As I already mentioned previously I've been working on a hybrid webapp (one part native mobile, on part HTML/JS/CSS). We are lucky to only be targeting iOS 6+, Android 4+ and Windows Phone 8+. While mobile browsers on these platforms are quite capabable they sure come with a few quirks that we have had to workaround.
This is an attempt at listing all the issues and workarounds for my own reference but hopefully someone may find this useful as well.
I'll try and update this list when ever we find something new, or I remember something else we've attempted to fix.