I am working on a UI viewer, with the potential to edit, that works in browser.
The goal is to be able to pull XML files and such from this type of site, display (edit?) and then download the modified XML, or submit it back to here.
You can view a sample here
http://equieditor.webatu.com/equi/.
The images sometimes don't load right away and you much choose another item in the dropdown. Most items will show something if they are placed correctly for in-game viewing.
Check "PlayerWindow" for the best demonstration.
Source code can be found
https://github.com/adam4813/equi. The HTML is going to be cleaned up remove an extra "div" tag next commit.
Gauges, buttons (normal, hover, and pressed), images (with multiple frames), and labels work to some degree right now. Screen elements just loop through and show all the pieces with the correct offsets.