From http://www.satzansatz.de/cssd/pseudocss.html#fltadjacent "Now, when such a .ipsum construct gains "layout" by a subset of layout properties (position: absolute; / float: any value; / display: inline-block; / zoom: 1;), what will happen? Right. Some will have to cancel the frozen process, others will have to reboot, data gets lost. Don't do it. (No, I don't link to a testcase here. IE7b3 is still crashing after scrolling/resizing. Depending on the memory already burned, you might have difficulties to stop the process...)"I created this test manually (save http://www.satzansatz.de/cssd/pseudocss/pseudocss_t004.html and add zoom: 1 to .ipsum) and not only this bug is still in final IE7, I also noticed that there is also a potentially exploitable crash bug by opening the about box after opening this page. When this happens, it crashes with EIP at an invalid address.After this, by adding onclick="window.showModalDialog('target.htm')" to

, creating the target.htm, then opening the page and clicking inside the box, I triggered various crashes including attempts at executing data (note that IE7 do not enable DEP by default) and heap termination on corruption.I turned full pageheap on and after I did so it crashes reliably at:MS fixed this bug in the May 2013 Cumulative Update for IE6 and IE7.Here is http://www.satzansatz.de/cssd/pseudocss/pseudocss_t004.html rendered in IE6 and IE7 before the patch:After the patch (notice it is the same rendering as IE8+ in IE7 compat mode):