How to get native javascript functions source code?

by
  1. Pick a browser
  2. Make sure it is an open source one
  3. Dig through its source code

Some repositories include:

Note that JavaScript native functions are generally not written in JavaScript (expect C or C++ most of the time). They are just exposed to JS through an API.

Also note that the code that scrolls a page when the spacebar is pressed isn’t even a function that is exposed to JS.

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