offline-office-editor

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@user_538e39fa/offline-office-editor

Reusable patterns for building and maintaining a single-file, fully offline Office editor (Excel/Word/PowerPoint) in plain JavaScript with no server. Use this skill when adding or fixing features in the C:/office project, or any task that needs to generate or edit .xlsx/.docx/.pptx files offline - especially conditional formatting, formulas, comments, data validation, charts, hyperlinks, freeze panes, or row/column structure - via a hand-rolled OOXML inject and read post-processing layer on top of SheetJS, backed by a jsdom regression-test harness.