How does backdrop-filter work?

Short answer: It applies visual effects (like blur, brightness, or contrast) to the area behind an element.

Example code

.blur-bg { backdrop-filter: blur(10px); background: rgba(255, 255, 255, 0.3); } Key Takeaway: Used for modern UI effects (like frosted glass) — supported in modern browsers only. Follow me on LinkedIn: JavaScript Interview Questions

Real-world example (ShopNest)

ShopNest’s browser cart uses modern JavaScript: fetch APIs with async/await, modules, and clear error handling.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.