gemtext (the native presentation format for gemini capsules) is a markdown-like language which only uses the first three characters of each line to determine the presentation mode for that line. it's designed so that it's trivial to create a renderer, even on retro 8-bit computers (determine presentation mode, set up the font, then just dump the buffer until you hit a newline). it supports paragraphs, headings (3 levels), links (not inline with text, must be on its own line), lists (unordered), blockquotes, and preformatted text. there is zero inline formatting (not even a way to emphasize words in a paragraph).

https://gemini.flounder.online/docs/gemtext.gmi