Implications of multiple [removed] tags in HTML

Question

I have read that it is not recommended to instantiate jQuery multiple times in your HTML. This makes perfect sense to me, but: Isn\'t Javascript single-threaded anyway? And

Answer 1

Simple answer:

In a simple scenario (tags are part of original HTML text), the browser definitely executes them one after another.

Detailed discussion with different caveats

JavaScript isn't necessarily single-threaded (it depends on the implementation of your JavaScript engine, e.g. see Web Workers).

BUT, the individual