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They add a little javascript function that they call advertisment.js or something similar which just adds a div to the page (e.g.: document.write('<div id="test
by fizz_and_buzz 13y ago
They add a little javascript function that they call advertisment.js or something similar which just adds a div to the page (e.g.: document.write('<div id="test"></div>');
). They then check if the div exists when the document is ready and notify the server. Adblock has a filter feature where you can enable specific javascript functions on a site, which allows you to circumvent this trick.