at-rule-descriptor-value-no-unknown

禁止在规则中使用未知值描述符。

¥Disallow unknown values for descriptors within at-rules.

@counter-style foo {
  system: unknown;
/**       ↑

 * Values like this */
}

此规则认为 CSS 规范中定义的描述符和值（包括编辑草稿）是已知的。

¥This rule considers descriptors and values defined in the CSS Specifications, up to and including Editor's Drafts, to be known.

你可以过滤 CSSTree 语法参考 以找出哪些值对于 at-rule 的描述符有效。

¥You can filter the CSSTree Syntax Reference to find out what values are valid for a descriptor of an at-rule.

此规则仅适用于 CSS。你不应该为类似 CSS 的语言（例如 SCSS 或 Less）启用它。

¥This rule is only appropriate for CSS. You should not turn it on for CSS-like languages, such as SCSS or Less.

message 次要选项 可以接受该规则的参数。

¥The message secondary option can accept the arguments of this rule.

此规则检查 at-rules 中的描述符值。你可以使用 declaration-property-value-no-unknown 禁止声明中的属性的未知值，使用 at-rule-descriptor-no-unknown 禁止 at-rules 中的未知描述符。

¥This rule checks descriptor values within at-rules. You can use declaration-property-value-no-unknown to disallow unknown values for properties within declarations, and at-rule-descriptor-no-unknown to disallow unknown descriptors for at-rules.

此规则与以下内容重叠：

¥This rule overlaps with:

• color-no-invalid-hex

• function-linear-gradient-no-nonstandard-direction

• function-no-unknown

• string-no-newline

• unit-no-unknown

你可以关闭规则或将其配置为忽略重叠。

¥You can either turn off the rules or configure them to ignore the overlaps.

现有技术：

¥Prior art:

• stylelint-csstree-validator

选项

¥Options

true

以下模式被视为问题：

¥The following patterns are considered problems:

@counter-style foo {
  system: unknown;
}

@property --foo {
  syntax: unknown;
}

以下模式不被视为问题：

¥The following patterns are not considered problems:

@counter-style foo {
  system: numeric;
}

@property --foo {
  syntax: "<color>";
}