GitHub supports now a syntax to set blockquotes as note, tip, important, warning and caution, as we usually see in technical books. A way better description than mine is present here: [Markdown] An option to highlight a "Note" and "Warning" using blockquote (Beta) · community · Discussion #16925 · GitHub
Already built in: Callouts - Obsidian Help
Funny, you know, Obsidian’s built-in implementation probably played a role in influencing GitHub’s implementation
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