export declare const keywords: (...values: readonly string[]) => ReadonlySet<string>;
/**
 * The five keywords every CSS property accepts. They are kept apart from a
 * property's own vocabulary so a diagnostic can lead with the values that
 * belong to the property being written (D67 rule 174).
 */
export declare const LOOK_CSS_WIDE_KEYWORDS: readonly string[];
export declare const cssWideKeywordSet: ReadonlySet<string>;
/** Shared sizing words accepted by metric properties without a property-specific table. */
export declare const LOOK_SHARED_METRIC_KEYWORDS: readonly string[];
/** Named colors accepted by the checked color and background value kinds. */
export declare const LOOK_COLOR_KEYWORDS: readonly string[];
/**
 * Every `left right` value of a grammar that takes one token from each of two
 * positions — `y mandatory`, `left top`. D65 rule 169: a closed set holds the
 * complete value the author writes, so a multi-token CSS value is written out
 * here rather than turned into a builder or a token grammar of its own.
 */
export declare function lookValuePairs(left: Iterable<string>, right: Iterable<string>): readonly string[];
/**
 * Every value of a CSS `||` combination: each non-empty selection of the tokens
 * in every order the combinator accepts, so `dense row` is the same value as
 * `row dense` to the author and to the browser.
 */
export declare function lookValueOrderings(tokens: readonly string[]): readonly string[];
/** Every value of a `[ … ]{1,2}` repetition — `scrollSnapAlign: start end`. */
export declare function lookValueRepetitions(tokens: readonly string[]): readonly string[];
export declare const positionKeywords: string[];
export declare const textDecorationLineKeywords: string[];
export declare const listStyleTypeKeywords: string[];
export declare const listStylePositionKeywords: string[];
export declare const colorSchemeOrderings: readonly string[];
export declare const scrollSnapAxes: string[];
export declare const overscrollBehaviors: string[];
export declare const alignBaselinePositions: string[];
export declare const alignSelfPositions: string[];
export declare const alignContentPositions: string[];
export declare const alignContentDistributions: string[];
export declare const touchActionKeywords: string[];
export declare const backgroundRepeatKeywords: string[];
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