- https://daily-dev-tips.com/posts/what-exactly-is-frontmatter/
- https://dpericich.medium.com/what-is-front-matter-and-how-is-it-used-to-create-dynamic-webpages-9d8dc053b457
- https://jekyllrb.com/docs/front-matter/
- https://pandoc.org/MANUAL.html#extension-yaml_metadata_block
- https://gohugo.io/content-management/front-matter/
- https://mystmd.org/guide/frontmatter
- https://assemble.io/docs/YAML-front-matter.html
- https://mdxjs.com/guides/frontmatter/
- https://docs.github.com/en/contributing/writing-for-github-docs/using-yaml-frontmatter
- https://content.nuxt.com/usage/markdown#front-matter
- https://docs.zettlr.com/en/core/yaml-frontmatter/
- https://marpit.marp.app/directives?id=front-matter
- https://commonmark.thephpleague.com/2.4/extensions/front-matter/
- https://jsr.io/@std/front-matter
- https://github.com/remarkjs/remark-frontmatter
- https://www.npmjs.com/package/gray-matter
- https://github.com/jekyll/jekyll/commit/ecda27488c7c896df0da0470b12370e7d9e05ae9
- https://github.com/jekyll/jekyll/commit/5c46fd6206e7232551596922b41e5dfab46b40c8
- https://github.com/middleman/middleman/commit/5ded17c775cbf6f06a381deb4af7d5f3267d18d1
- jnordberg/wintersmith#36 (comment)
- jgm/pandoc#419
- jgm/pandoc#851