Canvas-generated receipt images in the browser: no server, no library

<p>I wanted visitors to be able to save a neat summary of their result as an image — the kind of thing you can share in a chat or keep for your records. The obvious way is a server endpoint that renders a PNG and sends it back. But my sites run on plain shared hosting with no build step and no image library, so I did it entirely in the browser with the canvas API. No server, no library, no extra d

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