title: Vertical "tab" component on jQuery UI site
body: <p>jQuery UI features a nice-looking "vertical tabbing" widget to switch between chapters <a href="http://jqueryui.com/demos/tabs/" rel="nofollow noreferrer">on its own website.</a> </p>
  
  <p><img src="https://i.stack.imgur.com/wVzJS.png" alt="enter image description here"></p>
  
  <p>Does anybody know whether this builds on some kind of standard widget (you <em>would</em> expect that UI's very own "tabs" component is being used for this, but no dice!), or whether it is something custom made? A cursory glance at the code makes me suspect the latter..... This would come in very handy in a project I'm working on.</p>