Tracking clues hidden in page stylesSourced
Turning off JavaScript does not rule out every kind of fingerprinting.
CSS normally controls a web page's appearance. Conditional style rules can also reveal clues about a visitor's screen or fonts and send the result through a network request. This form of fingerprinting can work without a cookie or JavaScript.
Even style rules can reveal something about a device.
Summary / translation: Unbubly · CC BY-SA 4.0
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CSS fingerprinting · Wikimedia contributors
Adapted, summarized and translated from the source. Adapted text is also available under CC BY-SA 4.0.
Reviewed: 2026-10-01