As a follow up to bug 13541, we should test and asses the behavior of setting DOMString attributes to JS undefined. We should test using both dot notation and get/setAttribute.
Created attachment 14585 [details]
This patch refactors the tests for setting js null to DOMString DOM attributes and uses the new modularity to add similar tests for js undefined. I still need to make sure the results are correct and update the expected results to show that.
We have coverage now.