Using experimental feature: HTML5 Conformance Checker.
The validator checked your document with an experimental feature: HTML5 Conformance Checker. This feature has been made available for your convenience, but be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies. If you find any issues with this feature, please report them. Thank you.
It is also broken (a bit) in IE8. You went to the trouble of using a conditional comment that didn't work.
[Line 10, Column 54: Bad value X-UA-Compatible for attribute http-equiv on element meta.
<meta http-equiv="X-UA-Compatible" content="chrome=1">
If you view the page with scripting turned off, the content is non existant. Look at the cached text view of the page. There is no content there for the bots to read either.