When you type a URL, such as www.example.com, into your browser, what actually happens? First, the browser would send a request to one of Example Corp's servers, which retrieves the resource requested (for example, an HTML file), and sends it back to the client:
The browser then parses the HTML, retrieves all the files the web page depends on, such as CSS, JavaScript, and media files, and renders it onto the page.
The browser consumes flat, one-dimensional texts (HTML, CSS) and parses them into tree-like structures ...
