How browser displays a static website contents without any confusion, when two requests are fired from a browser in different tabs

I'm a web developer, I just want to know how things work behind the scenes when a request is fired.

Suppose let's assume I've a static website, I requested about us page in one tab, contact us in other tab, both the requests are fired at the same time..

when the requests are fired at the same time, How browser displays the content in respective tabs correctly ?

Thanks in advance..