I was wondering how I can achieve effect like on this page: http://ift.tt/1EnJuuw
On the left side there is panel which allows to adjust template. What I noticed is that I change color, different css is beeing used (blue.css, purple.css etc.) however everything happends "on fly" without reloading web page.
How was it achieved?
Can that be also applied to other elements on webpage like i.e. background changed from picture to video?
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