Browser & Web Performance · Senior · Question 8 of 75

What are XS-Leaks?

✓Correct answer: Side-channel attacks where a site infers information about another site (e.g. login state) via timing, frame counts or errors
2Memory leaks caused by cross-site iframes
3Leaking CSS styles between origins

Explanation

Defenses include COOP, CORP, SameSite cookies, Fetch Metadata checks and avoiding observable differences in responses.

Further reading

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