--- layout: docs title: Introduction description: Get started with Bootstrap, the world's most popular framework for building responsive, mobile-first sites, with BootstrapCDN and a template starter page. group: getting-started aliases: - "/docs/4.3/getting-started/" - "/docs/getting-started/" - "/getting-started/" toc: true --- ## 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 `` into your `` 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](https://popper.js.org/). Place the following ` {{< /highlight >}} If you use ` {{< /highlight >}} That's all you need for overall page requirements. Visit the [Layout docs]({{< docsref "/layout/overview" >}}) 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 >}} ... {{< /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 ``. {{< highlight html >}} {{< /highlight >}} You can see an example of this in action in the [starter template](#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](https://css-tricks.com/box-sizing/). ### 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`](https://stackoverflow.com/questions/tagged/bootstrap-4)). - Developers should use the keyword `bootstrap` on packages which modify or add to the functionality of Bootstrap when distributing through [npm](https://www.npmjs.com/search?q=keywords:bootstrap) 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.