Last modified: 2010-09-29 02:24:46 UTC
Currently we test new banners on test.wikipedia.org which works well for basic banner verification but fails to capture project specific quirks. We've had a number of cases where a banner looks great in preview and test but looked horrible on the specific language/project due a local project/language customization that we had no anticipated.
We could possibly add a usebanner=blah or use a js based gadget to flip them on/off for testing.
Functionality has now been added, deployed, and documented.