Margin Auto in Internet Explorer 10/04/11

The css property margin:auto works in IE as long as you specify a full and proper doctype, for example:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

I did not know this until today.