In Safari and Chrome browsers (I did not check others) on iPhpone 5 when installing a font-size
in a css-file:
* { font-size : 48px; }
all form elements are scaled except input-file.
On IE, Chrome and FireFox on the PC, everything works out on a regular basis and on the iPhone 6 - also on a regular basis.
On the other did not try.
Is this feature specifically iPhone 5?