noUnknownFunction

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Summary

Rule available since: v1.8.0
Diagnostic Category: lint/correctness/noUnknownFunction
This rule is recommended, which means is enabled by default.
This rule doesn’t have a fix.
The default severity of this rule is error.
Sources:
- Same as stylelint/function-no-unknown

How to configure

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{
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  "linter": {
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    "rules": {
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      "correctness": {
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        "noUnknownFunction": "error"
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      }
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    }
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  }
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}

Description

Disallow unknown CSS value functions.

This rule ignores double-dashed custom functions, e.g. --custom-function().

Data sources of known CSS value functions are:

MDN reference on CSS value functions
MDN reference on CSS reference
MDN browser compatibility data for CSS value functions

Examples

Invalid

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a { transform: unknown(1); }

code-block.css:1:16 lint/correctness/noUnknownFunction ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected unknown function: unknown
  
  > 1 │ a { transform: unknown(1); }
      │                ^^^^^^^
    2 │ 
  
  ℹ Use a known function instead.
  
  ℹ See MDN web docs for more details.

Valid

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a { transform: scale(1); }