Is frontmatter part of standard Markdown?

No. It is a common convention used by static-site generators and CMS tools, but it is not part of the original Markdown syntax.

Should I keep frontmatter when exporting to PDF?

Usually no. Remove it or convert important fields into visible document text such as title, author, and updated date.

Because the renderer treated it as ordinary Markdown instead of metadata. Delete the frontmatter block before exporting if it should not be visible.

Yes. YAML supports arrays, usually written as indented dash items under a field such as tags.

Learn what Markdown frontmatter is, where YAML metadata is used, and what to do with it before exporting Markdown to PDF or Word.

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