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Rules are directly applied to <iframe><embed><video>, and <object> elements; optionally use an explicit descendant class.embed-responsive-item when you want to match the styling for other attributes.

<div class="embed-responsive embed-responsive-16by9">
    <iframe class="embed-responsive-item" src="..."></iframe>

Building & Branding Websites that Get Results

The world's fastest and most SEO friendly website code.