Events triggered on top level elements (such as window or document)
lead to a HierarchyRequestError due to a fix in IE browsers
where dispatchEvent does not fire if an element is not in the DOM.
The current test is simply to check for the existence of parentNode
However, this means top level elements get added to itself, causing
the error.
The proposed fix simply tests for top level elements in the test.
also added test for uniqueid. only test that two calls to uniqueid return unique enties. had to modify the output slightly and added a counter to the system otherwise two back to back calls would return the same value.
