/*********
 * Escape literal angle brackets inside quoted attribute values only.
 *
 * This performs a single-pass state-machine scan over the source string and
 * replaces `<` → `&lt;` and `>` → `&gt;` *only* when the parser is inside a
 * quoted attribute value (`"..."` or `'...'`) within a tag.
 *
 * Everything else is left untouched:
 * - Text nodes are not escaped.
 * - Tag structure (`<tag ...>`) is preserved verbatim.
 * - Unquoted attribute values are not modified.
 *
 * This is intentionally not regex-based:
 * - Regex splitting fails in the presence of nested quotes or malformed attrs.
 * - A small explicit state machine is more predictable and debuggable here.
 *
 * States tracked:
 * - Text: outside of any tag
 * - Tag: inside `< ... >` but not inside a quoted value
 * - EqWait: just saw `=` and are waiting to see if a quoted value begins
 * - QuotedD / QuotedS: inside `"..."` or `'...'` attribute values
 *
 * Use case:
 * - Prevent accidental tag breaks when attribute values contain `<` or `>`
 *   that should be treated as literal text, not markup.
 *
 * @param src - Raw markup string.
 * @returns Markup with angle brackets escaped *only* inside quoted attributes.
 *********/
export declare function esc_attrs_quoted_angles(src: string): string;
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