html - contenteditable double click selection bug or feature? -

here: https://jsfiddle.net/xuw0m552/1/

  <div contenteditable="true" style="background-color: #dadada">asdasda asdasdas</div> 

background set you can see block's boundaries , know click

if double click inside div on right entered text selects last word (correct behavior)

and here: https://jsfiddle.net/5gupslb1/1/

  <div contenteditable="true" style="background-color: #dadada">asdasda asdasdas</div>   <div>111111</div> 

if div has closed </body> tag after - double click nothing.

question: how fix that? , why happening?