Key Takeaways
- A website is a collection of files (HTML, CSS, JS, assets) hosted on a web server connected to the global internet.
- DNS acts as the phonebook of the internet, translating domain names into machine-readable IP addresses.
- Browsers parse HTML into a DOM tree, CSS into a CSSOM tree, and execute JavaScript to make the page interactive.
- Modern architectures leverage Edge CDNs and Serverless functions to deliver sub-second global responses.
1. The 4 Fundamental Pillars of Every Website
Every website in existence relies on four foundational components:
1. **The Client (Web Browser):** Chrome, Safari, or Firefox which requests and displays web pages to the user.
2. **The Server:** A specialized computer constantly connected to the internet that stores the website files and database.
3. **The Domain Name System (DNS):** Translates human-readable names (like `mordenwebs.com`) into server IP addresses (like `151.101.1.195`).
4. **The Network Protocols:** HTTP/HTTPS and TCP/IP which dictate how packets of data travel securely across cables and routers.
Essential Rules:
- Clients request data; servers process and return data.
- HTTPS ensures encryption via TLS/SSL certificates.
Architect Pro-TipAlways use HTTPS. Modern browsers flag unencrypted HTTP websites as "Not Secure", hurting conversion and SEO.
2. The Step-by-Step Lifecycle of a Web Page Request
When you type a URL into your browser address bar and press Enter, the following sequence occurs within 200–500 milliseconds:
1. **URL Parsing:** The browser breaks down the protocol (`https`), hostname (`www.mordenwebs.com`), and path (`/portfolio`).
2. **DNS Resolution:** The browser checks local cache, then queries Recursive DNS servers to find the server's IP address.
3. **TCP 3-Way Handshake:** The browser establishes a reliable connection with the server (SYN, SYN-ACK, ACK).
4. **TLS Negotiation:** Secure cryptographic keys are exchanged for end-to-end encryption.
5. **HTTP GET Request:** The browser asks the server for the HTML document.
6. **Server Processing:** The server compiles or retrieves the static HTML and sends back an HTTP `200 OK` response.
HTTP Request / Response
GET /portfolio HTTP/2
Host: www.mordenwebs.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
Accept: text/html,application/xhtml+xml
HTTP/2 200 OK
Content-Type: text/html; charset=UTF-8
Content-Encoding: br
Cache-Control: public, max-age=36003. How the Browser Renders the Page (DOM & CSSOM)
Once the raw HTML bytes arrive at the browser, the rendering engine converts code into pixels:
- **HTML Parsing -> DOM (Document Object Model):** The tags are parsed into a tree of nodes.
- **CSS Parsing -> CSSOM (CSS Object Model):** Styles are matched with elements.
- **Render Tree:** The DOM and CSSOM are combined, filtering out non-visible elements (like `display: none`).
- **Layout (Reflow):** The browser calculates exact geometry, positions, and dimensions on the screen.
- **Paint & Compositing:** Pixels are drawn and layered onto the GPU for display.
Architect Pro-TipAvoid heavy JavaScript execution during initial render to prevent blocking the Main Thread and delaying First Contentful Paint (FCP).
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Frequently Asked Questions
A web page is a single HTML document (like an About page), whereas a website is a collection of linked web pages under a shared domain name.
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