What technologies are visual order editors based on?

Question

PHP

There was a need to create a visual order designer for the site. Something like this: www.siduhi.ru/constructor.html
With the help of what is it more competent to implement this? And where it is possible to be enlightened about such things, if something similar has already been met?

Answer 1

Just a set of backgrounds, look at the debugger in the browser, it's faster than asking.

Answer 2

What is the best way to implement something like this?

Unity3D (HTML5)