Libscore scans the top million sites…

Libscore scans the top million sites on the web to collect stats on JavaScript library usage. It has been around for a while, and this article goes into more how it works.

You can dig into individual scripts, like for this one from s0.wp.com (the most popular WordPress-only script), which is used on ~45,000 of the top million sites — a bit lower than I'd expect.

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