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Re:CSS @property and the New Style by d4mi3n on Thursday September 05, 2024 @02:24AM (#41454086)
Yes and yes. You’ve already pointed out fingerprinting, but there are other attacks that can be done.

See:

- CSS keylogger, 2018: https://github.com/maxchehab/CSS-Keylogging

- OWASP cites CSS injection as a mechanism for XSS and data exfiltration: https://owasp.org/www-project-web-security-testing-guide/sta...

Luckily we haven’t seen new classes of attacks here, but being concerned about attack surface of any browser technology is valid and reasonable.

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