The way how to recognize an element

In Selenium, How does it recognize an element?

What if the element is 10x10 and I want to click it?

Does it click in the middle of the element or …?

While I took a test, there is a case that an invisible element located over the other element, not whole part, but some part.

In this case, katalon cannot click the element under the invisible one.

I want to know how much should the element be on the visible part on the screen.

selenium clicks in the middle of element. more info in topic below -->