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What's the CSS playground?

What’s the CSS playground ?

This seems to be hidden; I don’t know where to find a link from the site except the direct link (

It seems to use an old interface but there seems to be more advanced features than the standard interface, like being able to rotate the screens view (tablet and phone).

I’m wondering why it’s not featured proeminently on the site.
The exemples look very useful, I’d thought they might have a place in the tutorials.


i looked - what is this playground.