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> detect visited links

Is this still possible? I was under the impression this is prevented in most browsers.

Well, browser vendors keep adding features, and in 2014, it was predicted by lcamtuf that the mix-blend-mode property would be useful to access browser history:

https://lcamtuf.blogspot.fr/2016/08/css-mix-blend-mode-is-ba...

Two years later, it was implemented, and the demo seems to be working here in Firefox 56: http://lcamtuf.coredump.cx/whack/

Also wrt battery status - that's only Chrome thing these days.

http://caniuse.com/#feat=battery-status

For firefox there is dom.battery.enabled and https://developer.mozilla.org/en-US/docs/Web/API/Battery_Sta... but it seems that since 42 it is enabled only for addons. It seems that I was wrong about that indeed.

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