Does orientation of code affect result?

Question

I wrote this code in jsbin. Here is the link. I wrote the code like this :

<div id="container">
  <div id="elem" onclick="clone()">  
  </div></div>

Then I pressed enter before the last < /div >. The code became like this :

<div id="container">
  <div id="elem" onclick="clone()">  
  </div>
</div><!-- ONLY THIS LINE WAS CHANGED -->

After I pressed enter before the last < /div >, the code doesn't work anymore! This really confuses me. How can that happen?

Answer 1

This is Teemu's answer :

lastChild finds the last node, including white-space characters and new-lines in the source code. Use lastElementChild to refer HTML elements only.