<html>
<head>
<style>
    embed, iframe, img { border: 1px solid black; width: 25px; height: 25px; }
</style>
</head>
<body>
    <div style="width: 30px; border: 1px solid red;">
        <input type="text"><input type="text">
        <img><img>
        <input type="button" value="input"><input type="button" value="input">
        <button>button</button><button>button</button>
        <select><option>select</option></select><select><option>select</option></select>
        <select size="3"><option>select</option></select><select size="3"><option>select</option></select>
        <input type="checkbox"><input type="checkbox">
        <input type="radio"><input type="radio">
        <iframe></iframe><iframe></iframe>
        <embed type="video/quicktime"></embed><embed type="video/quicktime"></embed>
    </div>
</body>
</html>