Tomasz Łakomy posted a joke tweet about naming all the CSS attributes and Tejas Kumar replied with a joke answer, going as far as making an npm module. You can even run a terminal command to see them:
npx get-all-css-propertiesYou'll get 259 of them. The source code uses the website quackit.com for the data, which I'd never heard of. 🤷♂️
I would have probably looked at MDN, where some quick querySelectorAll handiwork in the console yields a different number: 584. But ooops, that's full of selectors, at-rules, and other stuff. Their reference only lists 72, but says it's incomplete.
W3Schools lists 228 of them. HTML Dog lists 125. Our almanac has 176, and I know we omit stuff on purpose (e.g. we file margin-left under margin instead of making its own entry).
520 distinct property names from 66 technical reports and 66 editors' drafts.
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