"After years of developer frustration and questions on online forums, it's finally happening: CSS is getting an if() function to apply styling when a condition is met. For the first time, developers can make logical decisions directly in stylesheets, without separate code blocks. This opens up whole new possibilities for web designers. CSS is a mature styling language that determines how web pages look."
"How does the if() function work? The if() function is based on the JavaScript if...else function. Developers can compare an if statement to a variable value. The function accepts an ordered list of statements, each consisting of a condition or variables and a value, separated by a colon. The condition can be based on a style query, media query, or feature query. The syntax consists of an if test or the else keyword, followed by the desired values."
"Long-awaited if functionality now available For years, developers and designers have been asking on online forums whether CSS supports if() and else() statements. Although workarounds were available, they did not work well. That is now changing with the latest update, because the W3C has finally added the if() and else() functions to the CSS standard. The function builds on previous work that enabled developers to define variables."
CSS now supports if() and else() functions that allow conditional property values inside stylesheets. The functions build on earlier variable support and accept an ordered list of condition:value pairs separated by colons. Conditions can reference style queries, media queries, or feature queries, and the syntax uses if tests and an else keyword followed by values. Examples include setting background colors based on --scheme values and adjusting margins via media(width > 700px). The 2025 W3C update added these functions. Browser vendors must implement the new features before developers can use them ubiquitously.
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