How to get native javascript functions source code?

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

Some repositories include:

• Firefox
• Webkit
• Chromium

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.