Webpages are dumptrucks for every bad feature anyone ever thought up and are in a constant state of trying to re-framework their way out of the complete mess of utils that get shipped by default. Need a gadget that implements eye tracking via sidechannels? Yeah, they got that. And then justify that with "analytics" or anti-fraud and abuse, and no "click jacking" or whatever crap, and roll it times 1000.