mootools/mootools-core — Issue #2113: Element object can't create a button with the type of button.
Author: tvanreenen
Created: 2011-10-27 14:59:00+00:00
State: open

The fiddle should be able to explain it all. I doubt this is a bug with MooTools. But, it does seem like a behavior that MooTools should be compensating for.

http://jsfiddle.net/tvanreenen/nHpVc/