Would Not Wish This Hell On Anyone

Someone tried to parse .docx files and discovered the Lovecraftian horror that is Microsoft's document format. Turns out "zipped XML" is like saying the ocean is "just water"—technically true but catastrophically misleading.

The ECMA-376 spec is over 5,000 pages and still doesn't document everything Word actually does. Tables nested 15+ levels deep? Valid XML that crashes Word? Font substitution based on whatever's installed on your machine? It's like Microsoft asked "what if we made a format that's impossible to implement correctly?" and then spent 40 years committing to the bit.

The solution? Scrape 100k+ real .docx files from Common Crawl to find all the cursed edge cases that exist in the wild. Because when the spec lies to you, the only truth is in production data. They even open-sourced the scraper, which is either incredibly generous or a cry for help.

Fun fact: The .docx format has a "Compatibility Mode" that changes behavior based on which Word version created the file. Because nothing says "open standard" like version-specific rendering quirks baked into the format itself.