Browser & Web Performance · Senior · Question 59 of 75

What is storage partitioning in modern browsers?

1Storing cookies in separate files per tab
✓Correct answer: Storage and caches used by a third-party iframe are keyed by the top-level site too, so the iframe can't share state across sites
3Splitting localStorage into 5 MB chunks

Explanation

It also covers the HTTP cache: a resource cached while on site A isn't reused on site B, closing cache-timing leaks.

Further reading

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