Differences between using CSS custom properties in the :root selector versus the body/html tags

Why would you choose to define global CSS custom properties in the :root element rather than in the body or html tags? How might this decision impact the effects or performance of the page?

Answer №1

Initially, it may seem strange, but the key factor here is specificity. :root is essentially referring to html itself with a greater specificity level, hence why variables are placed within the :root element - not only for CSS but also for SVG and XML usage. This allows us to consider :root as a global scope due to its versatility. For more in-depth information on their distinctions, you can explore further details.

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