Good call! I guess i haven&#x27;t seen any of those. But i&#x27;ve seen some internal web based systems that relied too heavily on popup windows and started breaking when tabbed browsing became a thing and brosers started blocking popup windows by default, so i don&#x27;t doubt that there are probably systems out there relying on this weird behavior of target=_blank.<p>For those systems, though, i&#x27;d imagine most of them would have these popup windows on the same origin, right? So having browsers prevent child windows changing their parent&#x27;s location <i>if they are cross-origin</i> seems like a sensible idea, or am i missing something else?