Style guide: comments on alert

Comments:
1. Space, Escape and Enter only make sense to close an alert if focus is 
inside the alert
2. If focus was actually in the alert, it should be an alertdialog, not an 
alert
3. Therefore alert doesn't necessarily respond to keys to close it, 
because the focus may be elsewhere
4. In the example linked to, the keys don't work anyway. This is probably 
because it's an alert and not an alertdialog
5. Alertdialog is not listed in the style guide

Alert
Space, Escape and Enter Close alert box, focus moves back to text box 
Example: 
http://devserv.rehab.uiuc.edu/ita/jongund/citaweb/test/aria/alert/alert1.php