As usual, the first thing I tried after installing the Internet Explorer 9 beta last week was to see how it handled all of my websites. It does just fine with everything except this one. It shifts the header image off to the right. This is particularly odd because it’s just the standard Twenty-Ten theme that’s the default for WordPress 3, customized with one of my own photos.
Oddly, it was just fine in the last IE9 preview. Even stranger, the sample 2010 page looks just fine. It’s not my customizations, though. I’ve checked on two other locally-installed WP sites.
Is it worth fixing in WordPress?
I haven’t found any indication as to whether this is a bug in the IE9 beta or a deliberate change. If it’s a deliberate change, it’s an odd one, because it takes behavior that used to be the same as every other web browser out there and changes it to something different. If it’s a bug in IE, though, that’s where it should be reported and fixed, not in just one of the sites affected.
That said, I’m probably going to try the workaround on at least one of my sites the next time I get on a machine with IE9.