UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Example URL:

Steps to reproduce the problem:
CSS rule[:before -> content] must override other rules on a stack but the rules are multiplicationing. Is it normal?

What is the expected behavior?
CSS rule must override other rules on a stack.

What went wrong?
Rules are multiplicationing.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? No
 Firefox ESR

Chrome version: 61.0.3163.100  Channel: stable
OS Version: Debian 9
Flash Version:
 

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