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I conjecture that this idea of an accurate ruler on a web page is impossible with the current state of web and device pixel ratios that can't be detected from javascript for all devices.

Prove me wrong. I'd love to see it.

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It's amazing how the web with all the progressive apps access to your location, microphone, etc , still can't get access to the pixels dimensions of your screen.

As long as we have to worry about finger printing lots of things are unreliable or impossible on the web unfortunately. Even more so with different browsers taking different positions on these things. In the end I wonder if this is actually protecting users or if they can still be tracked regardless and it's just inhibiting native app feature parity.

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