Strange black line in Safari (full screen)

[KimHansenDK]

On my MacBook Air 2012 I see this strange black line on some website when viewing them in full screen. The problem is only there in Safari.

Was anyone experienced that? I have tried resetting the PRAM but to no luck. So I guess it is an issue with Safari. Maybe in combination with the Intel HD 4000? On my iMac mid 2011 the problem is not there.

It looks like this:

 

[Weaselboy]

It is not just you... it is an issue with the way Safari renders certain CSS layouts and Apple needs to fix it.

You can see the same line through the middle of the m in Forum Spy in my sceenshot.

 

[Ddyracer]

I'm good on the header, and no vertical lines either in safari.