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The implementation just smacks of AngularJS. In fact, implementing something like this would be just short of trivial using Angular...!

If you like the concept of "extending html" as used here then you should probably checkout AngularJS: http://angularjs.org

This looks more like Bootstrap to me. There is no "extending" going on, just adding some data-attributes to the markup.

At first glance, this looks like the best validation library I have seen. It so hard to find validation libs, that don't get into your way.

Sometimes you just don't have or don't need angular or other js framework and just simply want to validate a form ;)

Yes quite, it is nice that is framework independent.