UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Steps to reproduce the problem:
https://codepen.io/RichardDavies/pen/EwmOKd

What is the expected behavior?
No horizontal scrollbar appears in earlier versions of Chrome or in other browsers.

What went wrong?
Horizontal scrollbar appears below elements with certain CSS properties.

Did this work before? Yes 60

Chrome version: 61.0.3163.100  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

Possibly a duplicate of or related issue to https://bugs.chromium.org/p/chromium/issues/detail?id=769697