UserAgent: Mozilla/5.0 (X11; OpenBSD amd64; rv:47.0) Gecko/20100101 Firefox/47.0

Example URL:

Steps to reproduce the problem:
Open the attached HTML file.
See the rendering.

What is the expected behavior?
The two cells with input/select should have the same size.

What went wrong?
The cells with the select is much more smaller than the one with the input despite having both in css a width of 50%.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes 

Chrome version: 51.0.2704.106 (Developer Build) (64-bit)  Channel: n/a
OS Version: 
Flash Version: 

This happens only if the div #compute has a width set.
The size of the two cells is bigger if the second has a select then an input.
 

Deleted: test.html 1.5 KB

test.html 1.5 KB View Download