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Using javascript to verify users' typing style in a browser using javascript, we can verify their keystroke dynamics. We want to collect only one class, meaning we want to be able to have predictions based only on positive examples. We will use features that are already proven to be consistent: Hold time – time between press and release of a key. Hold time, keydown time and keyup time are the 3 most widely used features for keystroking dynamics are: The 3 most commonly used features are:Hold time, Keydown time –. time between the pressing of consecutive keys.