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Supported file types
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- Markdown (.md, .markdown) — GitHub-flavored parsing (tables, strikethrough, task lists,
--- rules, etc.); HTML is sanitized after conversion.
- HTML (.html, .htm) — source shown escaped by default; optional Render viewable page uses DOMPurify with a tight tag/attribute allowlist (no extras).
- Plain text / code (.txt, .css, .js, .json, .xml, .yml, .yaml, .ini, .sql, .log, .conf, .config, .php, …) — monospace preview.