Angular · Middle · Question 73 of 75

What is `@defer (on viewport; prefetch on idle)` for?

✓Correct answer: Loading the code when the browser is idle, but rendering the block only when the placeholder enters the viewport
2Rendering twice: once idle, once in viewport
3Prefetching data for the block on the server

Explanation

Separating prefetch and render triggers makes the block appear instantly when scrolled to, without loading it upfront.

Further reading

Angular: Deferred loading with @defer ↗

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