Everything, Everything

I've been using the beta and RC for a while and I'm quite happy with how stable it's been (I remember the good old days when even the release candidates of IE would make a system blue screen), so I'm looking forward to the final version when it's released on March 14th.

Sadly it seems to be bringing out the crazies. One person commented on the IEBlog:

"Our websites will break for all our customers if they upgrade to IE9"

If they do then it's their fault, not Microsoft's. My website, although fairly basic in its use of CSS and JavaScript, didn't need any changes to be made. Nothing broke. It looks identical to IE8 (and other browsers).

1. You can change the "Document Mode". Ways to force IE9 to emulate IE7 or IE8 were posted almost a year ago on the IEBlog. It's as simple as adding a custom HTTP header (X-UA-Compatible) to your affected website (the same technique used when IE8 was released), or you can use a meta tag if you don't have full control over the web server.
2. IE9 has been available as a technical preview, beta and Release Candidate for a very long time. It wasn't even limited to TechNet subscribers; the whole world could download them. There has been plenty of time for developers to code websites to work with IE9, and in many cases the IE team have blogged on good ways to detect JavaScript features before using them.