I just added this as a feature. You can launch the game with custom WADs at the site's landing page (https://doompdf.pages.dev/). It'll open a new PDF file as a blob URL (and you can even save and redistribute the PDF it generates).

A disclaimer though - I don't have any experience with Doom modding. I don't know if the behavior of this feature is correct. All it does is it loads the PWAD by passing the "-file" argument to the game's main function.

Cool. This is a great project!

I've been playing around with the version that was up yesterday. I managed to get my DOOM Resume running in the PDF https://github.com/adamrmelnyk/thisResumeRunsDoom.

Is it playable.... eh? that's another matter. I think I'd need to modify it a bunch. Right now the doors don't seem to open when playing the PDF. I could just remove them all though.