040 Markdown Notepad

1 test · 1 finished runs (0 agent, 1 raw one-shot) · 1 live demo

The prompt

Markdown Notepad: A split-pane notes app: type Markdown on the left and see a live rendered preview on the right, with a hand-written parser supporting headings, bold, italics, lists, links, code blocks and quotes. Notes autosave to localStorage, with a word count and a dark mode toggle. Build it as ONE self-contained HTML file: inline CSS and JavaScript only, no libraries or frameworks, and no external requests of any kind (no CDNs, web fonts, images or audio files); anything visual or audible is made in code (HTML/CSS, SVG, Canvas, WebGL or WebAudio). It must work when opened directly from disk, fit the browser window responsively, and run without console errors. Output ONLY the complete HTML file, starting with <!DOCTYPE html> and ending with </html>, with no explanation or markdown fences.