Lightly Poking at the CSS if() Function in Chrome 137 | CSS-Tricks
Briefly

The CSS if() function has been officially released in Chrome version 137, representing a significant leap in CSS development. This function enables developers to apply conditional styling in a more streamlined way compared to traditional methods. While conditional statements are common in CSS, the if() function allows them to be utilized in a single property, promoting efficiency and innovation in styling. Initial syntax variations were explored prior to its launch, indicating a focus on flexibility and depth in application that goes beyond previous capabilities.
We can typically expect this sort of thing to develop over a number of years before we can get our dirty hands on it.
Conditional statements exist everywhere in CSS, from at-rules to the parsing and matching of every statement to the DOM.
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