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Beauty at a Cost: Privacy Implications of CSS on the Web and in Emails

Talkat RuhrSec 2025 · 2025-02-20..02-21· [security, web-platform]
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Explores how CSS can be abused for cross-site and email-based tracking and profiling without cookies or JavaScript, showing concrete privacy risks in modern browser engines and HTML email clients. Discusses CSS-based fingerprinting techniques as a vector for tracking, targeted phishing, and spam, and highlights gaps in current JavaScript-focused mitigations.

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