title: How does bootstrap create the "Example" tab on divs in their docs?
body: <p>I tried to look at the code but am unable to determine how this gets placed above the divs. Also, googling "tabs on div", "nested tabs on div" didn't seem to show anything relevant so my terminology is off.</p>
  
  <p><img src="https://i.stack.imgur.com/w7Ypu.png" alt="Example on Twitter bootstrap"></p>