| | Parse options for editor documents. The editor round-trips user content, so the parser must PRESERVE user / data-* attributes in the DOM rather than dropping them - editor features read them back via getAttribute (e.g. IsLocked reads data-donner-locked), and a save must not silently lose the user's own attributes. This matches the library default; the explicit assignment below pins the requirement so a future default change cannot silently break authoring. Every editor-side parse (document load, structural replace, clipboard validation) uses this.
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