Hi @killarnee. You can achieve that by using custom dimensions: https://matomo.org/docs/custom-dimensions/

@sgiehl Thanks, I've tried it, but I think it fits better with the built-in standard metrics like display width. I mean settings like prefers-color-scheme, I don't know if you can track this with JavaScript at all, but it's worth a try.

I would be happy if this idea would be pursued further.

@killarnee Tracking CSS properties with javascript is possible. But it also requires some special css, which can be access by the javascript. E.g. some sort of element that is only visible for certain css media selectors and then check in javascript if it is visible or not. Nevertheless this wont be something we will include in core, but this might be a candidate for an additional plugin.