UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.75 Safari/537.36

Example URL:
https://jsfiddle.net/ckpw5a9x/

Steps to reproduce the problem:
Check out the fiddler code, the legend on the fieldset has a float style that is not being applied correctly

What is the expected behavior?

What went wrong?
The legend is not visible and the input boxes are to the far right instead of flush with the browser window on the left.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? Yes The version before 55.0.2883.75

Does this work in other browsers? Yes

Chrome version: 55.0.2883.75  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 23.0 r0