Javascript in HTML:

$1$a$.$ What event must occur before the script gets executed if we add the defer attribute?

$1$b$.$ Draw a diagram showing the events in the browser when loading a script with defer $($can be just text$-$based like load page $------>$ domContentLoaded $------>$ etc.

$1$c$.$ Draw a diagram showing the events in the browser when loading a script without defer.