I suspect this how a large part of web UI spam occurs. Selenium combined with the latest browsers provide almost perfect control over a real web browser. It makes me wonder if this is how Google tests its "I am not a bot" test. Basically, generate billions of actions -- surfing a web UI -- with slightly different mouse movements (Selenium). Then, use machine learning to generate a network to differentiate between robots and humans. (The humans training data would come from a highly quality population... like all Googlers using internal Google assets/websites.)