Tips and tricks
The different layers of the various MV* patterns need not all be on the browser, nor do they all need to be written in JavaScript. Many popular frameworks allow for maintaining a model on the server and communicating with it using JSON.
Object.observe may not be available on all browsers yet, but there are polyfills that can be used to create a similar interface. The performance is not as good as the native implementation, but it is still usable.
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