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Adding auto-generated cover images to EPUBs downloaded from AO3

I built a handy tool to generate cover images for stories downloaded from AO3, making them easier to browse. Along the way, I learnt about how EPUBs work, the power of static sites, and some gotchas of async JavaScript.

TIL: Getting and setting the cover image from an EPUB file

TIL: How to find the content.opf in an EPUB file