<!DOCTYPE html>
<html>

<head>
    <title>Complete JavaScript Course</title>
    <style>
        .holder {
            display: inline-block;
            width: 300px;
            height: 300px;
            border: 1px solid black;
            padding: 10px;
        }

        .active {
            background-color: red;
        }
    </style>
</head>

<body> 
      <div class="holder">   
            <div id="output"></div>   
    </div>   
    <script>     
        const ele = document.querySelector('.holder');
        ele.addEventListener('mouseover', () => { this.classList.add('active'); })
        ele.addEventListener('mouseout', () => { this.classList.remove('active'); })
        ele.addEventListener('mousemove', coordin);
        function coordin() {
            let html = "X:" + event.clientX + " | Y:" + event.clientY;
            document.getElementById('output').innerHTML = html;
        }
    </script>
</body>

</html>
