Safari for iOS is probably a less obscure example - as you scroll down the page, the address bar will scroll off screen. These interactions are expected by the

Safari for iOS is probably a less obscure example - as you scroll down the page, the address bar will scroll off screen. These interactions are expected by their users, and they know how to navigate around them. I wouldn't be hasty and say i don't think it'd be a material concern, on the contrary, it could make for some interesting A/B testing!