The page itself is public HTML and holds no data — the board arrives only after the login on sheehangillis.com/my-account/ hands this tab a short-lived ticket. Without one, the API answers 401 and this is all there is to see.
One render path, three origins. All three end up as the same 1:1 image behind one <img>.
Deterministic, ~1.5 KB, drawn locally as SVG. Nothing is uploaded and no third party is in the path.
Resized to 512 px in this browser before anything leaves the device. No image service, no transform bill, no second copy of the original.
Type what you want and DeepSeek returns SVG source, which is validated and then rendered only inside an <img> (an SVG in an image element cannot run script).