Hello Readers! 👋
We use browsers like Chrome, Firefox, Safari, and Edge every single day.
But have you ever stopped to wonder:
How do these browsers actually “read” HTML and turn it into the websites we see?
Let’s talk about it — in the simplest way possible.
💡 Did You Know?
🔸 The average web page takes 0.5 to 2 seconds to render after loading the HTML.
🔸 Google Chrome alone renders over 3.2 billion webpages per day!
🔸 Browsers have special engines (like Blink in Chrome and Gecko in Firefox) that process HTML, CSS, and JavaScript.
Yep — they use their own “mini app” to understand your code. Pretty cool, right?
🧩 Let’s Break It Down
1️⃣ Step One: The Request
When you visit a website, your browser first sends a request to the server asking for the page’s HTML file.
The server replies in a few milliseconds. Lightning fast!
2️⃣ Step Two: Reading the HTML
Once received, the browser reads the HTML line by line and builds a structure called the DOM (Document Object Model).
Think of this as a tree-like map of all the elements — headings, paragraphs, images, buttons, etc.
🧠 A typical DOM tree can have hundreds or even thousands of nodes depending on how big your page is.
3️⃣ Step Three: Styling with CSS
Next, the browser applies the CSS (styling rules).
🔹 Most websites use around 50+ CSS rules and at least 5 external stylesheets.
🔹 This helps the browser build a Render Tree — which is a mix of structure (HTML) and design (CSS).
That’s what makes your page look nice — with colors, fonts, layouts, and spacing.
4️⃣ Step Four: Running JavaScript
If your site uses <script> tags, the browser now runs your JavaScript.
➡️ JavaScript can:
- Add interactivity
- Change the DOM on the fly
- Handle things like form validation or menu animations
📦 Note: If your JS file is large (average size is ~450KB), it can delay the final display.
5️⃣ Final Step: Painting on the Screen
Once everything’s ready, the browser turns all this into pixels and shows it on your screen.
✅ Most browsers repaint the screen 60 times per second for smooth visuals.
⚠️ But large images, animations, or messy code can slow this down!
⏱️ So, How Fast is All This?
- A basic HTML page can render in under 500 milliseconds
- With styles and scripts, a well-optimized page can load in 1 to 2 seconds
Fast, right?
🧠 Why Should Beginners Care?
Understanding this helps you:
✅ Write clean, fast-loading HTML
✅ Avoid code that slows down your site
✅ Debug layout or display issues easily
✅ Build websites that work well for everyone
💬 Final Words from Kriti
I know today’s blog was a little technical (okay, maybe a lot 😅),
But trust me — this knowledge is important.
It’s not just about writing code, it’s about understanding how that code becomes real — how your <h1> becomes a headline people see.
So thanks for sticking around 💛
And stay tuned — I post daily blogs right here on Code With Kriti.
Let’s keep growing — one line at a time. 💻🌱
CodeWithKriti 
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