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* [[HTML]] markup changes, depending on the methods used to harvest the content of a website, even a small change in HTML data can render a scraping tool broken until it is updated.
* General changes in detection systems. In the past years search engines have tightened their detection systems nearly month by month making it more and more difficult to reliable scrape as the developers need to experiment and adapt their code regularly.<ref>{{cite web|url=https://productforums.google.com/forum/#!topic/websearch/MAju1QDF6_8|title=Google Groups|website=google.com}}</ref>
== Detection ==
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