Before anything can happen in a browser, it must first know where to go. There are multiple ways to get somewhere: entering a URL in the address bar, clicking (or tapping) on a link on a page or in another app, or clicking on a favorite. No matter the case, these all result in what’s called a navigation. A navigation is the very first step in any web interaction, as it kicks off a chain reaction of events that culminates in a web page being loaded.
…Once the browser engine finally gets the resource, it needs to start turning it into a rendered web page. In this segment, we focus primarily on HTML resources, and how the tags of HTML are transformed into the building blocks for what will eventually be presented on screen.