Obviously there would need some additional thought put into this. It might be a net-positive for every YouTube embedded video to have an address bar (copy from

Obviously there would need some additional thought put into this. It might be a net-positive for every YouTube embedded video to have an address bar (copy from the iframe url and paste the embed URL into the browser's address bar, YouTube could detect that it's not being loaded into a frame and take the user to the standard video page). As far as the 1x1 and minimum frame size, I don't know. 1x1 iframes are usually hidden (is there any point to having them visible?). I don't think it's a specification's place to enforce minimum size limits for elements (frames or otherwise). Perhaps the user agent could display a button that the user could interact with if the iframe size were smaller than a certain size.