Are these Proofreader's marks also used in plays/scripts? To rephrase the question, are there certain proofreading marks playwrights use to edit plays? I've been googling it in the net, but to no avail.
editing is just editing, no matter what the writing medium is... you're still just working with words and how they're used, so there's no need for any difference in proofreader's marks...