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Now, two security researchers from Princeton University have shown that the battery status indicator really is being used in the wild to track users. By running a specially modified browser, Steve Engelhard and Arvind Narayanan found two tracking scripts that used the API to “fingerprint” a specific device, allowing them to continuously identify it across multiple contexts. Battery Status Indicators Can Track Users [theguardian.com]
And while it is only tracking scripts using it now, Olejnik warns that unscrupulous actors could do more.