How Browser Executes JavaScript

Flow:

1. Browser reads HTML
2. Builds DOM
3. Finds <script>
4. Stops HTML parsing ⛔
5. Executes JS
6. Continues loading

 JS is blocking by default

That means:

• If JS takes time → page load slows

Use:

<script defer src="script.js"></script>

👉 defer = run JS after HTML loads