From my understanding: if the page as a whole is not obfuscated then irrespective of how much messed-up html and JS you couch the ad in, then the ad blocker can

From my understanding: if the page as a whole is not obfuscated then irrespective of how much messed-up html and JS you couch the ad in, then the ad blocker can just remove the base element. If the entire page is obfuscated it becomes a more difficult problem.