Harsh Sakhiya
You wrote your first line of JavaScript yesterday — but how does it actually work inside your browser?
Let’s uncover the magic behind the scenes! 🌟
🚀 What Happens When You Write JavaScript?
When you write JS like this:
console.log("Hello World");Here’s what your browser does:
1. It reads the HTML file.
2. When it finds a tag, it sends that JS code to the JavaScript Engine
3. The engine translates your human-written code into something the computer can understand.
4. It runs that code immediately and shows the result (like printing in the console).
🧠 Meet the JavaScript Engine
Every browser has a built-in engine:
Chrome → V8 Engine
Firefox → SpiderMonkey
Safari → JavaScriptCore
Edge → Chakra (legacy)
These engines are super powerful programs that convert and execute your JS.
🖼️ Where Can You Run JS?
1. In-browser console (DevTools → Console tab)
2. Inside <script> tags in HTML
3. Using separate .js files linked to your HTML
Example in HTML-:
<script>
alert("This is JavaScript running!");
</script>Or-:
<script src="script.js"></script>🔧 Quick Tip
🔍 Use alert("Hello!") and console.log("Testing"); to quickly check if your JS code is working.
🧪 Practice Challenge
Create a .html file and write:
<!DOCTYPE html>
<html>
<head><title>JS Test</title></head>
<body>
<h1>Check your console!</h1>
<script>
console.log("JavaScript is running inside the browser!");
</script>
</body>
</html>Open it in your browser and check the console tab.
👋 Sign-Off
Tomorrow, you’ll write your first real JavaScript program — clean and properly structured.
You're not just learning code — you're learning how the web thinks. 🙌
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