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I made a Doom source port that runs within a PDF file. PDFs support Javascript, so Emscripten is used to compile Doom to asm.js, which is then run within the PDF engine. Input/output is done by manipulating text input fields. doompdf.pages.dev/doom.pdf github.com/ading2210/do...

"PDFs support javascript" is the kind of sentence that makes me want to throw all my tech in a well and go and live in a cave.

It's also not the only scripting language embedded in PDF. PostScript is a full programming language. FormCalc is less powerful, but still there.

I'm aware of postscript, but that at least is relevant to the job of document rendering*, and full is doing some heavy lifting in "full programming language". Also, you know, javascript in general.

*yes, I know html is for documents, but the web is not really a series of linked documents anymore