Where can I see the implementation of built-in methods in JS?
Teach JS, had a job to do was polyfil for the matches method. Started probyvat, but parity did not work, did not understand how it is implemented in the embedded method. And polyfil is to write needed by simply calling the methods from inside the old prefixes.
In General, interested in the implementation of the matches method. Where and how to view the code of this method?
Examine the source code of WebKit. Somewhere there is a hidden render. But I am more than sure that you were not a Fig do not understand. There's a bunch of c++ libraries which render rendit js (heads or tails ).
Another option is to look the source virtual machine node. (like B8)