Pixel-art wizard spell (Canvas 2D)

Technique

Constrain to one self-contained HTML file, vanilla JS + Canvas 2D, no network assets—forces a complete frame-animation loop the agent can screen-record.

Short quote

Create a single self-contained HTML file that renders an animated pixel art wizard casting a spell, using vanilla JavaScript and Canvas 2D. No external assets, libraries, or network requests.

Quote truncated for fair use; see the original post for the full prompt.