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+<a id="helpers"></a>
+
+# Helper classes
+
+
+
+<a id="helpers-colors"></a>
+
+### Contextual colors
+
+Convey meaning through color with a handful of emphasis utility classes. These may also be applied to links and will darken on hover just like our default link styles.
+
+{% example html %}
+<p class="text-muted">Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.</p>
+<p class="text-primary">Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
+<p class="text-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</p>
+<p class="text-info">Maecenas sed diam eget risus varius blandit sit amet non magna.</p>
+<p class="text-warning">Etiam porta sem malesuada magna mollis euismod.</p>
+<p class="text-danger">Donec ullamcorper nulla non metus auctor fringilla.</p>
+{% endexample %}
+
+<div class="bs-callout bs-callout-info">
+  <h4>Dealing with specificity</h4>
+  <p>Sometimes emphasis classes cannot be applied due to the specificity of another selector. In most cases, a sufficient workaround is to wrap your text in a <code>&lt;span&gt;</code> with the class.</p>
+</div>
+
+
+
+<a id="helpers-bgs"></a>
+
+### Contextual backgrounds
+
+Similar to the contextual text color classes, easily set the background of an element to any contextual class. Anchor components will darken on hover, just like the text classes.
+
+{% example html %}
+<div class="bg-primary">Nullam id dolor id nibh ultricies vehicula ut id elit.</div>
+<div class="bg-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</div>
+<div class="bg-info">Maecenas sed diam eget risus varius blandit sit amet non magna.</div>
+<div class="bg-warning">Etiam porta sem malesuada magna mollis euismod.</div>
+<div class="bg-danger">Donec ullamcorper nulla non metus auctor fringilla.</div>
+{% endexample %}
+
+<div class="bs-callout bs-callout-info">
+  <h4>Dealing with specificity</h4>
+  <p>Sometimes contextual background classes cannot be applied due to the specificity of another selector. In some cases, a sufficient workaround is to wrap your element's content in a <code>&lt;div&gt;</code> with the class.</p>
+</div>
+
+
+
+<a id="helpers-close"></a>
+
+### Close icon
+
+Use a generic close icon for dismissing content like modals and alerts. **Be sure to include screen reader text when you can** as we've done with `.sr-only`.
+
+{% example html %}
+<button type="button" class="close">
+  <span aria-hidden="true">&times;</span>
+  <span class="sr-only">Close</span>
+</button>
+{% endexample %}
+
+
+
+<a id="helpers-floats"></a>
+
+### Quick floats
+
+Float an element to the left or right with a class. `!important` is included to avoid specificity issues. Classes can also be used as mixins.
+
+{% example html %}
+<div class="pull-left">...</div>
+<div class="pull-right">...</div>
+{% endexample %}
+
+{% highlight scss %}
+// Classes
+.pull-left {
+  float: left !important;
+}
+.pull-right {
+  float: right !important;
+}
+
+// Usage as mixins
+.element {
+  .pull-left();
+}
+.another-element {
+  .pull-right();
+}
+{% endhighlight %}
+
+<div class="bs-callout bs-callout-warning">
+  <h4>Not for use in navbars</h4>
+  <p>To align components in navbars with utility classes, use <code>.navbar-left</code> or <code>.navbar-right</code> instead. <a href="../components/#navbar-component-alignment">See the navbar docs</a> for details.</p>
+</div>
+
+
+
+<a id="helpers-center"></a>
+
+### Center content blocks
+
+Set an element to `display: block;` and center via `margin`. Available as a mixin and class.
+
+{% example html %}
+<div class="center-block">...</div>
+{% endexample %}
+
+{% highlight scss %}
+// Classes
+.center-block {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+// Usage as mixins
+.element {
+  .center-block();
+}
+{% endhighlight %}
+
+
+
+<a id="helpers-clearfix"></a>
+
+Easily clear `float`s by adding `.clearfix` **to the parent element**. Utilizes [the micro clearfix](http://nicolasgallagher.com/micro-clearfix-hack/) as popularized by Nicolas Gallagher. Can also be used as a mixin.
+
+{% highlight html %}
+<div class="clearfix">...</div>
+{% endhighlight %}
+
+{% highlight scss %}
+// Mixin itself
+.clearfix() {
+  &:before,
+  &:after {
+    content: " ";
+    display: table;
+  }
+  &:after {
+    clear: both;
+  }
+}
+
+// Usage as a Mixin
+.element {
+  .clearfix();
+}
+{% endhighlight %}
+
+
+
+<a id="helpers-toggles"></a>
+
+### Showing and hiding content
+
+Force an element to be shown or hidden (**including for screen readers**) with the use of `.show` and `.hidden` classes. These classes use `!important` to avoid specificity conflicts, just like the [quick floats](#helper-floats). They are only available for block level toggling. They can also be used as mixins.
+
+Furthermore, `.invisible` 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.
+
+{% highlight html %}
+<div class="show">...</div>
+<div class="hidden">...</div>
+{% endhighlight %}
+
+{% highlight scss %}
+// Classes
+.show {
+  display: block !important;
+}
+.hidden {
+  display: none !important;
+  visibility: hidden !important;
+}
+.invisible {
+  visibility: hidden;
+}
+
+// Usage as mixins
+.element {
+  .show();
+}
+.another-element {
+  .hidden();
+}
+{% endhighlight %}
+
+
+
+<a id="helpers-screen-readers"></a>
+
+### Screen readers and keyboard navigation
+
+Hide an element to all devices **except screen readers** with `.sr-only`. Combine `.sr-only` with `.sr-only-focusable` to show the element again when it's focused (e.g. by a keyboard-only user). Necessary for following [accessibility best practices](../getting-started/#accessibility). Can also be used as mixins.
+
+{% highlight html %}
+<a class="sr-only sr-only-focusable" href="#content">Skip to main content</a>
+{% endhighlight %}
+
+{% highlight scss %}
+// Usage as a Mixin
+.skip-navigation {
+  .sr-only();
+  .sr-only-focusable();
+}
+{% endhighlight %}
+
+
+
+<a id="helpers-image-replacement"></a>
+
+### Image replacement
+
+Utilize the `.text-hide` class or mixin to help replace an element's text content with a background image.
+
+{% example html %}
+<h1 class="text-hide">Custom heading</h1>
+{% endexample %}
+
+{% highlight scss %}
+// Usage as a Mixin
+.heading {
+  .text-hide();
+}
+{% endhighlight %}