mshtml: Added support for IHTMLDOMAttribute2::get_value on detached attributes.

dlls/mshtml/htmlattr.c

@@ -310,12 +310,11 @@ static HRESULT WINAPI HTMLDOMAttribute2_get_value(IHTMLDOMAttribute2 *iface, BST
 
     TRACE("(%p)->(%p)\n", This, p);
 
-    if(!This->elem) {
-        FIXME("NULL This->elem\n");
-        return E_UNEXPECTED;
-    }
-
-    hres = get_elem_attr_value_by_dispid(This->elem, This->dispid, &val);
+    V_VT(&val) = VT_EMPTY;
+    if(This->elem)
+        hres = get_elem_attr_value_by_dispid(This->elem, This->dispid, &val);
+    else
+        hres = VariantCopy(&val, &This->value);
     if(SUCCEEDED(hres))
         hres = attr_value_to_string(&val);
     if(FAILED(hres))

dlls/mshtml/tests/dom.c

@@ -8610,11 +8610,18 @@ static void test_attr(IHTMLDocument2 *doc, IHTMLElement *elem)
 
     get_attr_node_value(attr, &v, VT_I4);
     ok(V_I4(&v) == 1, "nodeValue = %d\n", V_I4(&v));
+    test_attr_value(attr, "1");
 
     V_VT(&v) = VT_EMPTY;
     put_attr_node_value(attr, v);
     get_attr_node_value(attr, &v, VT_EMPTY);
 
+    V_VT(&v) = VT_BSTR;
+    V_BSTR(&v) = a2bstr("testing");
+    put_attr_node_value(attr, v);
+    SysFreeString(V_BSTR(&v));
+    test_attr_value(attr, "testing");
+
     IHTMLDOMAttribute_Release(attr);
 }