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Jquery is indeed the most compressed and efficient library of JavaScript introduced so far that has made a web developer's job more easy. Its built in functions of show(), hide(), AJAX() and my beloved scrollTop() are indeed the most used functions that gives a new life to user interface (UI). CSS3 animations using @Keyframes rule is one of the most innovative things I came across so far. Pseudo elements such as :before and :after are increasingly being used now because they eliminated the use of unnecessary div tags.