/**
 * What a Look condition matches on and what a Look block targets: the media
 * subjects, the element states spelled `@hook`, and the visual targets spelled
 * `@target`.
 */
export declare const LOOK_MEDIA_LENGTH_UNITS: Set<string>;
/**
 * The closed set of media-condition subjects a Look condition may name. Every
 * subject lowers to a CSS media query, so the whole set stays live for the
 * lifetime of the page. The names are reserved bindings in a Web module: a
 * user binding of the same name would otherwise be shadowed by this table
 * inside Look conditions only (LOK-D4).
 */
export declare const LOOK_MEDIA_SUBJECTS: ReadonlyMap<string, ReadonlySet<string>>;
/** Media features a Web developer may reach for that Look deliberately omits. */
export declare const LOOK_ABSENT_MEDIA_SUBJECTS: Set<string>;
export declare const LOOK_HOOKS: Set<string>;
export declare const LOOK_TARGETS: Set<string>;
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