r/css • u/jaffathecake • 5d ago

Article Controlling when CSS custom property values are computed

https://jakearchibald.com/2026/css-custom-property-compute-time/

I didn't understand how this worked until recently, I only knew that @property changed the results. Anyway, I figured it out, and wrote up what I learned. I hope this is useful for others!

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u/testingaurora 1d ago

I had a similar use case except was using the custom property for sibling-index() on a pseudo element. I hadnt realized that registering it would make this difference! Thank you!