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Online testing of Web-based applications

Testing of Web-based applications is difficult. Online testing of Web-based applications is more difficult. We argue the motivation of online testing, especially those of Web-based applications. We explain what online testing is, what it concerns, and the difference between online testing and offline testing. We introduce some key problems, such as how to reduce the interference to the normal services of system, how to improve the efficiency of online testing, etc. In the end, current research works including our primary research work were introduced.