Type Markdown on the left, see rendered HTML on the right - no upload, no editor lock-in.
The everyday text work of writing day: how many words, what changed between two drafts, what the markdown looks like before you paste it into the CMS. None of it leaves the page until you copy it out, which matters when the draft is not yet ready for anyone else to see.
Why does my footnote syntax show up as plain text?
Footnotes, definition lists and attributes are extensions rather than core Markdown, and each renderer supports a different subset. Check the flavour your publishing pipeline uses before you rely on one, and keep the fallback readable if the extension is stripped.
How do I know my draft will paste cleanly into the CMS?
Paste a short sample rather than the whole piece. The usual casualties are heading levels the CMS does not have, hard-wrapped lines that become awkward breaks, and raw HTML that the editor strips on save.
Can I trust the preview as the published result?
No. This renders with a browser-side parser while the CMS or static site generator uses its own, and they differ on tables, line breaks and typographic quotes. Treat the preview as a structural check, then verify on a staging page.