how to autoclick this `button`?

<button data-ratparam="all" data-ratid="fixed_checkout" data-ratevent="pv,appear" class="cart-button checkout new-cart-button"><span class="normal"></span></button>

here is the element I cut from chrome I am new to web dev and I wonder if this is a button at all ?

I wanna auto click this button and used event visual but nothing appeared on the web . Don't know what to do .

many thanks