Script Tag Async Vs Defer Attribute in Bangla | Programming With Noor

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In today's video, we’ll discuss two important attributes of the script tag — async and defer.
Understanding them will help you make your websites faster and more efficient!

👉 If you’re learning HTML, JavaScript, or web performance optimization, this is a must-watch.

🔧 What You'll Learn:

- How Browser receives HTML file?
- HTML Parsing and DOM Construction
- CSS Parsing and CSSOM Construction
- JavaScript Execution
- What does "parse" mean?
- What does defer do?
- async – Asynchronous loading and execution

📍 Timestamps:

0:00 - Introduction
00:24 - How does a Browser receive an HTML file?
03:22 - HTML Parsing and DOM Construction
04:30 - What does "parse" mean?
06:46 - DOM (Document Object Model)
07:54 - What is an HTML Element
08:52 - CSS Parsing and CSSOM Construction
10:41 - JavaScript Execution
12:41 - The problem about script tag in Head
19:54 - Solution - Defer & Async
20:19 - Defer Attribute
23:43 - Async Attribute

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