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71 lines
2.6 KiB
Markdown
71 lines
2.6 KiB
Markdown
---
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layout: docs
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title: Responsive helpers
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group: utilities
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---
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## Responsive embeds
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Allow browsers to determine video or slideshow dimensions based on the width of their containing block by creating an intrinsic ratio that will properly scale on any device.
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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.
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**Pro-Tip!** You don't need to include `frameborder="0"` in your `<iframe>`s as we override that for you.
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{% example html %}
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<div class="embed-responsive embed-responsive-16by9">
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<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/zpOULjyy-n8?rel=0" allowfullscreen></iframe>
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</div>
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{% endexample %}
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Aspect ratios can be customized with modifier classes.
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{% highlight html %}
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<!-- 21:9 aspect ratio -->
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<div class="embed-responsive embed-responsive-21by9">
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<iframe class="embed-responsive-item" src="..."></iframe>
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</div>
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<!-- 16:9 aspect ratio -->
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<div class="embed-responsive embed-responsive-16by9">
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<iframe class="embed-responsive-item" src="..."></iframe>
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</div>
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<!-- 4:3 aspect ratio -->
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<div class="embed-responsive embed-responsive-4by3">
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<iframe class="embed-responsive-item" src="..."></iframe>
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</div>
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<!-- 1:1 aspect ratio -->
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<div class="embed-responsive embed-responsive-1by1">
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<iframe class="embed-responsive-item" src="..."></iframe>
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</div>
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{% endhighlight %}
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## Responsive floats
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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](https://developer.mozilla.org/en-US/docs/Web/CSS/float). `!important` is included to avoid specificity issues. These use the same viewport width breakpoints as the grid system.
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Two similar non-responsive Sass mixins (`float-left` and `float-right`) are also available.
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{% example html %}
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<div class="float-left">Float left on all viewport sizes</div><br>
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<div class="float-right">Float right on all viewport sizes</div><br>
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<div class="float-none">Don't float on all viewport sizes</div><br>
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<div class="float-sm-left">Float left on viewports sized SM (small) or wider</div><br>
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<div class="float-md-left">Float left on viewports sized MD (medium) or wider</div><br>
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<div class="float-lg-left">Float left on viewports sized LG (large) or wider</div><br>
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<div class="float-xl-left">Float left on viewports sized XL (extra-large) or wider</div><br>
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{% endexample %}
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{% highlight scss %}
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// Related simple non-responsive mixins
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.element {
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@include float-left;
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}
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.another-element {
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@include float-right;
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}
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{% endhighlight %}
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