What are the best scenarios for utilizing the Bootstrap class “.embed-responsive-item”?

I'm hoping for some help understanding the purpose of the ".embed-responsive-item" class in the code snippet below (Bootstrap code for responsive iframes, videos, etc.). It seems redundant to apply this class to the iframe element when it works just fine without it:

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

This is essentially the same as:

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

So why include it at all?

Source: http://getbootstrap.com/components/#responsive-embed

"Optionally use an explicit descendant class .embed-responsive-item when you want to match the styling for other attributes."

What does this statement actually mean? Can you provide an example?

csstwitter-bootstrapiframetwitter-bootstrap-3

Answer №1

It has been discovered that there is no purpose to using the .embed-responsive-item class, as confirmed by examining responsive-embed.less. This class applies the same styling as a plain iframe element.

However, if you are working with a content generator that requires an additional layer of markup (such as a wrapping <div/> between the parent <div 'embed-responsive'> and the <iframe/>), then utilizing this class may be beneficial in maintaining the correct width / height ratio.

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