Navigation available in Bootstrap share general markup and styles, from the base `.nav` class to the active and disabled states. Swap modifier classes to switch between each style.
## Contents
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## Regarding accessibility
If you are using navs to provide a navigation bar, be sure to add a `role="navigation"` to the most logical parent container of the `<ul>`, or wrap a `<nav>` element around the whole navigation. Do not add the role to the `<ul>` itself, as this would prevent it from being announced as an actual list by assistive technologies.
## Base nav
Roll your own navigation style by extending the base `.nav` component. All Bootstrap's nav components are built on top of this by specifying additional styles. Includes styles for the disabled state, but **not the active state**.
Classes are used throughout, so your markup can be super flexible. Use `<ul>`s like above, or roll your own with say a `<nav>` element. The change in nav item display below **is intentional** as `<li>`s have a different default `display` than regular `<a>` elements.
Takes the basic nav from above and adds the `.nav-tabs` class to generate a tabbed interface. Use them to create tabbable regions with our [tab JavaScript plugin](#javascript-behavior).
Add `.nav-stacked` to the `.nav.nav-pills` to stack them vertically. Each `.nav-link` becomes block-level, allowing for larger hit areas via mouse or tap.
Use the tab JavaScript plugin—include it individually or through the compiled `bootstrap.js` file—to extend our navigational tabs and pills to create tabbable panes of local content, even via dropdown menus.
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### Using data attributes
You can activate a tab or pill navigation without writing any JavaScript by simply specifying `data-toggle="tab"` or `data-toggle="pill"` on an element. Use these data attributes on `.nav-tabs` or `.nav-pills`.
Selects the given tab and shows its associated pane. Any other tab that was previously selected becomes unselected and its associated pane is hidden. **Returns to the caller before the tab pane has actually been shown** (i.e. before the `shown.bs.tab` event occurs).
{% highlight js %}
$('#someTab').tab('show')
{% endhighlight %}
### Events
When showing a new tab, the events fire in the following order:
1.`hide.bs.tab` (on the current active tab)
2.`show.bs.tab` (on the to-be-shown tab)
3.`hidden.bs.tab` (on the previous active tab, the same one as for the `hide.bs.tab` event)
4.`shown.bs.tab` (on the newly-active just-shown tab, the same one as for the `show.bs.tab` event)
If no tab was already active, then the `hide.bs.tab` and `hidden.bs.tab` events will not be fired.
<td>This event fires on tab show, but before the new tab has been shown. Use <code>event.target</code> and <code>event.relatedTarget</code> to target the active tab and the previous active tab (if available) respectively.</td>
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<td>shown.bs.tab</td>
<td>This event fires on tab show after a tab has been shown. Use <code>event.target</code> and <code>event.relatedTarget</code> to target the active tab and the previous active tab (if available) respectively.</td>
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<td>hide.bs.tab</td>
<td>This event fires when a new tab is to be shown (and thus the previous active tab is to be hidden). Use <code>event.target</code> and <code>event.relatedTarget</code> to target the current active tab and the new soon-to-be-active tab, respectively.</td>
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<td>hidden.bs.tab</td>
<td>This event fires after a new tab is shown (and thus the previous active tab is hidden). Use <code>event.target</code> and <code>event.relatedTarget</code> to target the previous active tab and the new active tab, respectively.</td>
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{% highlight js %}
$('a[data-toggle="tab"]').on('shown.bs.tab', function (e) {
