/*******
 * Normalize whitespace inside an attribute value.
 *
 * Behavior:
 * - Replaces newlines, carriage returns, and tabs with spaces.
 * - Collapses multiple consecutive spaces into a single space.
 * - Trims leading and trailing whitespace.
 *
 * Intended use:
 * - Canonicalize attribute values for comparison, serialization,
 *   or downstream processing.
 *
 * Notes:
 * - This should NOT be applied to the `style` attribute, whose
 *   internal spacing may be semantically meaningful.
 *
 * @param s - Raw attribute value string.
 * @returns A whitespace-normalized string.
 *******/
export declare function normalize_attr_ws(s: string): string;
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