ function test_createElementNS() {
 
     elem = document.createElementNS(null, "test");
     ok(elem.tagName === "test", "elem.tagName = " + elem.tagName);
+    ok(elem.namespaceURI === null, "elem.namespaceURI = " + elem.namespaceURI);
 
     elem = document.createElementNS(svg_ns, "test");
     ok(elem.tagName === "test", "elem.tagName = " + elem.tagName);
+    ok(elem.namespaceURI === svg_ns, "elem.namespaceURI = " + elem.namespaceURI);
 
     elem = document.createElementNS(svg_ns, "svg");
     ok(elem.tagName === "svg", "elem.tagName = " + elem.tagName);
+    ok(elem.namespaceURI === svg_ns, "elem.namespaceURI = " + elem.namespaceURI);
 
     elem = document.createElementNS("test", "svg");
     ok(elem.tagName === "svg", "elem.tagName = " + elem.tagName);
+    ok(elem.namespaceURI === "test", "elem.namespaceURI = " + elem.namespaceURI);
 
     next_test();
 }