It's still not a drop-in replacement, but it's close. You need to include more modules than just the core for eg. ajax or transition effects (the official modules are all available from http://zeptojs.com and/or the github linked there). I maintain a pretty hefty Backbone based web app where we use Zepto for mobile/non-IE to save on file size, and serve the exact same code but with jQuery for IE. In about a thousand lines of code, there are only 3 or 4 edge cases where the code paths diverge for a line or two, and they're due to IE peculiarities rather than Zepto/jQuery conflicts.
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It's still not a drop-in replacement, but it's close. You need to include more modules than just the core for eg. ajax or transition effects (the official modules are all available from http://zeptojs.com and/or the github linked there). I maintain a pretty hefty Backbone based web app where we use Zepto for mobile/non-IE to save on file size, and serve the exact same code but with jQuery for IE. In about a thousand lines of code, there are only 3 or 4 edge cases where the code paths diverge for a line or two, and they're due to IE peculiarities rather than Zepto/jQuery conflicts.
You should have a look at this page for a comparison of javascript frameworks on mobile devices:
http://www.codefessions.com/2012/08/performance-of-jquery-co...