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CSS if() function

Proposed by web-platform-tests/interop#1343
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The CSS if() function allows devs to use conditional logic to set property values.

This feature has shipped in Chrome 137, with some level of development happening in Firefox and Safari.

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Strict feedback template: Please be as concrete as possible. Specific examples from your production apps or projects provide the highest-value signal to standards editors and browser engineers.
Add your specific real-world use cases, even if they seem obvious to you.
0 / 5000 (min 10)
Are you having to use another feature instead, a polyfill, or is it blocking you completely? Why are the alternatives worse?
0 / 5000 (min 10)
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