Ionic avoid postback onclick

Hi
I have 2 buttons (A+,A-) in a page(project is Ionic3) to change font size in a ion-scroll … my problem is any click push a new line to navigation stack, in other word how can I avoid page postback when user is clicking this 2 font resize buttons !?

I have no idea what “push a new line to navigation stack” or “page postback” means, but if you have buttons in a form, and they are not declared as type “button”, they will be treated as submit buttons and submit the form.

thanks rapropos your solution solved the problem

to make it clear for other people who may refer this page

it means without type=“button” per each zoom in/out clicks user should press Android back button to return to previous page !