title: Struts tiles visual debugging
body: <p>At a previous job they had a debug mode that would highlight struts tiles in the browser so you could tell what each tile was doing and the tile's filename.  This was enormously helpful for when you are lost in a forest of nested tiles.  Now that I'm at a new struts place, I've been trying to figure out how to implement it but I'm coming up empty.  Any ideas?</p>