Unclear mousedown event behavior

Unclear mousedown event behavior

Hi,

I'm new to jQuery, so I apologise if this sounds silly.
I'm referring to the the mousedown API documentation: https://api.jquery.com/mousedown/
Using the example at the bottom of the page, I was expecting the mousedown event to get fired as soon as the mouse is pressed. Instead, when using my finger on my chrome mobile browser, both mousedown AND mouseup events get fired together when I lift the finger off the element.

Why is that?

Thanks in advance,
Nir