Responsive Iframe/Embed

This is the example code to embed the youtube embed code in 16/9 ratio 

<div class="ratio ratio-16x9">
    <iframe class="embed-responsive-item" src="https://www.youtube.com/embed/jxEPwNK_K2I?rel=0" allowfullscreen></iframe>
</div>

You can see this link for more info about iframe and other element.

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