My problem with your question is the evergrowing lack of critical thinking on HN. I think even PG has eluded to it.

What's the difference from Bootstrap? Why don't you view its source? Read through the framework's documentation? For one the default styling is significantly different than Bootstrap.

The one thing I fondly miss about Slashdot is people would liberally tell you to RTFM when you asked something obvious that could have been answered by reading the article posted.