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Document .pos-f-t utility class; fixes #18494

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Add documentation to components/utilities to publicly expose the
.pos-f-t utility class to users.

Closes #18799
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Russell Beye 2016-01-07 22:34:13 -06:00 committed by Chris Rebert
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docs/components/utilities.md
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@ -229,6 +229,20 @@ Easily clear `float`s by adding `.clearfix` **to the parent element**. Utilizes
}
{% endhighlight %}
## Fixed positioning
The `.pos-f-t` class can be used to easily position elements at the top of the viewport and make them as wide as the viewport. **Be sure you understand the ramifications of fixed-position elements within your project.** Here's how the class is defined:
{% highlight scss %}
.pos-f-t {
position: fixed;
top: 0;
right: 0;
left: 0;
z-index: $zindex-navbar-fixed;
}
{% endhighlight %}
## Invisible content
The `.invisible` class can be used to toggle only the visibility of an element, meaning its `display` is not modified and the element can still affect the flow of the document.