I’m using Safari on my iPhone to browse the web more than I thought I would. Mobil Safari display pages very much like Safari on Mac OS X so it mostly works really well. A web design however rarely works well on both a big computer screen and a small handheld screen, even a high resolution one like on the iPhone.
I was not satisfied with the way xdeb.org looked on the iPhone. I wanted a simple way to improve it without the need for a separate theme or other more complicated solutions.