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Using the validator.w3 shows me the next error:

Error: The element h3 must not appear as a descendant of the address element.

And also this other error:

Error: The frameborder attribute on the iframe element is obsolete. Use CSS instead.

So, my question is: how can I replace the h3 inside the address tag? which is the tag to use? and then, how can I fix the `iframe error?

The code is: 

<section id="Contacto">
    <div>
        <h2 class="concon">Contacto</h2>
        <div class="grupo-columnas centrar-columnas">
            <div class="columna">
                <address>
                    <h3>Mail</h3>
                    <a href="mailto:info@hyperx.com.ar" class="edit">info@hyperx.com.ar</a>
                    <h3>Llamanos</h3>
                    <a href="tel:540111122669288" class="edit">+54 011 2266-9288</a>
                    <h3>Ubicación</h3>
                    <p>Galería Jardín, Florida 537, Local 403, 1049 Buenos Aires</p>
                </address>
                <iframe id="mapa" src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d5523.179529963751!2d-58.37788072464045!3d-34.6015771771587!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x95bccb43fa34ea69%3A0x9a4a3f10bd59e3e!2sFullh4rd!5e0!3m2!1ses-419!2sar!4v1591886402346!5m2!1ses-419!2sar" width="600" height="450" frameborder="0" style="border:0;" allowfullscreen="" aria-hidden="false" tabindex="0"></iframe>
            </div>
        </div>
    </div>
</section>
Alessio Cantarella
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Santiago Portillo
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    There are a variety of tags you can use inside the address tag, like ``, `

    `, and `

    `. Just style them as needed
     – j08691 Jun 12 '20 at 13:45

1 Answers1

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Error: The element h3 must not appear as a descendant of the address element.

Use a text element like <em>, <span> or <p>. Apply any needed styling to that element to get the desired result

Error: The frameborder attribute on the iframe element is obsolete. Use CSS instead.

Remove the frameborder="0" from the <iframe> and apply some css to get the same result: iframe { border: none }.

Apparently, this has already been answered on StackOverflow: "The frameborder attribute on the iframe element is obsolete. Use CSS instead."

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