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It fires when a modifier key is pressed but not when it is released. I'm not sure if this is due to browsers not supporting it or not. If that is the case there should be something in the source to indicate this.
Currently it says it notifies the receiver that the user has pressed or released a modifier key (Shift, Control, and so on).
Actually it was just a bug...
Fix is here: http://github.com/BlairDuncan/cappuccino/commit/5ef16409e8d245ddd73a26cca451b058bb7c30a9
Label: #new. What's next? A reviewer should examine this issue.
This fix was merged: https://github.com/cappuccino/cappuccino/blob/master/AppKit/Platform/DOM/CPPlatformWindow%2BDOM.j#L851
Milestone: 0.9.7. Label: #fixed. What's next? This issue is considered successfully resolved.