It would have to appear outside the view-port. alert('blah') works like this in most browsers. In Chrome, it's subtle (it covers up your bookmark bar); if you'

It would have to appear outside the view-port. alert('blah') works like this in most browsers. In Chrome, it's subtle (it covers up your bookmark bar); if you're not paying attention, it'd be easy to fall for a spoof. There are times when I've clicked on a mock-up (trying to close it) thinking it was an actual window.