I learned about CSS Variables from Stefan Bauer and his post CSS Variables support for SPFx projects through spfx-uifabric-themes. In a nutshell, this npm package, which I’ve started using regularly, transforms the current theme colors available to the SPFx web part into variables that can be used within your SCSS/CSS files. This intrigued me as it’s a native browser capability that’s been around since 2015 and because it means that you can affect the styling at run-time vs build-time… which translated means that lots of things you would normally think you’d need script for you can now do with a crafty use of CSS and some variables.
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