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CSS Values and Units Module Level 4

https://w3.org/tr/css-values-4

“The value definition field of each CSS property can contain keywords, data types (which appear between < and >), and information on how they can be combined. Generic data types (<length> being the most widely used) that can be used by many properties are described in this specification, while more...” (from the page’s text)

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Last read: 8 Oct 2026
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