Bootstrap/docs/4.0/utilities/responsive-helpers.md

layout	title	description	group	toc
docs	Responsive helpers	Create responsive video or slideshow embeds based on the width of the parent by creating an intrinsic ratio that scales on any device.	utilities	true

Responsive embeds

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.

Pro-Tip! You don't need to include frameborder="0" in your <iframe>s as we override that for you.

{% example html %}

{% endexample %}

Aspect ratios can be customized with modifier classes.

{% highlight html %}

{% endhighlight %}

Responsive floats

These utility classes float an element to the left or right, or disable floating, based on the current viewport size using the CSS float property. !important is included to avoid specificity issues. These use the same viewport width breakpoints as the grid system.

Two similar non-responsive Sass mixins (float-left and float-right) are also available.

{% example html %}

Float left on all viewport sizes

Float right on all viewport sizes

Don't float on all viewport sizes

Float left on viewports sized SM (small) or wider

Float left on viewports sized MD (medium) or wider

Float left on viewports sized LG (large) or wider

Float left on viewports sized XL (extra-large) or wider

{% endexample %}

{% highlight scss %} // Related simple non-responsive mixins .element { @include float-left; } .another-element { @include float-right; } {% endhighlight %}