I've got to add my two cents here since the "pretty" argument and "CSS 
designer" bit has irked me over the years.

There is a clear impedance mismatch between what a CSS/HTML designer can 
kick out from a graphical suite, and what is a truly robust, reusable 
component.

   1. You must protect the CSS namespaces. Just because Mockup A looks 
   good, does not mean it will work well together with Mockup B on Page C.
   2. The CSS in mockups can be quite fragile and verbose, not being well 
   suited to componentization (i.e. depending on x:nth-child(4), x:last-child) 
   when you now have N entries and M instance of the widget on the page.
   3. Various transitions and UI changes in the mockup should be triggered 
   by changing a single class, not manually applying myriad style changes like 
   "right:33px" and "opacity:0.34". Otherwise the devs need to rework the CSS 
   themselves.

Frankly "mockups" can be misleading and make a product look functionally 
complete, even though as coded they cannot be robustly implemented. Such 
things however are not a flaw in GWT, but a need to design for reuse 
and extensiblilty at the mockup stage. So be sure to set some requirements 
for your designers to be GWT friendly and the code should be easy to 
implement.


Sincerely,
Joseph

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