How big is the API surface of the web - HTML, JS, CSS, APIs… ???

8173 
According to MDN engineer @floscholz, who counted up the @MozDevNet compatibility data (which is 76% complete at this time).https://hacks.mozilla.org/2018/03/hack-on-mdn-building-useful-tools-with-browser-compatibility-data/ …
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8173 what? This is "APIs", methods, or some other count?
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Well, features that we record in https://github.com/mdn/browser-compat-data … CSS properties, HTTP headers, HTML/SVG elements and their attributes, API interfaces and their members. Also webextension APIs are part of that repo, so the number isn't just about the Web. I could get better numbers, tho
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Yeah, all of the above… minus the 24% of MDN not yet migrated, and the WebExtension APIs.
The object graph work by @MrMarkDittmer is likely a better count for purposes of “all APIs in use in browsers”. See his response earlier in the thread.
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