<head>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        #box {
            width: 100px;
            height: 100px;
            background-color: blue;
            position: relative;
        }
        button {
            margin-top: 10px;
            padding: 5px 10px;
            font-size: 16px;
            cursor: pointer;
        }
    </style>
</head>
<body>

    <div id="box"></div>
    <br>
    <button id="startBtn">Start Animation</button>
    <button id="stopBtn">Stop Animation</button>

    <script>
        $(document).ready(function(){
            $("#startBtn").click(function() {
                $("#box").animate({ width: "300px", height: "150px", left: "200px" }, 3000);
            });

            $("#stopBtn").click(function() {
                $("#box").stop(true, true);
            });
        });
    </script>
</body>

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.