Browser & Web Performance · Middle · Question 36 of 75

What is a facade for a heavy third-party embed, like a video player?

1A proxy server that caches the embed
✓Correct answer: A lightweight static preview that loads the real embed only when the user interacts with it
3An iframe with sandbox that blocks the embed's scripts

Explanation

Many visitors never press play, so they never pay for the player's hundreds of kilobytes of JS.

Further reading

web.dev: Efficiently load third-party JavaScript ↗

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