index.html

<!DOCTYPE html>
<html>

<head>
    <meta charset='utf-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>Jelly Button Animation Using GSAP</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <link rel='stylesheet' type='text/css' media='screen' href='style.css'>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.1/gsap.min.js"></script>
</head>

<body>
    <button class="button">Click me</button>

    <script>
        var $button = document.querySelector(".button");

        $button.addEventListener("click", function () {
            var duration = 0.3, delay = 0.08;
            TweenMax.to($button, duration, {
                scaleY: 1.6,
                ease: Expo.easeOut
            });
            TweenMax.to($button, duration, {
                scaleX: 1.2,
                scaleY: 1,
                ease: Back.easeOut,
                easeParams: [3],
                delay: delay
            });
            TweenMax.to($button, duration * 1.25, {
                scaleX: 1,
                scaleY: 1,
                ease: Back.easeOut,
                easeParams: [6],
                delay: delay * 3
            });
        });
    </script>
</body>

</html>
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