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A.A. Milne’s Winnie-the-Pooh: “If you live to be a hundred, I want to live to be a hundred minus one day so I never have to live without you.”
A.A. Milne

env()

The env() CSS function can be used to insert the value of a user agent-defined environment variable into your CSS, in a similar fashion to the var() function and custom properties. The difference is that, as well as being user-agent defined rather than user-defined, environment variables are globally scoped to a document, whereas custom properties are scoped to the element(s) on which they are declared.
env() css reference