Currently, there isn't a straight forward solution to generate a desktop web site and mobile apps from the same source but you could consider using Kendo UI with a couple of other technologies to produce the needed result:
There are concepts shared between the different Kendo UI libraries that will allow you to re-use parts of your code. Especially, if you create a SPA web site that accesses data via web services. You could use the same web services and data retrieval code to bind your mobile app, too.
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