this post was submitted on 25 Oct 2023
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Not all ad blockers remove elements from web pages, and if they acted that predictably you could detect the ad blocker by detecting whether an expected element is hidden.
I have not looked through an ad blocker's code, but I don't believe it is that simple.
Looking at this blogpost for a wordpress blocking plugin, it basically is just adding a bunch of css classes commonly used by ads to a div and some workarounds to support ad blockers that work by blocking files.