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third-party-cookies

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Use when reviewing a website for privacy compliance, third-party resource loading, or cookie consent implementation.

skills/third-party-cookies/SKILL.md

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# Avoid third-party cookies

Third-party cookies enable advertising networks to build detailed behavioral profiles of users across every site they visit — without users being aware. Regulatory penalties for non-compliance with GDPR reach up to 4% of global annual turnover.

## Quick Reference

- Third-party cookies are set by a domain other than the one the user is visiting — typically by ad networks, analytics, or embedded widgets
- Chrome is removing third-party cookie support and all major browsers now block or restrict them
- Use the Network DevTools panel to identify `Set-Cookie` headers from third-party domains
- GDPR (EU), CCPA (California), and PECR (UK) require informed consent before setting non-essential cookies
- Alternatives: first-party data collection, privacy-preserving analytics (Plausible, Fathom), server-side tracking

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