What happens when you type the URL into the browser to display the page?

Simple version:

1. URL parsing: First check whether the entered URL is valid.
2. DNS domain resolution: Find the IP address corresponding to the domain name.
3. TCP connection: three-way handshake.
4. The server processes the request.
5. Browser receives response: The browser parses the received server resources.
6. Render pages: HTML parses into DOM trees, CSS parses into CSS rule trees, and merges into render trees.
7. JavaScript compiler executes.
8. TCP waved four times.