Speaking of Safari having good UX around undoing state changes that I miss in other browsers: why can a website put a navigation in another tab, but I can’t pre

Speaking of Safari having good UX around undoing state changes that I miss in other browsers: why can a website put a navigation in another tab, but I can’t press back to get out of it in any other browser? (Safari’s implementation isn’t perfect and I can think of ways to improve it, but a simple “yep I didn’t want to go here” should be just as effective if the website specifies `target` as when it doesn’t.)