UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36

Example URL:
http://jsbin.com/vicuba/edit?html,css,js,output

Steps to reproduce the problem:
1. see http://jsbin.com/vicuba/edit?html,css,js,output
2. look at the inside of the border, compare to the outside
3. 

What is the expected behavior?
Both sides of the border should be properly antialiased

What went wrong?
The outside of the border is antialised as expected (that has recently been fixed, it used to be bad too).

However, the inside part seems to have no antialiasing at all. It looks TERRIBLE.

I am filing this separately from #390040 because that one is about the case where the bad aliasing occurs with a border applied to an outer element which contains an inner element. That case is probably more complicated (though I think it should be perfectly solvable).

This case on the other hand, is simpler, as the border is applied to the inner element. 

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? No 

Does this work in other browsers? No Firefox

Chrome version: 51.0.2704.79  Channel: n/a
OS Version: 
Flash Version: Shockwave Flash 21.0 r0