[csswizardry]

You can detect print very, very easily. I helped the NHS track print-users using this: https://csswizardry.com/2018/03/measuring-the-hard-to-measur...

Note that we can’t use `background-image: url();` here as browsers will not print background styles by default, so we’d likely miss the majority of cases.

[chrismorgan]

Good point, I completely forgot about that vector. Then there’s no privacy leak, and I go back to not being able to see why they do it the way they do! :)