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- A set of small, responsive CSS modules that you can use in every web project.
- Do we really need a CSS Framework?
Click on the "Try it Yourself" button to see how it works. Try it Yourself.
- HTML5 Boilerplate: The web’s most popular front-end template;
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Hovering over the page body will show some of the icons and hovering over the remaining icons will show those as well. See issue for details. Bootstrap is not supported in the old Internet Explorer compatibility modes. Confirm the document mode by opening the debugging tools: press F12 and check the "Document Mode". This tag is included in all of Bootstrap's documentation and examples to ensure the best rendering possible in each supported version of Internet Explorer.
See this StackOverflow question for more information. Internet Explorer 10 doesn't differentiate device width from viewport width , and thus doesn't properly apply the media queries in Bootstrap's CSS.
Normally you'd just add a quick snippet of CSS to fix this:. However, this doesn't work for devices running Windows Phone 8 versions older than Update 3 a. GDR3 , as it causes such devices to show a mostly desktop view instead of narrow "phone" view. For more information and usage guidelines, read Windows Phone 8 and Device-Width.
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As a heads up, we include this in all of Bootstrap's documentation and examples as a demonstration. The rendering engine of versions of Safari prior to v7. So if you had 12 individual grid columns, you'd notice that they came up short compared to other rows of columns. See Chrome bug fixed in Chrome v40 and WebKit bug As of iOS 9.
See WebKit bug Also, note that if you're using a fixed navbar or using inputs within a modal, iOS has a rendering bug that doesn't update the position of fixed elements when the virtual keyboard is triggered. A few workarounds for this include transforming your elements to position: absolute or invoking a timer on focus to try to correct the positioning manually. This is not handled by Bootstrap, so it is up to you to decide which solution is best for your application.
Thus, to close dropdowns in navbars, you must directly click the dropdown element or any other element which will fire a click event in iOS. Page zooming inevitably presents rendering artifacts in some components, both in Bootstrap and the rest of the web.
Depending on the issue, we may be able to fix it search first and then open an issue if need be. However, we tend to ignore these as they often have no direct solution other than hacky workarounds. Even though real hovering isn't possible on most touchscreens, most mobile browsers emulate hovering support and make :hover "sticky". In other words, :hover styles start applying after tapping an element and only stop applying after the user taps some other element.
This can cause Bootstrap's :hover states to become undesirably "stuck" on such browsers. Some mobile browsers also make :focus similarly sticky. There is currently no simple workaround for these issues other than removing such styles entirely. In particular, as of Chrome v32 and regardless of margin settings, Chrome uses a viewport width significantly narrower than the physical paper size when resolving media queries while printing a webpage.
This can result in Bootstrap's extra-small grid being unexpectedly activated when printing. See issue and Chrome bug for some details. Suggested workarounds:. Also, as of Safari v8. See and WebKit bug for more details. One potential workaround for this is adding the following CSS:.
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Out of the box, Android 4. Unfortunately, the Browser app has lots of bugs and inconsistencies with CSS in general.
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See this StackOverflow question for details. The user agent sniffing avoids interference with Chrome, Safari, and Mozilla browsers. In order to provide the best possible experience to old and buggy browsers, Bootstrap uses CSS browser hacks in several places to target special CSS to certain browser versions in order to work around bugs in the browsers themselves.
These hacks understandably cause CSS validators to complain that they are invalid. In a couple places, we also use bleeding-edge CSS features that aren't yet fully standardized, but these are used purely for progressive enhancement. These validation warnings don't matter in practice since the non-hacky portion of our CSS does fully validate and the hacky portions don't interfere with the proper functioning of the non-hacky portion, hence why we deliberately ignore these particular warnings.
While we don't officially support any third party plugins or add-ons, we do offer some useful advice to help avoid potential issues in your projects.
Bootstrap 4 Tutorial
Learn more about box model and sizing at CSS Tricks. Depending on the context, you may override as-needed Option 1 or reset the box-sizing for entire regions Option 2. Bootstrap follows common web standards and—with minimal extra effort—can be used to create sites that are accessible to those using AT. If your navigation contains many links and comes before the main content in the DOM, add a Skip to main content link before the navigation for a simple explanation, see this A11Y Project article on skip navigation links.
A set of small, responsive CSS modules that you can use in every web project.
Using the. Note that this bug will also affect any other in-page links your site may be using, rendering them useless for keyboard users. Currently, some of the default color combinations available in Bootstrap such as the various styled button classes, some of the code highlighting colors used for basic code blocks , the. This can cause problems to users with low vision or who are color blind.
These default colors may need to be modified to increase their contrast and legibility. Bootstrap is released under the MIT license and is copyright Twitter. Boiled down to smaller chunks, it can be described with the following conditions. The full Bootstrap license is located in the project repository for more information.
Installing Grunt To install Grunt, you must first download and install node. Then, from the command line: Install grunt-cli globally with npm install -g grunt-cli. When completed, you'll be able to run the various Grunt commands provided from the command line.
Examples Build on the basic template above with Bootstrap's many components. Bootstrap theme Load the optional Bootstrap theme for a visually enhanced experience.
Do we really need a CSS Framework?
Grids Multiple examples of grid layouts with all four tiers, nesting, and more. Jumbotron Build around the jumbotron with a navbar and some basic grid columns. Narrow jumbotron Build a more custom page by narrowing the default container and jumbotron. Navbar Super basic template that includes the navbar along with some additional content. Static top navbar Super basic template with a static top navbar along with some additional content. Fixed navbar Super basic template with a fixed top navbar along with some additional content.
Cover A one-page template for building simple and beautiful home pages.