Kod


     <!DOCTYPE html>
<html lang="pl">
<head>
    <meta charset="UTF-8">
</head>
    <div>
        Szerokość: <input type="number" id="boka" value="200">
        <br>
        Wysokość: <input type="number" id="bokb" value="200">
    </div>
    <div>
        <span id="kwadrat"></span>
        <br>
        <div>
            <span id="wynik"></span>
        </div>
        <img id="obraz" src="https://picsum.photos/200" alt="obraz">
    </div>
    <div onmouseover=f1(this) onmouseout=f2(this)>ala ma kota</div>
    <script src="script/zdarznia.js"></script>
</body>
</html>