title: Is it possible to vertical-center an element (span, div, whatever) due to the body height?
body: <p>The question is clear, I hope.</p>
  
  <p>I have the body of the DOM (which should be any height, thinking to a user that reside the window) and I'd like to center (in vertical) an element (which can contain other children, but this doesnt mean).</p>
  
  <p>Is it possible? Maybe using a table? I'd like to avoid Js...</p>