Kod


     <!DOCTYPE html>
<html lang="pl">
<head>
    <meta charset="UTF-8">
</head>
<body>
    <img id="shrek" src="https://purepng.com/public/uploads/large/purepng.com-shrek-runningshrekcomputer-animatedfantasy-filmfairy-talebook-1701528653765d5gyq.png">

    <script>
        let pic = document.getElementById("shrek");

        let width = Math.round(Math.random() * 1000) + "px";
        let height = Math.round(Math.random() * 1000) + "px";

        pic.style.width = width;
        pic.style.height = height;

        console.info("width: " + width);
        console.info("height: " + height);
    </script>
</body>
</html>