Is it the last `script` element the currently running script?

Question

Is it safe to assume that the last script element* in the document when the script runs** is the currently running script?

For example, I want to create

Answer 1

It's not an absolute guarantee no. Check out this JSFiddle: http://jsfiddle.net/jAsek/

    
At the start
    
    
After the first script
    
    
At the end

Here the alert reports the id of the injected script "early", not the id of currently running script "second".

There's no practical difference between internal and external scripts.