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Fail-closed compatibility
Unsupported syntax returns typed diagnostics instead of silently producing a different diagram.
Mermaid-compatible parsing, deterministic layout, and native rendering without a WebView or JavaScript runtime.
Mermaid Native is an independent, non-official implementation. Compatibility is declared per diagram family and syntax feature; the support matrix is the source of truth.
Scope is explicit
A family marked implemented means only the declared syntax slice is covered. It does not claim full Mermaid parity.