Drag and Drop (DnD)

Test: code example from: § 5.7.1 of the w3c HTML 5.2 Recommendation, 14 December 2017 (second example)
and the same example in: html.spec.whatwg.org/multipage/dnd.html#the-draggable-attribute

What fruits do you like?

  1. Apples
  2. Oranges
  3. Pears

Drop your favorite fruits below:

<ol id="dropArea" style="background: yellow" 
   ondragenter="dragEnterHandler(event)" 
   ondragover="dragOverHandler(event)"
   ondrop="dropHandler(event)">
</ol>

Drop area is an empty OL, has no surface, and dropping is impossible.
Give the OL a min-height of 2em.