It would'be been so easy to just answer the question I asked. Instead, it's now a thread of non-answers and thinly veiled ad-hominem attacks.
The rest of your long answer is once again working hard on avoiding the answer.
> I find it hard to believe that you think there aren't any.
I didn't say there weren't any. I asked, "which ones let you test the problem in OP".
> I see our testers doing this all the time - but I don't know what libraries they use
Ah, my assumption that you don't know what you're talking about is proven correct.
> On our company's security team, various people have scripted UI exploits using selenium or appium
Question: scrollbars.
"Answers": tools click on buttons, scripting security exploits, I don't know what libraries testers are using.
Ignorance is bliss, isn't it?
> and she said it would take her a few minutes.
Given your answers in this thread, I seriously doubt your ability to ask a proper question to "the people familiar with the tools". Especially given the fact that you don't know what libraries testers use and that you, apparently, don't do any testing yourself.
See, frontend testing is very far from being "a solved problem". Especially for quirks as described in OP. But you wouldn't know because you, well, don't know.
> These are commodity tools. There is nothing special with any of them.
Indeed they are. Indeed there is nothing special. And this still doesn't answer the question.