This has been bugging me for a while, and apologies for poorly constructed title, but it seems like Google Chrome and Safari are the same thing on OS X.
I use Chrome exclusively on OS X Mountain Lion running on a MacBook Pro.
Occasionally, sites will be broken in that some functionality is not working correctly (e.g. video not playing on a ultra popular sites that I'm pretty sure are not just globally broken). In those cases I'll fire Safari to see if this is an issue with Chrome. I've tried this in 20 or so cases, but the behavior in Safari is always 100% identical.
Every single little issue I'm experiencing on Chrome will be exactly the same on Safari. As if it's the same browser with a different shell around it. In the past I've done web development for nearly a decade and knowing how sensitive some things are between browsers – it's just hard to believe that there's never been a different behavior and all the same things are broken on Safari.
update
i forgot to mention i've also been checking using Firefox.
other examples are links not working. for example on nieman marcus i can load initial search, but none of the links work on chrome/safari (such as "next" or "120")
however in this particular example firefox works.. so it indeed could be webkit related. has anyone had similar experience?