"Something simple" was a direct quote, but I think we are perhaps talking at cross purposes. I now believe (and correct me if I'm wrong) you mean that this is something seemingly so fundamental that it should exist as something anyone could call, without having to write the code you quickly put together to achieve this. Opposed to my reading that the task itself was simple. When I first encountered Mojo::DOM I recall just reading it from start to finish, and it really didn't take that long, and I don't consider myself a fast reader by any means. From time to time I find myself looking it up either to refresh my memory or to link to something for someone else.
Yes there are many methods, that's part of the power of this and I'd say I've taken advantage of most, if not all of them. Sure at first I accept, "this slows you down", but maintain that this shouldn't be seen as a negative thing. After my short pointer, and your 20 minutes you now have the code you need, a basic understanding of how Mojo::DOM works and what it can do, and are considering publishing something to make this easier on yourself and others in future. Seems like a win-win to me. Perhaps sounding out the Mojo team as to weather you could simply provide a PR with a new method for Mojo::DOM to provide your desired functionality would be welcomed.