Is there a way that WPT could be modified (or maybe a script feature) to search for a bit of text? A regular expression would be even better.
We’re using a private instance with APIs for some monitoring, and this is a key feature for knowing if the page is actually loading or just sending you to some other screen (like a login).
It’s been on my wish list to implement for a while but I haven’t gotten around to it yet. A regex against the HTML of the constructed DOM is what I was thinking to allow for exactly what you’re talking about.