MDX and MDC
Result: native MDX; MDC is not supported. Docusaurus documents are compiled as MDX by default, so they can import and render React components next to Markdown.
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The counter above is a project component with React state. Its surrounding heading and paragraph are prerendered, while the buttons become interactive after hydration.
Nuxt Content's MDC component syntax is a separate format and is not parsed by Docusaurus. A portable content policy should therefore avoid treating MDX and MDC as interchangeable.