UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Steps to reproduce the problem:
1. Write a ::marker style rule.

What is the expected behavior?
CSS bullet changes based on style rule.

What went wrong?
Does not. Spec not implemented. 

Did this work before? No 

Does this work in other browsers? No
 Spec https://www.w3.org/TR/css-lists-3/#marker-pseudo-element

No browser implements. http://caniuse.com/#feat=css-marker-pseudo

It's useful to colorize bullets. 

Chrome version: 59.0.3071.115  Channel: stable
OS Version: 10.0
Flash Version: