"The CSS if() function introduces real conditional logic to CSS. It allows you to write conditions inline instead of relying on media queries or workarounds : Works with style() , media() , and supports() queries for theming, responsive tweaks, and state-based styling Fits property-level decisions, while media and container queries still handle broader layout changes Supports nested logic and pairs well with calc() for advanced patterns Currently supported only in Chromium browsers, so use progressive enhancement and @supports checks"
"In the past, when we needed conditional styles, we relied on approaches like: Media queries for responsive breakpoints Custom property toggles with calc() and clamp() Container style queries for parent-based conditions Multiple selectors with different specificity The if() function replaces these patterns by providing a better declarative way to apply different values based on specific conditions. Instead of writing separate rule blocks or complex calculations, we can express conditional logic inline within our property declarations: Syntax@media (condition) { .selector { property: value; } }property: if(condition: value; else: fallback);"
The if() function adds true conditional logic to CSS by allowing inline conditional expressions within property declarations. It integrates with style(), media(), and supports() queries for theming, responsive tweaks, and state-based styling. The function supports nested logic and pairs well with calc() for complex patterns, while media and container queries remain appropriate for broader layout changes. The feature replaces verbose workarounds such as multiple @media blocks, custom property toggles, and multiple selector rules by centralizing conditional choices per property. The syntax uses property: if(condition: value; else: fallback); and current browser support is limited to Chromium, so progressive enhancement and @supports checks are recommended.
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