This part of m.grl runs to check for features and/or browser behavior that is absolutely required for m.grl to function properly. If something is missing, then a page should be displayed to the end user informing them that their browser of choice lacks critical functionality, and that they should consider trying firefox or chrome.
please.qa_failed ()
This is called automatically when the browser is missing some critical functionality that cannot be polyfilled. It should display some kind of message to the user. You can override this method to provide your own behavior for this.