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There are much more serious omissions if you're trying to build a web app that works with Apple devices. For example, despite all the protestations about how necessary it was to kill off Flash and use HTML5 for playing multimedia content instead because Plugins Are Evil(TM), it is actually a plugin rather than Safari that is playing a video when you visit a site on an iPhone or iPad. As soon as you want to do anything interesting with all the extra power that making audio and video just two more types of content on the Web should bring... even basic stuff just doesn't work. Except for every major device but Apple ones, that is.