CSS3 structural pseudo-class selector tester

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I was doing some research today about how people explain the CSS3 structural* pseudo classes and I stumbled upon this demo by CSS tricks: http://css-tricks.com/examples/nth-child-tester/

I thought the idea is awesome, but lacks a few features:

So, I decided to code my own. It allows you to test for all 4 nth-something selectors, supports adding/removing elements (the selected elements update instantly) and uses the native browser implementation to select them (so it won’t work on IE and old browsers).

Enjoy: CSS3 structural pseudo-class selector tester :)

*Yes, :root and :empty also belong to those, but are rarely used. All other structural pseudoclasses are actually shortcuts to some particular case of the aforementioned 4 :)