Those looking for IE/legacy support for CSS custom properties (i.e. "CSS variables") can check out css-vars-ponyfill. Forgive the self promotion (I am the author), but I thought it would be helpful for those still burdened--as I was not too long ago--with IE/legacy support.
This is great John! Also thank you for being so transparent. I'll add it to my code notes in the community section 😊
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