4chan still has some code making most of the website render properly on old versions of Internet Explorer. However, clicking [Post a Reply] does nothing and for some reason the catalog doesn't work so while you can still read 4chan on old versions of IE you can no longer post on it. Things that are different in IE are that clicking a file opens it in a new window instead of expanding it and there is no drop-down menu beside each post (you would click the checkbox and press the delete or report button at the bottom of the page). A certain other website also renders properly on old versions of IE if you use the right address.