I understand a website, with all its HTML, CSS files, JS programs and media files as an offer of the author, a hint how to display it. It is completely up to th

I understand a website, with all its HTML, CSS files, JS programs and media files as an offer of the author, a hint how to display it. It is completely up to the user to use a common widespread browser to follow all these rules, use a braille terminal or elinks, or use a heavily customized Firefox which doesn't even execute JavaScript. If you want to enforce a way of rendering, don't use the web. Force your user to use your specific App. And even that can be betrayed. OS level adblocking. So you better force them use locked down hardware and software which cannot be altered...