Used tools:
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* Sublime Text 3 with my repo: https://github.com/karolyi/st3-config
  * csslint
  * jshint
  * htmllint
* jQuery UI Widget Factory: http://jqueryui.com/widget/

Since a grid system is not provided, no grid system is used by default. All the positioned elements are pixel positioned.

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The data is loaded from the `data/cart.json` file at load time, and pushing the "Buy Now" button alerts the JSON format which would be posted to the REST API.