Kod


     <!DOCTYPE html>
<html lang="pl">
<head>
    <meta charset="UTF-8">
</head>
<body>
    <img id="obraz1">
    <img id="obraz2">

    <script>
        let dog = "https://www.pieski.net/psy/d/slodki-awka-mops-jablko-szczeniaczek-jesien.jpeg";
        let cat = "https://www.tapeciarnia.pl/fotki/d/26033_1502304260_6567.jpg";
        let pic1 = document.getElementById("obraz1");
        let pic2 = document.getElementById("obraz2");

        if (Math.random().toFixed(1) >= 0.5) {
            pic1.src = dog;
            pic2.src = cat;
        } else {
            pic1.src = cat;
            pic2.src = dog;
        }

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

        pic1.style.width = width;
        pic2.style.width = width;
    </script>
</body>
</html>