/**
 * Paste normalizer — cleans HTML from Word, Google Docs, and arbitrary web pages
 * into RayEditor-compatible markup before insertion.
 *
 * Pipeline (in order):
 *  1. DOMParser sandbox — scripts never run
 *  2. Strip dangerous tags
 *  3. Remove Word/MSO namespace elements (o:p, w:*, v:*, xml)
 *  4. Unwrap Google Docs outer wrapper <b id="docs-internal-guid-...">
 *  5. Normalize tags (b→strong, i→em, strike→s, font→span)
 *  6. Filter attributes — strip class/id, keep only safe inline style props
 *  7. Semantic promotion — span[style] → strong/em/u/s/mark
 *  8. Unwrap empty/no-attr spans
 *  9. Returns clean HTML string (structure like pre→code-block handled by ContentManager)
 */
/**
 * Normalizes pasted or externally-sourced HTML.
 * Returns a clean HTML string ready for insertion into the editor.
 * RayEditor-specific structure (code blocks, table wrappers, task lists) is
 * applied separately by ContentManager.applyStructure().
 */
export declare function normalizePastedHTML(html: string): string;
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