Wait... IE9 the very first browser designed to be compliant with web standards?
The first IE for sure, but Opera has been complying with web standards for years, it was even co-founder of a few, including CSS. Chrome, even though it doesn't exist as long as Opera, has also been complying with all web standards. Firefox isn't fully compliant, but does a very good job too. Hell, even Safari, made by a company that usually ignores standards, is more compliant than IE 8.
And to make matters worse, IE 9 isn't even fully compliant. In other news, it's no faster than FF, not extensible and lacking in features.