Web Browser

A web browser is the program a person uses to visit your site, such as Chrome, Safari, Firefox, or Edge. It requests pages, then interprets the HTML, CSS, and JavaScript it receives and turns them into the page you experience.

Different browsers do not always render things identically, which is why testing across them matters. Behind the scenes, the browser builds the document object model (DOM) from your markup and runs whatever code the page provides. Every visitor views your site through whichever browser they happen to use.