People read content on a mobile completely differently from the way they read on a desktop. Eye-tracking studies measure where the eye is looking and how long it spends at each point on a screen.
The desktop ‘golden triangle’ – readers concentrate primarily on the top left corner of a page:
F-shaped (Nielsen, 2006) – the dominant reading pattern resembled the letter F.
There isn’t enough space on a mobile screen for horizontal sweeps and vertical movement. Instead, viewers focus their attention primarily on the centre and top half of the screen (Briggsby, 2014).