Reality. It is important to make sure IE also complies with <a href="http://techrights.org/2010/09/17/internet-explorer-9-bad-news/">CSS, SVG, and HTML 1-4</a>. When you ignore these things, what you get looks like <a href="http://techrights.org/2010/10/16/acid-test-and-winphone7/">Windows 7 Mobile does</a>.
Expecting Microsoft to do anything but promote themselves at your expense is as foolish as expecting their "privacy settings" to work. Is that really a company that should have a seat on the W3C board?