

Unless the lovely javascript detects that you’re trying to close the tab and hijacks that to ask you if you are sure you want to forcefully tell them to fuck off and die leave the page. It’s only one extra click, sure, but I remember some from the old days that wouldn’t let you close shit. Ugh, thank god for better modern standards and adblockers.
A constitutional requirement for what? Answer that and you’ll understand why it doesn’t matter if they’re in “clear violation.”