title: How to set DOM element as first child?
body: <p>I have an element E and I'm appending some elements to it. All of a sudden, I find out that the next element to append should be the first child of E. What's the trick, how to do it? Method unshift doesn't work because E is an object, not array.</p>
  <p>Long way would be to iterate through E's children and to move'em key++, but I'm sure that there is a prettier way.</p>