/*********
 * Quote unquoted HTML attribute values so the result is XML-friendly.
 *
 * HTML permits unquoted attribute values (including empty values like `data-x=`),
 * but XML requires attribute values to be quoted.
 *
 * This function scans the input and rewrites only *start tags* (`<tag ...>`):
 * - End tags (`</...>`), comments (`<!--...-->`), doctypes (`<!...>`), and
 *   processing instructions (`<?...?>`) are passed through unchanged.
 * - Quoted attribute values (`name="..."` / `name='...'`) are preserved verbatim.
 * - Unquoted values (`name=value`) become `name="value"`.
 * - Dangling assignment forms (`name=` followed by `>`, `/>`, or end-of-tag)
 *   throw instead of being normalized into boolean or empty attributes.
 * - Boolean attributes with no `=` (e.g. `disabled`) are left as-is (they are
 *   handled separately by flag/boolean expansion if desired).
 *
 * Design notes:
 * - Single-pass, quote-aware walk (no regex): safer around embedded `>` in quotes,
 *   mixed quoting, and unusual whitespace.
 * - Does not entity-escape `&`, `<`, or `>` inside values; keep this function’s
 *   job narrowly “add quotes”. Perform escaping in a later dedicated pass.
 *
 * @param src - Raw HTML-ish markup.
 * @returns The same markup, but with all unquoted attribute values quoted.
 *********/
export declare function quote_unquoted_attrs(src: string): string;
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