You could just load a different (invisible) background image based on the visite... | Hacker News

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		nedt on May 7, 2024 \| parent \| context \| favorite \| on: Caniemail.com – like caniuse but for email content You could just load a different (invisible) background image based on the visited state to send out a ping.

kevincox on May 7, 2024 [–]

I recommend reading https://developer.mozilla.org/en-US/docs/Web/CSS/:visited

> For privacy reasons, the styles that can be modified using this selector are very limited

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