Creating and highlighting code blocks - GitHub Docs
https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks
We use Linguist to perform language detection and to select third-party grammars for syntax highlighting. ... Creating diagrams. You can also use code blocks to create diagrams in Markdown. GitHub supports Mermaid, geoJSON, topoJSON, and ASCII STL syntax. For more information, see "Creating diagrams." Further reading. GitHub Flavored Markdown Spec
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