export declare const DOCUMENT_KERNING_THRESHOLD_ATTRIBUTE = "data-office-kerning-threshold-half-points";
export declare const DOCUMENT_KERNING_THRESHOLD_MIN_HALF_POINTS = 0;
export declare const DOCUMENT_KERNING_THRESHOLD_MAX_HALF_POINTS = 3277;
export declare const DOCUMENT_KERNING_DEFAULT_THRESHOLD_HALF_POINTS = 24;
export declare function normalizeDocumentKerningThresholdHalfPoints(value: unknown): number | null;
export declare function documentKerningThresholdPoints(value: unknown): number | null;
export declare function documentKerningIsEffective(thresholdValue: unknown, fontSizeValue: unknown): boolean;
export declare function documentKerningDomAttributes(thresholdValue: unknown, fontSizeValue?: unknown): Record<string, string>;
export declare function documentKerningThresholdHalfPointsFromElement(element: HTMLElement): number | null;
export declare function documentKerningFontSizePoints(value: unknown): number;