Clearly describe the bug

::-moz-focus-inner is treated as a pseudo-class, not a pseudo-element, and so can cause false positives in no-descending-specificity.

Which rule, if any, is the bug related to?

no-descending-specificity

What code is needed to reproduce the bug?

a::-moz-focus-inner {}
a 

Describe the bug
Keyframes names like those h1{ -webkit-animation: e836684w2 } h2{ animation: e836684w2 } with e at beginnig are trying to convert by postcss-convert-values

To Reproduce
Here is PR with failing test on this case
cssnano/cssnano#908

Expected behavior
Expected that no conversion performed

Screenshots

**Desktop (please comp

Would be great if you could create a custom plugin for stylelint that adds support for your custom rules; for example, making font-range a known property for the property-no-unknown rule.