True, if you rewrite the code, then that would even work via a simple injection of _cover(123); after each line, where 123 is the line number. Could be a

True, if you rewrite the code, then that would even work via a simple injection of _cover(123); after each line, where 123 is the line number. Could be a fun project to write a bookmarklet that does this to the current page, then lets you use it and then tells you which parts of the code have not been used.