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noUnknownProperty

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Disallow unknown properties.

This rule considers properties defined in the CSS Specifications and browser specific properties to be known. https://github.com/known-css/known-css-properties#source

This rule ignores:

  • custom variables e.g. --custom-property
  • vendor-prefixed properties (e.g., -moz-align-self, -webkit-align-self)
a {
colr: blue;
}
code-block.css:2:3 lint/correctness/noUnknownProperty ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Unknown property is not allowed.

1 │ a {
> 2 │ colr: blue;
^^^^
3 │ }
4 │

See CSS Specifications and browser specific properties for more details.

To resolve this issue, replace the unknown property with a valid CSS property.

a {
my-property: 1;
}
code-block.css:2:3 lint/correctness/noUnknownProperty ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Unknown property is not allowed.

1 │ a {
> 2 │ my-property: 1;
^^^^^^^^^^^
3 │ }
4 │

See CSS Specifications and browser specific properties for more details.

To resolve this issue, replace the unknown property with a valid CSS property.

a {
color: green;
}
a {
fill: black;
}
a {
-moz-align-self: center;
}
biome.json
{
"linter": {
"rules": {
"correctness": {
"noUnknownProperty": "error"
}
}
}
}