<pclass="lead">Bootstrap has a few easy ways to quickly get started, each one appealing to a different skill level and use case. Read through to see what suits your particular needs.</p>
<divclass="row bs-downloads">
<divclass="col-sm-4">
<h3id="download-bootstrap">Bootstrap</h3>
<p>Compiled and minified CSS, JavaScript, and fonts. No docs or original source files are included.</p>
<p>Source Less, JavaScript, and font files, along with our docs. <strong>Requires a Less compiler and <ahref="{{ site.repo }}#compiling-css-and-javascript">some setup.</a></strong></p>
<p>The folks over at <ahref="http://www.maxcdn.com/">MaxCDN</a> graciously provide CDN support for Bootstrap's CSS and JavaScript. Just use these <ahref="http://www.bootstrapcdn.com/">Bootstrap CDN</a> links.</p>
<pclass="lead">Bootstrap is downloadable in two forms, within which you'll find the following directories and files, logically grouping common resources and providing both compiled and minified variations.</p>
<p>Please note that <strong>all JavaScript plugins require jQuery</strong> to be included, as shown in the <ahref="#template">starter template</a>. <ahref="{{ site.repo }}/blob/v{{ site.current_version }}/bower.json">Consult our <code>bower.json</code></a> to see which versions of jQuery are supported.</p>
<p>This is the most basic form of Bootstrap: precompiled files for quick drop-in usage in nearly any web project. We provide compiled CSS and JS (<code>bootstrap.*</code>), as well as compiled and minified CSS and JS (<code>bootstrap.min.*</code>). Fonts from Glyphicons are included, as is the optional Bootstrap theme.</p>
<p>The Bootstrap source code download includes the precompiled CSS, JavaScript, and font assets, along with source Less, JavaScript, and documentation. More specifically, it includes the following and more:</p>
<p>The <code>less/</code>, <code>js/</code>, and <code>fonts/</code> are the source code for our CSS, JS, and icon fonts (respectively). The <code>dist/</code> folder includes everything listed in the precompiled download section above. The <code>docs/</code> folder includes the source code for our documentation, and <code>examples/</code> of Bootstrap usage. Beyond that, any other included file provides support for packages, license information, and development.</p>
<pclass="lead">Start with this basic HTML template, or modify <ahref="#examples">these examples</a>. We hope you'll customize our templates and examples, adapting them to suit your needs.</p>
<p>Copy the HTML below to begin working with a minimal Bootstrap document.</p>
<pclass="lead">Build on the basic template above with Bootstrap's many components. See also <ahref="#customizing">Customizing Bootstrap</a> for tips on maintaining your own Bootstrap variants.</p>
<h3id="examples-framework">Using the framework</h3>
<pclass="lead">Stay up to date on the development of Bootstrap and reach out to the community with these helpful resources.</p>
<ul>
<li>Read and subscribe to <ahref="http://blog.getbootstrap.com/">The Official Bootstrap Blog</a>.</li>
<li>Chat with fellow Bootstrappers using IRC in the <code>irc.freenode.net</code> server, in the <ahref="irc://irc.freenode.net/#twitter-bootstrap">##twitter-bootstrap channel</a>.</li>
<li>For help using Bootstrap, ask on <ahref="http://stackoverflow.com/questions/tagged/twitter-bootstrap-3">StackOverflow using the tag <code>twitter-bootstrap-3</code></a>.</li>
<pclass="lead">Bootstrap automatically adapts your pages for various screen sizes.
Here's how to disable this feature so your page works like in <ahref="../examples/non-responsive/">this non-responsive example</a>.</p>
<h3>Steps to disable page responsiveness</h3>
<ol>
<li>Omit the viewport <code><meta></code> mentioned in <ahref="../css/#overview-mobile">the CSS docs</a></li>
<li>Override the <code>width</code> on the <code>.container</code> for each grid tier with a single width, for example <code>width: 970px !important;</code> Be sure that this comes after the default Bootstrap CSS. You can optionally avoid the <code>!important</code> with media queries or some selector-fu.</li>
<li>If using navbars, remove all navbar collapsing and expanding behavior.</li>
<li>For grid layouts, use <code>.col-xs-*</code> classes in addition to, or in place of, the medium/large ones. Don't worry, the extra-small device grid scales to all resolutions.</li>
</ol>
<p>You'll still need Respond.js for IE8 (since our media queries are still there and need to be processed).
This disables the "mobile site" aspects of Bootstrap.</p>
<h3>Bootstrap template with responsiveness disabled</h3>
<p>We've applied these steps to an example. Read its source code to see the specific changes implemented.</p>
<h1id="support"class="page-header">Browser and device support</h1>
<pclass="lead">Bootstrap is built to work best in the latest desktop and mobile browsers, meaning older browsers might display differently styled, though fully functional, renderings of certain components.</p>
<p>Specifically, we support the <strong>latest versions</strong> of the following browsers and platforms. On Windows, <strong>we support Internet Explorer 8-11</strong>. More specific support information is provided below.</p>
<p>Unofficially, Bootstrap should look and behave well enough in Chromium and Chrome for Linux, Firefox for Linux, and Internet Explorer 7, though they are not officially supported.</p>
<h3id="support-ie8-ie9">Internet Explorer 8 and 9</h3>
<p>Internet Explorer 8 and 9 are also supported, however, please be aware that some CSS3 properties and HTML5 elements are not fully supported by these browsers. In addition, <strong>Internet Explorer 8 requires the use of <ahref="https://github.com/scottjehl/Respond">Respond.js</a> to enable media query support.</strong></p>
<divclass="table-responsive">
<tableclass="table table-bordered table-striped">
<thead>
<tr>
<thscope="col"class="col-xs-4">Feature</th>
<thscope="col"class="col-xs-4">Internet Explorer 8</th>
<thscope="col"class="col-xs-4">Internet Explorer 9</th>
</tr>
</thead>
<tbody>
<tr>
<thscope="row"><code>border-radius</code></th>
<tdclass="text-danger"><spanclass="glyphicon glyphicon-remove"></span> Not supported</td>
<h3id="support-ie8-respondjs">Internet Explorer 8 and Respond.js</h3>
<p>Beware of the following caveats when using Respond.js in your development and production environments for Internet Explorer 8.</p>
<h4id="respond-js-x-domain">Respond.js and cross-domain CSS</h4>
<p>Using Respond.js with CSS hosted on a different (sub)domain (for example, on a CDN) requires some additional setup. <ahref="https://github.com/scottjehl/Respond/blob/master/README.md#cdnx-domain-setup">See the Respond.js docs</a> for details.</p>
<h4id="respond-file-proto">Respond.js and <code>file://</code></h4>
<p>Due to browser security rules, Respond.js doesn't work with pages viewed via the <code>file://</code> protocol (like when opening a local HTML file). To test responsive features in IE8, view your pages over HTTP(S). <ahref="https://github.com/scottjehl/Respond/blob/master/README.md#support--caveats">See the Respond.js docs</a> for details.</p>
<h4id="respond-import">Respond.js and <code>@import</code></h4>
<p>Respond.js doesn't work with CSS that's referenced via <code>@import</code>. In particular, some Drupal configurations are known to use <code>@import</code>. <ahref="https://github.com/scottjehl/Respond/blob/master/README.md#support--caveats">See the Respond.js docs</a> for details.</p>
<h3id="support-ie8-box-sizing">Internet Explorer 8 and box-sizing</h3>
<p>IE8 does not fully support <code>box-sizing: border-box;</code> when combined with <code>min-width</code>, <code>max-width</code>, <code>min-height</code>, or <code>max-height</code>. For that reason, as of v3.0.1, we no longer use <code>max-width</code> on <code>.container</code>s.</p>
<p>Bootstrap is not supported in the old Internet Explorer compatibility modes. To be sure you're using the latest rendering mode for IE, consider including the appropriate <code><meta></code> tag in your pages:</p>
<p>Confirm the document mode by opening the debugging tools: press <kbd>F12</kbd> and check the "Document Mode".</p>
<p>This tag is included in all Bootstrap's documentation and examples to ensure the best rendering possible in each supported version of Internet Explorer.</p>
<p>See <ahref="http://stackoverflow.com/questions/6771258/whats-the-difference-if-meta-http-equiv-x-ua-compatible-content-ie-edge">this StackOverflow question</a> for more information.</p>
<h3id="support-ie10-width">Internet Explorer 10 in Windows 8 and Windows Phone 8</h3>
<p>Internet Explorer 10 doesn't differentiate <strong>device width</strong> from <strong>viewport width</strong>, 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:</p>
<p>However, this doesn't work for devices running Windows Phone 8 versions older than <ahref="http://blogs.windows.com/windows_phone/b/wpdev/archive/2013/10/14/introducing-windows-phone-preview-for-developers.aspx">Update 3 (a.k.a. GDR3)</a>, as it causes such devices to show a mostly desktop view instead of narrow "phone" view. To address this, you'll need to <strong>include the following CSS and JavaScript to work around the bug</strong>.</p>
<p>For more information and usage guidelines, read <ahref="http://timkadlec.com/2013/01/windows-phone-8-and-device-width/">Windows Phone 8 and Device-Width</a>.</p>
<p>As a heads up, we include this in the Bootstrap docs as an example.</p>
<p>As of Safari v6.1 for OS X and Safari for iOS v7.0.1, Safari's rendering engine has some trouble with the number of decimal places used in our <code>.col-*-1</code> grid classes. So if you have 12 individual grid columns, you'll notice that they come up short compared to other rows of columns. We can't do much here (<ahref="https://github.com/twbs/bootstrap/issues/9282">see #9282</a>) but you do have some options:</p>
<ul>
<li>Add <code>.pull-right</code> to your last grid column to get the hard-right alignment</li>
<li>Tweak your percentages manually to get the perfect rounding for Safari (more difficult than the first option)</li>
</ul>
<p>We'll keep an eye on this though and update our code if we have an easy solution.</p>
<h3id="support-fixed-position-keyboards">Modals, navbars, and virtual keyboards</h3>
<h4>Overflow and scrolling</h4>
<p>Support for <code>overflow: hidden</code> on the <code><body></code> element is quite limited in iOS and Android. To that end, when you scroll past the top or bottom of a modal in either of those devices' browsers, the <code><body></code> content will begin to scroll.</p>
<h4>Virtual keyboards</h4>
<p>Also, note that if you're using inputs in your modal or navbar, 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 <code>position: absolute</code> 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.</p>
<h4>Navbar Dropdowns</h4>
<p>The <code>.dropdown-backdrop</code> element isn't used on iOS in the nav because of the complexity of z-indexing. 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).</p>
<p>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.</p>
<p>Even in some modern browsers, printing can be quirky. 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. <ahref="https://github.com/twbs/bootstrap/issues/12078">See #12078 for some details.</a> Suggested workarounds:</p>
<ul>
<li>Embrace the extra-small grid and make sure your page looks acceptable under it.</li>
<li>Customize the values of the <code>@screen-*</code> Less variables so that your printer paper is considered larger than extra-small.</li>
<li>Add custom media queries to change the grid size breakpoints for print media only.</li>
<p>Out of the box, Android 4.1 (and even some newer releases apparently) ship with the Browser app as the default web browser of choice (as opposed to Chrome). Unfortunately, the Browser app has lots of bugs and inconsistencies with CSS in general.</p>
<p>On <code><select></code> elements, the Android stock browser will not display the side controls if there is a <code>border-radius</code> and/or <code>border</code> applied. Use the snippet of code below to remove the offending CSS and render the <code><select></code> as an unstyled element on the Android stock browser. The user agent sniffing avoids interference with Chrome, Safari, and Mozilla browsers.</p>
<h1id="third-parties"class="page-header">Third party support</h1>
<pclass="lead">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.</p>
<p>Some third party software, including Google Maps and Google Custom Search Engine, conflict with Bootstrap due to <code>* { box-sizing: border-box; }</code>, a rule which makes it so <code>padding</code> does not affect the final computed width of an element. Learn more about <ahref="http://css-tricks.com/box-sizing/">box model and sizing at CSS Tricks</a>.</p>
<p>Depending on the context, you may override as-needed (Option 1) or reset the box-sizing for entire regions (Option 2).</p>
<pclass="lead">Bootstrap follows common web standards and—with minimal extra effort—can be used to create sites that are accessible to those using <abbrtitle="Assistive Technology"class="initialism">AT</abbr>.</p>
<p>If your navigation contains many links and comes before the main content in the DOM, add a <code>Skip to main content</code> link immediately after your opening <code><body></code> tag. <ahref="http://a11yproject.com/posts/skip-nav-links/">(read why)</a></p>
<p>When nesting headings (<code><h1></code> - <code><h6></code>), your primary document header should be an <code><h1></code>. Subsequent headings should make logical use of <code><h2></code> - <code><h6></code> such that screen readers can construct a table of contents for your pages.</p>
<p>Learn more at <ahref="http://squizlabs.github.io/HTML_CodeSniffer/Standards/Section508/">HTML CodeSniffer</a> and <ahref="http://accessibility.psu.edu/headings">Penn State's AccessAbility</a>.</p>
<h3>Additional resources</h3>
<ul>
<li><ahref="https://github.com/squizlabs/HTML_CodeSniffer">"HTML Codesniffer" bookmarklet for identifying accessibility issues</a></li>
<pclass="lead">Bootstrap is released under the MIT license and is copyright {{ site.time | date: "%Y" }} Twitter. Boiled down to smaller chunks, it can be described with the following conditions.</p>
<h4>It requires you to:</h4>
<ul>
<li>Include the license and copyright notice in your works</li>
</ul>
<h4>It permits you to:</h4>
<ul>
<li>Freely download and use Bootstrap, in whole or in part, for personal, private, company internal, or commercial purposes</li>
<li>Use Bootstrap in packages or distributions that you create</li>
<li>Modify the source code</li>
<li>Grant a sublicense to modify and distribute Bootstrap to third parties not included in the license</li>
</ul>
<h4>It forbids you to:</h4>
<ul>
<li>Hold the authors and license owners liable for damages as Bootstrap is provided without warranty</li>
<li>Hold the creators or copyright holders of Bootstrap liable</li>
<li>Redistribute any piece of Bootstrap without proper attribution</li>
<li>Use any marks owned by Twitter in any way that might state or imply that Twitter endorses your distribution</li>
<li>Use any marks owned by Twitter in any way that might state or imply that you created the Twitter software in question</li>
</ul>
<h4>It does not require you to:</h4>
<ul>
<li>Include the source of Bootstrap itself, or of any modifications you may have made to it, in any redistribution you may assemble that includes it</li>
<li>Submit changes that you make to Bootstrap back to the Bootstrap project (though such feedback is encouraged)</li>
</ul>
<p>The full Bootstrap license is located <ahref="{{ site.repo }}/blob/master/LICENSE">in the project repository</a> for more information.</p>
<pclass="lead">Bootstrap is best maintained when you treat it as a separate and independently-versioned dependency in your development environment. Doing this makes upgrading Bootstrap easier in the future.</p>
<p>Once you've downloaded and included Bootstrap's styles and scripts, you can customize its components. Just create a new stylesheet (Less, if you like, or just plain CSS) to house your customizations.</p>
<p>Unless you plan on reading the CSS, go with minified stylesheets. It's the same code, just compacted. Minified styles use less bandwidth, which is good, especially in production environments.</p>
<p>You can customize components to varying degrees, but most fall into two camps: <em>light customizations</em> and <em>overhauls</em>. Plenty examples of both are available from third parties.</p>
<p>We define <em>light customizations</em> as superficial changes, for example, color and font changes to existing Bootstrap components. A light customization example is the <ahref="http://translate.twitter.com">Twitter Translation Center</a> (coded by <ahref="https://twitter.com/mdo">@mdo</a>). Let's look at how to implement the custom button we wrote for this site, <code>.btn-ttc</code>.</p>
<p>The stock Bootstrap buttons require just one class, <code>.btn</code>, to start. Here we extend the <code>.btn</code> style with a new modifier class, <code>.btn-ttc</code>, that we will create. This gives us a distinct custom look with minimal effort.</p>
<p>Our customized button will be coded like this:</p>
<p>In short: Look to the style source and duplicate the selectors you need for your modifications.</p>
<p><strong>In summary, here's the basic workflow:</strong></p>
<ul>
<li>For each element you want to customize, find its code in the compiled Bootstrap CSS.</li>
<li>Copy the component's selector and styles and paste them in your custom stylesheet. For instance, to customize the navbar background, just copy the <code>.navbar</code> style specification.</li>
<li>In your custom stylesheet, edit the CSS you just copied from the Bootstrap source. No need for prepending additional classes, or appending <code>!important</code> here. Keep it simple.</li>
<li>Rinse and repeat until you're happy with your customizations.</li>
</ul>
<p>Once you are comfortable performing light customizations, visual overhauls are just as straightforward. For a site like <ahref="http://yourkarma.com">Karma</a>, which uses Bootstrap as a CSS reset with heavy modifications, more extensive work is involved. But the same principle applies: include Bootstrap's default stylesheet first, then apply your custom stylesheet.</p>
<p>While not recommended for folks new to Bootstrap, you may use one of two alternate methods for customization. The first is modifying the source <code>.less</code> files (making upgrades super difficult), and the second is mapping source Less code to <ahref="http://ruby.bvision.com/blog/please-stop-embedding-bootstrap-classes-in-your-html">your own classes via mixins</a>. For the time being, neither of those options are documented here.</p>
<p>Not all sites and applications need to make use of everything Bootstrap has to offer, especially in production environments where optimizing bandwidth is an issue. We encourage you to remove whatever is unused with our <ahref="../customize/">Customizer</a>.</p>
<p>Using the Customizer, simply uncheck any component, feature, or asset you don't need. Hit download and swap out the default Bootstrap files with these newly customized ones. You'll get vanilla Bootstrap, but without the features *you* deem unnecessary. All custom builds include compiled and minified versions, so use whichever works for you.</p>
<pclass="lead">Community members have translated Bootstrap's documentation into various languages. None are officially supported and they may not always be up to date.</p>
<p>Have another language to add, or perhaps a different or better translation? Let us know by <ahref="https://github.com/twbs/bootstrap/issues/new">opening an issue</a>.</p>
