Incidentally, it is quite funny that the very same list AdBlock uses to hide ads can be used against it. The part that would trigger every ad blocker in the example above is the class name “banner_ad”, easily found among many other similarly named ad-related elements in most ad-blocker blacklists. Here’s an example of a website element that will work like bait and be hidden by AdBlock: This usually involves the implementation of a “bait” script-a tiny piece of code that an ad blocker is likely to perceive as an ad.
Websites can resort to a combination of simple methods that (at least) tell whether or not a visitor to the website is using an ad blocker. This is half the battle if such elements aren’t found, the publisher can display an anti-ad-block message kindly asking the visitor to either whitelist the page, highlighting the importance and benefits of not using ad-blocking software, or block access to the webpage completely (see image below).
While ad-blocking software can’t be detected by the websites directly, one can assume their presence by testing whether particular elements of the page have been displayed. The rise of ad-blocking software means publishers have to come up with new ways to make up the lost revenue, whether by using various custom-made ad re-insertion software or by putting up paywalls (like the one shown below from The Economist.)
Conversely, there is no way for publishers to make their websites completely and consistently immune to ad blockers. There is no way for users to make ad blockers completely invisible to sites or services that show anti-ad-blocking messages. The tug of war between publishers and those who resist display ads has been going on for some time now and is far from over.
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