Get started by including Bootstrap's production-ready CSS and JavaScript via CDN without the need for any build steps. See it in practice with this Bootstrap CodePen demo.
1.Create a newindex.htmlfile in your project root. Include the tag as well forproper responsive behaviorin mobile devices.
2.Bootstrap's CSS and JS.Place the < link> tag in the < head> for our CSS, and the "script" tag for our JavaScript bundle (including Popper for positioning dropdowns, poppers, and tooltips) before the closing
You can also include Popper and our JS separately. If you don’t plan to use dropdowns, popovers, or tooltips, save some kilobytes by not including Popper.
3.Hello, world! Open the page in your browser of choice to see your Bootstrapped page. Now you can start building with Bootstrap by creating your own layout, adding dozens of components, and utilizing our official examples.
4.Looking to use Bootstrap as a module with < script type="module">? Please refer to our using Bootstrap as a module section.
JS components
Curious which components explicitly require our JavaScript and Popper? If you’re at all unsure about the general page structure, keep reading for an example page template.
1.Alerts for dismissing
2.Buttons for toggling states and checkbox/radio functionality
3.Carousel for all slide behaviors, controls, and indicators
4.Collapse for toggling visibility of content
5.Dropdowns for displaying and positioning (also requires Popper)
6.Modals for displaying, positioning, and scroll behavior
7.Navbar for extending our Collapse and Offcanvas plugins to implement responsive behaviors
8.Navs with the Tab plugin for toggling content panes
9.Offcanvases for displaying, positioning, and scroll behavior
10.Scrollspy for scroll behavior and navigation updates
11.Toasts for displaying and dismissing
12.Tooltips and popovers for displaying and positioning (also requires Popper)
Important globals
Bootstrap employs a handful of important global styles and settings, 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 and incomplete styling.
< !doctype html>
< html lang="en">
...
< /html>
Viewport meta
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>.
< meta name="viewport" content="width=device-width, initial-scale=1">
You can see an example of this in action in the quick start.
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:
With the above snippet, nested elements—including generated content via ::before and ::after—will all inherit the specified box-sizingfor that .selector-for-some-widget.
For improved cross-browser rendering, we use 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.
4.Chat with fellow Bootstrappers in IRC. On the irc.libera.chat server, in the #bootstrap channel.
5.Implementation help may be found at Stack Overflow (tagged bootstrap-5).
6.Developers should use the keyword bootstrap on packages that modify or add to the functionality of Bootstrap when distributing through npm or similar delivery mechanisms for maximum discoverability.
