title: Access HTML data- attribute with JS, WITHOUT using .getelementbyid?
body: <p>Let me keep is simple.  Scrollit.js, you set a data-scroll attribute on the navigation link, and a data-index where the content you want it to scroll to.</p>
  
  <p>You don't need to set a specific ID on either thing for it to work.  So why when I am reading about using data- attributes, the JS always starts with getelementbyID(#..)?</p>
  
  <p>I'm looking to put together a micro-framework that uses this.</p>