Example of a memory leak issue in IE and how to resolve it

dom-leak-fix.js

window.onload = function()
{
  var
  body = document.getElementsByTagName('body')[0],
  div  = document.createElement('div'),
  parentDiv, childDiv;
  for ( i = 0; i < 5000; i++ )
  {
    parentDiv = div.cloneNode(true);
    parentDiv.onclick = foo;
    childDiv  = div.cloneNode(true);
    childDiv.onclick = bar;

    // Doesn't Leak
    body.appendChild(parentDiv);
    parentDiv.appendChild(childDiv);
    body.removeChild(parentDiv);
    parentDiv.removeChild(childDiv);
    parentDiv = null;
    childDiv = null;
  }
  body = null;
}

dom-leak.js

window.onload = function()
{
  var
  body = document.getElementsByTagName('body')[0],
  div  = document.createElement('div'),
  parentDiv, childDiv;
  for ( i = 0; i < 5000; i++ )
  {
    parentDiv = div.cloneNode(true);
    parentDiv.onclick = foo;
    childDiv  = div.cloneNode(true);
    childDiv.onclick = bar;

    // Leaks
    parentDiv.appendChild(childDiv);
    body.appendChild(parentDiv);
    body.removeChild(parentDiv);
    parentDiv.removeChild(childDiv);
    parentDiv = null;
    childDiv = null;
  }
  body = null;
}