Microsoft decides CrashIE.com bug not worth fixing

  Thank you for your feedback. At this time we do not plan on fixing this issue.
  Your feedback is very important to us, and it helps us improve the quality of
  Internet Explorer. Unfortunately, we are currently unable to address this
  particular feedback. We have addressed the crashing issue, but the page currently
  results in a hang. We decided not to fix beyond this because the scenario
  is narrow as it only affects invalid markup and our Watson data confirms this is
  a rare issue.
  It also does not occur in IE 7, 8, and 9 rendering modes (modern web page
  standards). We continue to welcome more feedback, so please don't hesitate
  to report other ways that we can improve Internet Explorer.
  Best regards, The Internet Explorer Team