title: div fadeIn and fadeOut (on append and remove from DOM) with CSS only. Is it possible?
body: <p>I'm using jQuery for append and remove a div on DOM.</p>
  
  <p>I need a CSS method to <code>fadeIn</code> and <code>fadeOut</code> that div with a simple transition, (maybe also just opacity).</p>
  
  <p>But what I need is to not use jQuery <code>addClass</code> or <code>animate</code>: just CSS!</p>
  
  <p>Is it possible?</p>
  
  <p>Maybe I can use animate.css library? But there is just fadeIn or fadeOut method, not both at the same time. And I cannot use javascript for adding/remove classes.</p>