<dashed-function> | CSS Types & Functions

An experimental type of CSS function name that starts with two dashes (like '--foo()'). It's intended to be used for custom, user-defined functions in the future.

Quick example

/* Future CSS: Using a custom dashed-function */
.element {
  --custom-anim: --my-logic(500ms);
}

<dashed-function> Browser Support

Limited availability 67% global usage

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Not ready for production without a fallback.

View on caniuse.com → View on MDN → View on webstatus.dev → View spec → Learn more about Baseline →

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