Moving to mobile: Compatibility headaches everywhere

Web browser usage is rapidly shifting away from desktop computers and
toward mobile devices. Unfortunately for web developers, the compatibility
problem in the mobile world has been much worse than it was in the heyday
of desktops.Not only have web designers had to work with a very wide variety of web
browsers, which each support a different set of features — they also have
had to work with widely different screen sizes and platform capabilities.
Mobile web nightmares
Whereas on desktop browsers, you can pretty much count on being able to
display pictures and run JavaScript, these features were not at all standard
on mobile phones.
Mobile phones were — and still are — stuck with a huge mess of browsers
and layout engines that all did their own thing, and a variety of different standards
for Mobile app development that not many people have taken the time
to learn.