Share the technical implementation of Markdown export and publish copy in CodeWF.Markdown and Vex: MarkdownDocumentExporter, ExportKind, shared image loading, SVG/GIF/WebP rasterization, Word embedded media resources, selectable text PDF, Windows CF_HTML rich HTML clipboard, and extensible typography themes.
根据文件扩展名查询 MIME 类型，或根据 MIME 类型反查常见扩展名。