MD vs XHTML
Um comparativo detalhado de Markdown e XHTML Document — tamanho de arquivo, qualidade, compatibilidade e qual escolher de acordo com seu fluxo de trabalho.
Markdown
Documents & TextMarkdown is a lightweight markup language that uses plain text formatting syntax. It is widely used in software development, technical documentation, and content management systems.
Sobre os arquivos MDXHTML Document
Documents & TextXHTML is XML-compliant HTML for strict document processing.
Sobre os arquivos XHTMLComparativo de vantagens
MD Vantagens
- Readable as plain text even before rendering — fits in version control beautifully.
- Dead-simple: 90% of needs covered in 10 minutes of learning.
- Converts trivially to HTML, PDF, EPUB, and DOCX via Pandoc.
- Every modern IDE, note-taking app, and developer tool renders it natively.
- Lightweight — a typical Markdown file is kilobytes, not megabytes.
XHTML Vantagens
- Rigorous XML syntax — can be parsed with any XML tool.
- Native EPUB and DocBook support.
- Enforces clean markup — no sloppy error recovery.
- Namespaces allow mixing SVG, MathML, and XHTML in one document.
Limitações
MD Limitações
- No formal authoritative spec — CommonMark, GFM, and MultiMarkdown differ on edge cases.
- Tables and complex layouts are clunky; footnotes and math require extensions.
- Links to images stay external — no embedded media unless you base64-inline.
- Styling is limited to what HTML allows — custom branding requires CSS outside Markdown.
XHTML Limitações
- Browsers reject XHTML with strict MIME on any markup error — harsh failure mode.
- Authoring is more tedious than HTML5.
- Not served by ~99% of the web.
- Largely superseded by HTML5.
Especificações técnicas
| Especificação | MD | XHTML |
|---|---|---|
| MIME type | text/markdown | — |
| Extensions | .md, .markdown, .mdown, .mkd | .xhtml, .xht, .xml |
| Standard | CommonMark, GitHub Flavored Markdown (GFM) | — |
| Encoding | UTF-8 (conventional) | UTF-8 (required with XML prolog) |
| Companion spec | RFC 7763 (2016) | — |
| MIME types | — | application/xhtml+xml, text/html |
| Standards | — | XHTML 1.0 (2000), XHTML 1.1 (2001) |
| Used in | — | EPUB, DocBook, some government sites |
Tamanhos típicos de arquivo
MD
- README 1-15 KB
- Blog post 2-30 KB
- Full technical manual 50 KB - 2 MB
XHTML
- EPUB chapter 5-50 KB
- DocBook reference page 10-100 KB
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Perguntas frequentes
Markdown is a lightweight text-based markup language created by John Gruber e Aaron Swartz in 2004. A .md arquivo uses simples conventions (*italic*, **bold**, # headings, - lists) that compile to HTML. It became the default writing formato para GitHub READMEs, Stack Overflow posts, Discord messages, e most developer documentation.
Markdown arquivos são plain text — abrir in any text editor. para formatoted preview usar VS Code (built-in preview), Typora, Obsidian, ou enviar to GitHub/GitLab which render Markdown automatically. Every note-taking app (Notion, Bear, Joplin) handles Markdown natively.
Use KaijuConverter's Markdown-to-PDF converter, ou command-line Pandoc (the gold padrão — installed com one command, converts MD to PDF/HTML/DOCX/EPUB em um single line). VS Code com Markdown PDF extension also funciona locally.
Markdown para almost everything — it's 10× faster to write, version-control-friendly, e compiles to HTML automatically. Write raw HTML only when you need fine control over layout, embedded JavaScript, ou features Markdown doesn't support (complex tables, forms). Static-site generators (Hugo, Astro, Jekyll) compile MD to HTML para you.
Markdown never had a formal spec para its first decade. CommonMark (2014) e GitHub Flavored Markdown (2017) padrãoized the core syntax, mas edge cases (nested lists, HTML embedding, table syntax) still differ across renderers. para portability, stick to basic GFM features.
Yes — most moderno doc ferramentas are built on Markdown. MkDocs, Docusaurus, Astro Starlight, GitBook, e Read the Docs all accept Markdown input. para documentation needing rich features (tabs, callouts, versioning), MDX (Markdown + JSX components) extends MD com React-style embeds.