JavaScript mein Script Tag sirf JavaScript file ko include karne ke liye nahi hota. Iske different attributes browser ko ye control karne mein help karte hain ki JavaScript ko kab load karna hai, kab execute karna hai aur page ke saath kaise behave karna hai.

Is video mein hum JavaScript ke Script Tag aur uske important attributes ko easy language mein samjhenge — specially async, defer, loading, performance, security aur browser behavior ko.

📌 IS VIDEO MEIN KYA SEEKHENGE?

✅ Normal Script Tag aur parser-blocking behavior
✅ HTML parsing aur JavaScript execution
✅ Script ko Body ke end mein rakhne ka workaround
✅ async attribute — kaise kaam karta hai?
✅ async scripts ka execution order
✅ async aur DOMContentLoaded
✅ Dynamically inserted scripts
✅ Dynamic scripts mein async = false
✅ defer attribute — kaise kaam karta hai?
✅ async vs defer — actual difference
✅ Multiple defer scripts ka execution order
✅ defer aur DOMContentLoaded
✅ src attribute
✅ type=”module” aur JavaScript Modules
✅ crossorigin aur CORS
✅ integrity aur Subresource Integrity (SRI)
✅ nomodule aur legacy browsers
✅ referrerpolicy aur privacy
✅ blocking=”render”
✅ attributionsrc
✅ fetchpriority aur resource loading priority

⚡ ASYNC VS DEFER — QUICK DIFFERENCE

async:
Download parallel → Download complete hote hi execute

defer:
Download parallel → HTML parsing complete hone ke baad execute

Lekin browser actually in scripts ko kaise handle karta hai, multiple scripts ke saath kya hota hai, aur in attributes ko real-world projects mein kab use karna chahiye — ye sab video mein examples ke saath explain kiya gaya hai.

Agar aap JavaScript, Frontend Development ya Web Development seekh rahe hain, toh Script Tag ka ye behavior samajhna bahut important hai.

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