/**
 * Check if the browser supports CSS Anchor Positioning.
 * @public
 */
export declare const AnchorPositioningCSSSupported: boolean;
/**
 * Check if the browser supports HTML Anchor Positioning.
 * @public
 */
export declare const AnchorPositioningHTMLSupported: boolean;
/**
 * Check if the browser supports Custom States.
 * @public
 */
export declare const CustomStatesSetSupported: boolean;
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