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Bootstrap/site/content/docs/4.3/getting-started/introduction.md
Mark Otto 33a4e8ff9b Rewrite grid docs to account for new grid tier 
- Breaks grid content across multiple pages
- Updates mentions of grid tiers from five to six
- Rewrites how it works sections to reference new options and tiers
2020-04-13 13:55:34 -07:00

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layout title description group aliases 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
/docs/4.3/getting-started/
/docs/getting-started/
/getting-started/
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Quick start

Looking to quickly add Bootstrap to your project? Use BootstrapCDN, provided for free by the folks at StackPath. Using a package manager or need to download the source files? [Head to the downloads page]({{< docsref "/getting-started/download" >}}).

CSS

Copy-paste the stylesheet <link> into your <head> before all other stylesheets to load our CSS.

{{< highlight html >}}

}}" integrity="{{< param "cdn.css_hash" >}}" crossorigin="anonymous"> {{< /highlight >}}

JS

Many of our components require the use of JavaScript to function. Specifically, they require our own JavaScript plugins and Popper.js. Place the following <script>s near the end of your pages, right before the closing </body> tag, to enable them. Popper.js must come first, and then our JavaScript plugins.

{{< highlight html >}}

{{< /highlight >}}

If you use <script type="module">, please refer to our [using Bootstrap as a module]({{< docsref "/getting-started/javascript#using-bootstrap-as-a-module" >}}) section.

Curious which components explicitly require our JavaScript 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.

Our bootstrap.bundle.js and bootstrap.bundle.min.js include Popper. For more information about what's included in Bootstrap, please see our [contents]({{< docsref "/getting-started/contents#precompiled-bootstrap" >}}) section.

{{< partial "getting-started/components-requiring-javascript" >}}

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="{{< param "cdn.css" >}}" integrity="{{< param "cdn.css_hash" >}}" crossorigin="anonymous">

<title>Hello, world!</title>
</head>

Hello, world!

<!-- Optional JavaScript -->
<!-- Popper.js first, then Bootstrap JS -->
<script src="{{< param "cdn.popper" >}}" integrity="{{< param "cdn.popper_hash" >}}" crossorigin="anonymous"></script>
<script src="{{< param "cdn.js" >}}" integrity="{{< param "cdn.js_hash" >}}" crossorigin="anonymous"></script>
</html> {{< /highlight >}}

That's all you need for overall page requirements. Visit the [Layout docs]({{< docsref "/layout/grid" >}}) or [our official examples]({{< docsref "/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> {{< /highlight >}}

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 >}}

{{< /highlight >}}

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; } {{< /highlight >}}

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]({{< docsref "/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](https://twitter.com/{{< param twitter >}}).
  • Read and subscribe to [The Official Bootstrap Blog]({{< param blog >}}).
  • Join [the official Slack room]({{< param slack >}}).
  • Chat with fellow Bootstrappers in IRC. On the irc.freenode.net server, in the ##bootstrap channel.
  • Implementation help may be found at Stack Overflow (tagged bootstrap-4).
  • Developers should use the keyword bootstrap on 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](https://twitter.com/{{< param twitter >}}) for the latest gossip and awesome music videos.