UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Example URL:
https://codepen.io/joao-silva/pen/qjGYpo

Steps to reproduce the problem:
pre-steps (this is someone else codepen, they may update, CSS has been backed up to https://pastebin.com/uWSWZitt/raw)

1. insert (hex) 20 C2 A0 before any css-property
2. load page (style for that property won't work)
3. look into inspector (now here FF & chrome seem to differ)
  a. FF does not show the extra character
  b. Chrome displays the extra character but it looks like a space

What is the expected behavior?
all whitespace (including C2 A0) to be trimmed from CSS property names

What went wrong?
failed to replace C2 A0 (multi-byte) with 20, or trim when parsing CSS property names (as far as I can tell).

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? No
 Mozilla Firefox for Ubuntu 54.0 (64-bit)

Chrome version: 59.0.3071.115  Channel: stable
OS Version: ubuntu xenial amd64
Flash Version: N/A

In 15 years on the web, I've never noticed this in any browser. It's likely user-behaviour should also be altered to not just copy->paste such characters, but it would be nice to have a bit of backup from chrome too.