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testing
Curious which components explicitly require our JavaScript and Popper? 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
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.
...
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 .
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:
.selector-for-some-widget {
box-sizing: content-box;
}
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 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.
Read and subscribe to The Official Bootstrap Blog.
Ask and explore our GitHub Discussions.
Chat with fellow Bootstrappers in IRC. On the irc.libera.chat server, in the #bootstrap channel.
Implementation help may be found at Stack Overflow (tagged bootstrap-5).
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.
You can also follow @getbootstrap on Twitter for the latest gossip and awesome music videos.
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