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Ejemplo con 6 cabeceras en HTML

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HTML

            
              <h1>Esto es una cabecera h1</h1>
<h2>Esto es una cabecera h2</h2>
<h3>Esto es una cabecera h3</h3>
<h4>Esto es una cabecera h4</h4>
<h5>Esto es una cabecera h5</h5>
<h6>Esto es una cabecera h6</h6>
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JS
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