Is it possible that they haven't figured out how to sandbox the little bit of code that handles the notification from the rest of the webpage? Maybe this is sol

Is it possible that they haven't figured out how to sandbox the little bit of code that handles the notification from the rest of the webpage? Maybe this is solved already by the webpush standard but some websites are a ridiculously overcomplicated hot mess of javascript ads which make my phone heat up, I don't want them waking up my phone all the time and draining the battery.