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1. Trigger a notification
2. Click on the notification to dismiss it
3. The notification area (<div id="mw-notification-area">) is now empty, but still obscures a narrow strip in the top right corner:

> $('#mw-notification-area').outerHeight()
12
> $('#mw-notification-area').outerWidth()
269
> $('#mw-notification-area').position()
Object {top: 89.59375, left: 1251.203125}
> $('#mw-notification-area').css('z-index')
"10000"

This is a problem because the div steals events and mouse interaction from the UI elements below it. For instance, in VisualEditor:
1. Open a page in VE
2. Type '[['. The wikitext warning appears
3. Click the warning to dismiss it
4. Reveal #mw-notification-area in the inspector and observe how it's on top of part of the save button
5. Very carefully move the mouse over the save button, and you'll notice a small (12px tall) area where mouse pointer is a normal pointer instead of a hand. Clicking in this area does not press the save button.