Fix CSS Path Errors by Setting Resource Root Folders In PHPStorm

While developing a plugin for WordPress I was having trouble linting CSS files in PHPStorm. One file in particular was giving hundreds of false positives for errors related to paths:

False positives
The right side gutter is all red but most of these errors are wrong.

This bothered me. I wanted to fix the reported errors but the reporting was wrong. Most of the time there was nothing to fix. After much fiddling I discovered files under a folder marked as Resource Root can be referenced as relative:

Resource Root
To fix the above, set Resource Root(s) in PHPStorm

Low and behold the errors became real! Oh crud, time to fix.

Real errors
Now the right side gutter shows actual errors (that I should fix!)

Source:

https://www.jetbrains.com/phpstorm/help/configuring-folders-within-a-content-root.html

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