Deck

Write in Markdown and split slides on a line that is just `---`; the split is code-fence aware, so a `---` inside a code block stays in the slide instead of breaking it. An editor on one side, a live slide preview on the other, an outline to jump between slides, and speaker notes on a line beginning with `Notes:`.

Present mode fills the window and moves with the arrow keys; a print stylesheet lays one slide per page for a clean PDF. It autosaves to your browser as you type, and the Markdown is rendered through the same escaping the rest of the site uses, so pasted content cannot inject anything. No accounts, no upload.