That's a different question. It's similar, but the situations aren't really the same. Developing a desktop app that runs on multiple OSes either involves using

That's a different question. It's similar, but the situations aren't really the same. Developing a desktop app that runs on multiple OSes either involves using something like Gtk and probably having a noticeably non-native app on at least some systems or writing separate user interface code for every platform. I don't have much experience in web development(or desktop development for that matter), but given that all commonly-used browsers share at least a certain subset of HTML, CSS, and Javascript, is it really as hard as creating a desktop app that looks native on every major platform? Since there's no such thing as a native look for web apps, it's not really something you have to worry about, so you just have to deal with the differing HTML/CSS/Javascript implementations across browsers. Besides, an organization is and far more likely to switch browsers than to switch OSes because changing browsers is a less dramatic change that is less disruptive to their old way of doing things.