Page Load Countdown

This feature is not implemented but it’s not a hard task. The question is: what this feature is intended for? Should it fire some action on countdown zero?
Users can easily find workarounds – reloading the page will reset the countdown. Of course, if there is a form on page all data will be lost on reload, but if you plan to automatically submit this form when time is over (e.g. for a quiz) some more programming will be required.