OK, so the title is mine, but you can see here how the defacto standard that was IE4/5/6 meant that people thought IE7 would live by the same rules. If you care about "standards based websites" then the IE team blog on compatibility is a must for you. Compatibility and IE8 In Dean’s recent Internet Explorer 8 and Acid2: A Milestone post, he highlighted our responsibility to deliver both interoperability (web pages working well across different browsers) and backwards compatibility (web pages working well across different versions of IE). We need to do both, so that IE8 continues to work with the billions of pages on the web today that already work in IE6 and IE7 but also makes the development of the next billion pages (in an interoperable way) much easier. Continuing Dean’s theme, I’d like to talk about some steps we are taking in IE8 to achieve these goals. I’ve been on the IE team for over a decade, and I’ve seen us apply the “Don’t Break the Web” rule in six different major versions of IE in different...