[Retr0id]

> You still need a tiny bootstrap loader to decode the image.

Nope, you can do it all in a single file with an html/png polyglot (and nowadays you can get better compression ratios with newer formats like webp).

https://web.archive.org/web/20120801001616/http://daeken.com...

[gildas]

You can even make the file compatible with ZIP (and PDF) on top of that, see https://github.com/gildas-lormeau/Polyglot-HTML-ZIP-PNG/raw/... (and https://github.com/gildas-lormeau/Polyglot-HTML-ZIP-PNG)