UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36

Example URL:
https://jsfiddle.net/d78ugn7z/1/

Steps to reproduce the problem:
1. multiple fieldset/divs with multiple button elements
2. buttons fixed size, in one group text will overflow (however slightly)
3. resulting fieldset  height off by 0.5 pixels, affecting flow of floating fieldsets.

What is the expected behavior?
fieldsets/divs should have the exact same height as the elements they contain are all the same height. This is behavior on all other browsers tested (firefox, IE)

What went wrong?
layout of floating fieldsets or divs visually wrong, leaving large gaps. This happens with or without the legend or border. various styles applied to attempt consistency but only workaround is to hardcode the height of the fieldset, which breaks if one set has more than one line worth of buttons.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? Yes not sure, within last 30 days.

Does this work in other browsers? Yes

Chrome version: 62.0.3202.94  Channel: stable
OS Version: 10.0
Flash Version: 

simplest repro case in jsfiddle. No javascript involved.