What is the will-change property?

Short answer: It hints the browser that an element will soon change, so the browser can optimize rendering ahead of time.

Example code

.box { will-change: transform, opacity; } Key Takeaway: Improves animation performance but use carefully — too many can waste memory.

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.