Just to give more context on a sample issue I am currently struggling. It is actually JS issue but cant debug it –

I wrote this simple math practice tool for my kid to learn math tables.

obviously it had to be responsive so I picked a template that worked pretty well for styling part. But my JS seems to not work on iPad

it works on safari with ipad user agent.

http://math.imustread.com/multiplication/practice.html

this is open source on github here
https://github.com/fromdev/math/blob/master/multiplication/practice.html