Early in my career I worked on a carrier's mobile internet portal in the days before smartphones. It was XSLT all the way down, including individual XSLT transforms for every single component the CMS had for every single handset we supported (hundreds) as they all had different capabilities and browser bugs. It was not that fun to write complex logic in haha but was kind of an interesting thing to work on, before iPhone etc came along and everything could just render normal websites.