User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-5064943-20150515210708/@comment-11515627-20150516183454

You could definitely do this with Javascript (using a popup that blocks the page until some confirmation button is pressed), but you should know, coming from a web developer, this is largely considered pointless practice. First of all, there really is nothing you can do to legitimately protect your content as there are always loopholes and ways around it, and secondly, parents don't really have any jurisdiction on the web seeing as how there are no legality issues concerning it. Kids will view whatever they want on the internet, period. As long as their parents allow access to the internet, they're going to do what they're going to do and there's nothing anyone can really do about it. I wouldn't concern myself with this issue, really.