Custom properties, aka CSS variables, are runtime dynamic variables which allow you to store loose or typed values. They're free, super fast, improve code legibility, unlock powers, are reachable with JavaScript, animateable, overall super fun and, well, kind of complex.
Links
Module Level 1 → https://goo.gle/3wtADL1
82% of developers get this 3 line CSS quiz wrong → https://goo.gle/2U8oTPR
A user's guide to CSS variables → https://goo.gle/3zlmscV
Locally Scoped CSS Variables: What, How, and Why → https://goo.gle/2KGESwR
GitHub → https://goo.gle/3iOiVOa
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