Untitled

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<html lang="en">
<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!--intenté con h1 después de intentar con class="square"-->
    <h1>
        <svg viewBox="0 0 100 100">

            <rect
                x="10" y="10"
                width="20%" height="20"
            />
        
        
        
        </svg>
    </h1>
    
</body>
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