Is there a way to do this on mobile? Probably not an easy one, but if mobile Safari had an extension, I'd install it immediately.

The worst is when you use the top edge of the screen to read, but the site has a navbar that only shows up when you scroll up. So if you scroll slowly upwards, the navbar creeps slowly downwards, and keeps hiding the text you're trying to read. Thankfully such design choices seem to be getting rarer.

Do sticky headers measurably increase conversion rates, or is it a fad? If there's data to support why people keep making this decision, I guess I could be persuaded to feel that it's not a case of "Everyone likes to do it their way, and you like your way."