property-no-unknown

Disallow unknown properties.

a { heigth: 100%; }
/** ↑
 * This property */

This rule considers properties defined in the CSS Specifications and browser specific properties to be known.

This rule ignores:

• variables ($sass, @less, --custom-property)
• vendor-prefixed properties (e.g., -moz-align-self, -webkit-align-self)

Use option checkPrefixed described below to turn on checking of vendor-prefixed properties.

Options

true

The following patterns are considered violations:

a {
  colr: blue;
}

a {
  my-property: 1;
}

The following patterns are not considered violations:

a {
  color: green;
}

a {
  fill: black;
}

a {
  -moz-align-self: center;
}

a {
  -webkit-align-self: center;
}

a {
  align-self: center;
}

Optional secondary options

ignoreProperties: ["/regex/", /regex/, "string"]

Given:

["/^my-/", "custom"]

The following patterns are not considered violations:

a {
  my-property: 10px;
}

a {
  my-other-property: 10px;
}

a {
  custom: 10px;
}

checkPrefixed: true | false (default: false)

If true, this rule will check vendor-prefixed properties.

For example with true:

The following patterns are not considered violations:

a {
  -webkit-overflow-scrolling: auto;
}

a {
  -moz-box-flex: 0;
}

The following patterns are considered violations:

a {
  -moz-align-self: center;
}

a {
  -moz-overflow-scrolling: center;
}