I searched around and allegedly, body:nth-of-type(1) is used in CSS to target only Safari and Google Chrome.
Lo and behold, Mozilla reads it properly to
The @supports feature detection works for Chrome 28 and newer now.
/* Chrome 28+ */
@supports (-webkit-appearance:none) { .selector { color:red; } }
I posted this to browserhacks - so either test it at browserhacks.com or my live personal css hacks test site at http://browserstrangeness.bitbucket.org/css_hacks.html#chrome.
There are many others there that I have worked out for specific newer versions as well. I hope you enjoy them.