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| layout | title | description | group | redirect_from | toc | ||||
|---|---|---|---|---|---|---|---|---|---|
| docs | Introduction | Get started with Bootstrap, the world's most popular framework for building responsive, mobile-first sites, with BootstrapCDN and a template starter page. | getting-started |
|
true |
Quick start
Looking to quickly add Bootstrap to your project? Use BootstrapCDN, provided for free by the folks at MaxCDN. Using a package manager or need to download the source files? [Head to the downloads page.]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/download/)
CSS
Copy-paste the stylesheet <link> into your <head> before all other stylesheets to load our CSS.
{% highlight html %}
{% endhighlight %}JS
Many of our components require the use of JavaScript to function. Specifically, they require jQuery, Popper.js, and our own JavaScript plugins. Place the following <script>s near the end of your pages, right before the closing </body> tag, to enable them. jQuery must come first, then Popper.js, and then our JavaScript plugins.
We use jQuery's slim build, but the full version is also supported.
{% highlight html %}
{% endhighlight %}
Curious which components explicitly require jQuery, our JS, and Popper.js? Click the show components link below. If you're at all unsure about the general page structure, keep reading for an example page template.
Show components requiring JavaScript
{% markdown %} - Alerts for dismissing - Buttons for toggling states and checkbox/radio functionality - Carousel for all slide behaviors, controls, and indicators - Collapse for toggling visibility of content - Dropdowns for displaying and positioning (also requires [Popper.js](https://popper.js.org/)) - Modals for displaying, positioning, and scroll behavior - Navbar for extending our Collapse plugin to implement responsive behavior - Tooltips and popovers for displaying and positioning (also requires [Popper.js](https://popper.js.org/)) - Scrollspy for scroll behavior and navigation updates {% endmarkdown %}Starter template
Be sure to have your pages set up with the latest design and development standards. That means using an HTML5 doctype and including a viewport meta tag for proper responsive behaviors. Put it all together and your pages should look like this:
{% highlight html %} <!doctype html>
<html lang="en"> <head><!-- Bootstrap CSS -->
<link rel="stylesheet" href="{{ site.cdn.css }}" integrity="{{ site.cdn.css_hash }}" crossorigin="anonymous">
<title>Hello, world!</title>
Hello, world!
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="{{ site.cdn.jquery }}" integrity="{{ site.cdn.jquery_hash }}" crossorigin="anonymous"></script>
<script src="{{ site.cdn.popper }}" integrity="{{ site.cdn.popper_hash }}" crossorigin="anonymous"></script>
<script src="{{ site.cdn.js }}" integrity="{{ site.cdn.js_hash }}" crossorigin="anonymous"></script>
That's all you need for overall page requirements. Visit the [Layout docs]({{ site.baseurl }}/docs/{{ site.docs_version }}/layout/overview/) or [our official examples]({{ site.baseurl }}/docs/{{ site.docs_version }}/examples/) to start laying out your site's content and components.
Important globals
Bootstrap employs a handful of important global styles and settings that you'll need to be aware of when using it, all of which are almost exclusively geared towards the normalization of cross browser styles. Let's dive in.
HTML5 doctype
Bootstrap requires the use of the HTML5 doctype. Without it, you'll see some funky incomplete styling, but including it shouldn't cause any considerable hiccups.
{% highlight html %} <!doctype html>
<html lang="en"> ... </html> {% endhighlight %}Responsive meta tag
Bootstrap is developed mobile first, a strategy in which we optimize code for mobile devices first and then scale up components as necessary using CSS media queries. To ensure proper rendering and touch zooming for all devices, add the responsive viewport meta tag to your <head>.
{% highlight html %}
{% endhighlight %}You can see an example of this in action in the starter template.
Box-sizing
For more straightforward sizing in CSS, we switch the global box-sizing value from content-box to border-box. This ensures padding does not affect the final computed width of an element, but it can cause problems with some third party software like Google Maps and Google Custom Search Engine.
On the rare occasion you need to override it, use something like the following:
{% highlight css %} .selector-for-some-widget { box-sizing: content-box; } {% endhighlight %}
With the above snippet, nested elements—including generated content via ::before and ::after—will all inherit the specified box-sizing for that .selector-for-some-widget.
Learn more about box model and sizing at CSS Tricks.
Reboot
For improved cross-browser rendering, we use [Reboot]({{ site.baseurl }}/docs/{{ site.docs_version }}/content/reboot/) to correct inconsistencies across browsers and devices while providing slightly more opinionated resets to common HTML elements.
Community
Stay up to date on the development of Bootstrap and reach out to the community with these helpful resources.
- Follow @getbootstrap on Twitter.
- Read and subscribe to [The Official Bootstrap Blog]({{ site.blog }}).
- Join [the official Slack room]({{ site.slack }}).
- Chat with fellow Bootstrappers in IRC. On the
irc.freenode.netserver, in the##bootstrapchannel. - Implementation help may be found at Stack Overflow (tagged
bootstrap-4). - Developers should use the keyword
bootstrapon packages which modify or add to the functionality of Bootstrap when distributing through npm or similar delivery mechanisms for maximum discoverability.
You can also follow @getbootstrap on Twitter for the latest gossip and awesome music videos.