How to do auto-width with HTML IFrame

Demo

html, body {
    height:100%;
    width:100%;
    margin:0;
}
.h_iframe iframe {
    width:100%;
    height:100%;
}
.h_iframe {
    height: 100%;
    width:100%;
}

HTML

<div class="h_iframe">
    <iframe src="//www.youtube.com/embed/9KunP3sZyI0" frameborder="0" allowfullscreen></iframe>
</div>

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