mirror of
https://github.com/twbs/bootstrap.git
synced 2025-01-23 15:52:21 +01:00
657 lines
38 KiB
HTML
657 lines
38 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<meta name="description" content="Get started with Bootstrap, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page.">
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<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
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<meta name="generator" content="Jekyll v4.1.1">
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<meta name="docsearch:language" content="en">
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<meta name="docsearch:version" content="4.5">
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<title>Introduction · Bootstrap v4.5</title>
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<link rel="canonical" href="https://getbootstrap.com/docs/4.5/getting-started/introduction/">
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<!-- Bootstrap core CSS -->
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<link href="/docs/4.5/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
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<!-- Documentation extras -->
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<link href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" rel="stylesheet">
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<link href="/docs/4.5/assets/css/docs.min.css" rel="stylesheet">
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<!-- Favicons -->
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<link rel="apple-touch-icon" href="/docs/4.5/assets/img/favicons/apple-touch-icon.png" sizes="180x180">
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<link rel="icon" href="/docs/4.5/assets/img/favicons/favicon-32x32.png" sizes="32x32" type="image/png">
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<link rel="icon" href="/docs/4.5/assets/img/favicons/favicon-16x16.png" sizes="16x16" type="image/png">
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<link rel="manifest" href="/docs/4.5/assets/img/favicons/manifest.json">
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<link rel="mask-icon" href="/docs/4.5/assets/img/favicons/safari-pinned-tab.svg" color="#563d7c">
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<link rel="icon" href="/docs/4.5/assets/img/favicons/favicon.ico">
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<meta name="msapplication-config" content="/docs/4.5/assets/img/favicons/browserconfig.xml">
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<meta name="theme-color" content="#563d7c">
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<!-- Twitter -->
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<meta name="twitter:card" content="summary">
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<meta name="twitter:site" content="@getbootstrap">
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<meta name="twitter:creator" content="@getbootstrap">
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<meta name="twitter:title" content="Introduction">
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<meta name="twitter:description" content="Get started with Bootstrap, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page.">
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<meta name="twitter:image" content="https://getbootstrap.com/docs/4.5/assets/brand/bootstrap-social-logo.png">
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<!-- Facebook -->
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<meta property="og:url" content="https://getbootstrap.com/docs/4.5/getting-started/introduction/">
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<meta property="og:title" content="Introduction">
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<meta property="og:description" content="Get started with Bootstrap, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page.">
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<meta property="og:type" content="website">
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<meta property="og:image" content="https://getbootstrap.com/docs/4.5/assets/brand/bootstrap-social.png">
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<meta property="og:image:type" content="image/png">
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<meta property="og:image:width" content="1200">
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<meta property="og:image:height" content="630">
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<script>
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window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
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ga('create', 'UA-146052-10', 'getbootstrap.com');
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ga('set', 'anonymizeIp', true);
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ga('send', 'pageview');
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</script>
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<script async src="https://www.google-analytics.com/analytics.js"></script>
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</head>
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<body>
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<div class="skippy overflow-hidden">
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<div class="container-xl">
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<a class="sr-only sr-only-focusable d-inline-flex p-2 m-1" href="#content">Skip to main content</a><a class="sr-only sr-only-focusable d-none d-md-inline-flex p-2 m-1" href="#bd-docs-nav">Skip to docs navigation</a></div>
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</div>
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<header class="navbar navbar-expand navbar-dark flex-column flex-md-row bd-navbar">
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<a class="navbar-brand mr-0 mr-md-2" href="/" aria-label="Bootstrap"><svg xmlns="http://www.w3.org/2000/svg" width="36" height="36" class="d-block" viewBox="0 0 612 612" role="img" focusable="false"><title>Bootstrap</title><path fill="currentColor" d="M510 8a94.3 94.3 0 0 1 94 94v408a94.3 94.3 0 0 1-94 94H102a94.3 94.3 0 0 1-94-94V102a94.3 94.3 0 0 1 94-94h408m0-8H102C45.9 0 0 45.9 0 102v408c0 56.1 45.9 102 102 102h408c56.1 0 102-45.9 102-102V102C612 45.9 566.1 0 510 0z"/><path fill="currentColor" d="M196.77 471.5V154.43h124.15c54.27 0 91 31.64 91 79.1 0 33-24.17 63.72-54.71 69.21v1.76c43.07 5.49 70.75 35.82 70.75 78 0 55.81-40 89-107.45 89zm39.55-180.4h63.28c46.8 0 72.29-18.68 72.29-53 0-31.42-21.53-48.78-60-48.78h-75.57zm78.22 145.46c47.68 0 72.73-19.34 72.73-56s-25.93-55.37-76.46-55.37h-74.49v111.4z"/></svg></a>
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<div class="navbar-nav-scroll">
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<ul class="navbar-nav bd-navbar-nav flex-row">
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<li class="nav-item">
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<a class="nav-link " href="/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Bootstrap');">Home</a>
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</li>
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<li class="nav-item">
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<a class="nav-link active" href="/docs/4.5/getting-started/introduction/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Docs');">Documentation</a>
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</li>
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<li class="nav-item">
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<a class="nav-link " href="/docs/4.5/examples/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Examples');">Examples</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="https://icons.getbootstrap.com/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Icons');" target="_blank" rel="noopener">Icons</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="https://themes.getbootstrap.com/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Themes');" target="_blank" rel="noopener">Themes</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="https://expo.getbootstrap.com/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Expo');" target="_blank" rel="noopener">Expo</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="https://blog.getbootstrap.com/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Blog');" target="_blank" rel="noopener">Blog</a>
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</li>
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</ul>
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</div>
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<ul class="navbar-nav ml-md-auto">
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<li class="nav-item dropdown">
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<a class="nav-item nav-link dropdown-toggle mr-md-2" href="#" id="bd-versions" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
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v4.5
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</a>
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<div class="dropdown-menu dropdown-menu-md-right" aria-labelledby="bd-versions">
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<a class="dropdown-item active" href="/docs/4.5/">Latest (4.5.x)</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="https://getbootstrap.com/docs/3.4/">v3.4.1</a>
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<a class="dropdown-item" href="https://getbootstrap.com/2.3.2/">v2.3.2</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="/docs/versions/">All versions</a>
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</div>
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</li>
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<li class="nav-item">
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<a class="nav-link pl-2 pr-1 mx-1 py-3 my-n2" href="https://github.com/twbs" target="_blank" rel="noopener" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 499.36" role="img" focusable="false"><title>GitHub</title><path fill="currentColor" fill-rule="evenodd" d="M256 0C114.64 0 0 114.61 0 256c0 113.09 73.34 209 175.08 242.9 12.8 2.35 17.47-5.56 17.47-12.34 0-6.08-.22-22.18-.35-43.54-71.2 15.49-86.2-34.34-86.2-34.34-11.64-29.57-28.42-37.45-28.42-37.45-23.27-15.84 1.73-15.55 1.73-15.55 25.69 1.81 39.21 26.38 39.21 26.38 22.84 39.12 59.92 27.82 74.5 21.27 2.33-16.54 8.94-27.82 16.25-34.22-56.84-6.43-116.6-28.43-116.6-126.49 0-27.95 10-50.8 26.35-68.69-2.63-6.48-11.42-32.5 2.51-67.75 0 0 21.49-6.88 70.4 26.24a242.65 242.65 0 0 1 128.18 0c48.87-33.13 70.33-26.24 70.33-26.24 14 35.25 5.18 61.27 2.55 67.75 16.41 17.9 26.31 40.75 26.31 68.69 0 98.35-59.85 120-116.88 126.32 9.19 7.9 17.38 23.53 17.38 47.41 0 34.22-.31 61.83-.31 70.23 0 6.85 4.61 14.81 17.6 12.31C438.72 464.97 512 369.08 512 256.02 512 114.62 397.37 0 256 0z"/></svg></a>
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</li>
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<li class="nav-item">
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<a class="nav-link px-1 mx-1 py-3 my-n2" href="https://twitter.com/getbootstrap" target="_blank" rel="noopener" aria-label="Twitter"><svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 416.32" role="img" focusable="false"><title>Twitter</title><path fill="currentColor" d="M160.83 416.32c193.2 0 298.92-160.22 298.92-298.92 0-4.51 0-9-.2-13.52A214 214 0 0 0 512 49.38a212.93 212.93 0 0 1-60.44 16.6 105.7 105.7 0 0 0 46.3-58.19 209 209 0 0 1-66.79 25.37 105.09 105.09 0 0 0-181.73 71.91 116.12 116.12 0 0 0 2.66 24c-87.28-4.3-164.73-46.3-216.56-109.82A105.48 105.48 0 0 0 68 159.6a106.27 106.27 0 0 1-47.53-13.11v1.43a105.28 105.28 0 0 0 84.21 103.06 105.67 105.67 0 0 1-47.33 1.84 105.06 105.06 0 0 0 98.14 72.94A210.72 210.72 0 0 1 25 370.84a202.17 202.17 0 0 1-25-1.43 298.85 298.85 0 0 0 160.83 46.92"/></svg></a>
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</li>
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<li class="nav-item">
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<a class="nav-link px-1 mx-1 py-3 my-n2" href="https://bootstrap-slack.herokuapp.com/" target="_blank" rel="noopener" aria-label="Slack"><svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 512" role="img" focusable="false"><title>Slack</title><path fill="currentColor" d="M210.787 234.832l68.31-22.883 22.1 65.977-68.309 22.882z"/><path fill="currentColor" d="M490.54 185.6C437.7 9.59 361.6-31.34 185.6 21.46S-31.3 150.4 21.46 326.4 150.4 543.3 326.4 490.54 543.34 361.6 490.54 185.6zM401.7 299.8l-33.15 11.05 11.46 34.38c4.5 13.92-2.87 29.06-16.78 33.56-2.87.82-6.14 1.64-9 1.23a27.32 27.32 0 0 1-24.56-18l-11.46-34.38-68.36 22.92 11.46 34.38c4.5 13.92-2.87 29.06-16.78 33.56-2.87.82-6.14 1.64-9 1.23a27.32 27.32 0 0 1-24.56-18l-11.46-34.43-33.15 11.05c-2.87.82-6.14 1.64-9 1.23a27.32 27.32 0 0 1-24.56-18c-4.5-13.92 2.87-29.06 16.78-33.56l33.12-11.03-22.1-65.9-33.15 11.05c-2.87.82-6.14 1.64-9 1.23a27.32 27.32 0 0 1-24.56-18c-4.48-13.93 2.89-29.07 16.81-33.58l33.15-11.05-11.46-34.38c-4.5-13.92 2.87-29.06 16.78-33.56s29.06 2.87 33.56 16.78l11.46 34.38 68.36-22.92-11.46-34.38c-4.5-13.92 2.87-29.06 16.78-33.56s29.06 2.87 33.56 16.78l11.47 34.42 33.15-11.05c13.92-4.5 29.06 2.87 33.56 16.78s-2.87 29.06-16.78 33.56L329.7 194.6l22.1 65.9 33.15-11.05c13.92-4.5 29.06 2.87 33.56 16.78s-2.88 29.07-16.81 33.57z"/></svg></a>
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</li>
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<li class="nav-item">
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<a class="nav-link px-1 mx-1 py-3 my-n2" href="https://opencollective.com/bootstrap/" target="_blank" rel="noopener" aria-label="Open Collective"><svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" fill-rule="evenodd" class="navbar-nav-svg" viewBox="0 0 40 41" role="img" focusable="false"><title>Open Collective</title><path fill-opacity=".4" d="M32.8 21c0 2.4-.8 4.9-2 6.9l5.1 5.1c2.5-3.4 4.1-7.6 4.1-12 0-4.6-1.6-8.8-4-12.2L30.7 14c1.2 2 2 4.3 2 7z"/><path d="M20 33.7a12.8 12.8 0 0 1 0-25.6c2.6 0 5 .7 7 2.1L32 5a20 20 0 1 0 .1 31.9l-5-5.2a13 13 0 0 1-7 2z"/></svg></a>
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</li>
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</ul>
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<a class="btn btn-bd-download d-none d-lg-inline-block mb-3 mb-md-0 ml-md-3" href="/docs/4.5/getting-started/download/">Download</a>
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</header>
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<div class="container-fluid">
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<div class="row flex-xl-nowrap">
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<div class="col-md-3 col-xl-2 bd-sidebar">
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<form role="search" class="bd-search d-flex align-items-center">
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<input type="search" class="form-control" id="search-input" placeholder="Search..." aria-label="Search for..." autocomplete="off" data-docs-version="4.5">
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<button class="btn bd-search-docs-toggle d-md-none p-0 ml-3" type="button" data-toggle="collapse" data-target="#bd-docs-nav" aria-controls="bd-docs-nav" aria-expanded="false" aria-label="Toggle docs navigation"><svg xmlns="http://www.w3.org/2000/svg" width="30" height="30" viewBox="0 0 30 30" role="img" focusable="false"><title>Menu</title><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"/></svg></button>
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</form>
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<nav class="collapse bd-links" id="bd-docs-nav" aria-label="Main navigation"><div class="bd-toc-item active">
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<a class="bd-toc-link" href="/docs/4.5/getting-started/introduction/">
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Getting started
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</a>
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<ul class="nav bd-sidenav"><li class="active bd-sidenav-active">
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<a href="/docs/4.5/getting-started/introduction/">
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Introduction
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/download/">
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Download
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/contents/">
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Contents
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/browsers-devices/">
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Browsers & devices
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/javascript/">
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JavaScript
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/theming/">
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Theming
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/build-tools/">
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Build tools
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/webpack/">
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Webpack
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</a>
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</li><li>
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<a href="/docs/4.5/getting-started/accessibility/">
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Accessibility
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</a>
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</li></ul>
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</div><div class="bd-toc-item">
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<a class="bd-toc-link" href="/docs/4.5/layout/overview/">
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Layout
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</a>
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<ul class="nav bd-sidenav"><li>
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<a href="/docs/4.5/layout/overview/">
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Overview
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</a>
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</li><li>
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<a href="/docs/4.5/layout/grid/">
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Grid
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</a>
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</li><li>
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<a href="/docs/4.5/layout/utilities-for-layout/">
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Utilities for layout
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</a>
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</li></ul>
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</div><div class="bd-toc-item">
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<a class="bd-toc-link" href="/docs/4.5/content/reboot/">
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Content
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</a>
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<ul class="nav bd-sidenav"><li>
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<a href="/docs/4.5/content/reboot/">
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Reboot
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</a>
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</li><li>
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<a href="/docs/4.5/content/typography/">
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Typography
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</a>
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</li><li>
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<a href="/docs/4.5/content/code/">
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Code
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</a>
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</li><li>
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<a href="/docs/4.5/content/images/">
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Images
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</a>
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</li><li>
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<a href="/docs/4.5/content/tables/">
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Tables
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</a>
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</li><li>
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<a href="/docs/4.5/content/figures/">
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Figures
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</a>
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</li></ul>
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</div><div class="bd-toc-item">
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<a class="bd-toc-link" href="/docs/4.5/components/alerts/">
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Components
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</a>
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<ul class="nav bd-sidenav"><li>
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<a href="/docs/4.5/components/alerts/">
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Alerts
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</a>
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</li><li>
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<a href="/docs/4.5/components/badge/">
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Badge
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</a>
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</li><li>
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<a href="/docs/4.5/components/breadcrumb/">
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Breadcrumb
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</a>
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</li><li>
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<a href="/docs/4.5/components/buttons/">
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Buttons
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</a>
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</li><li>
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<a href="/docs/4.5/components/button-group/">
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Button group
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</a>
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</li><li>
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<a href="/docs/4.5/components/card/">
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Card
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</a>
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</li><li>
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<a href="/docs/4.5/components/carousel/">
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Carousel
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</a>
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</li><li>
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<a href="/docs/4.5/components/collapse/">
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Collapse
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</a>
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</li><li>
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<a href="/docs/4.5/components/dropdowns/">
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Dropdowns
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</a>
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</li><li>
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<a href="/docs/4.5/components/forms/">
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Forms
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</a>
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</li><li>
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<a href="/docs/4.5/components/input-group/">
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Input group
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</a>
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</li><li>
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<a href="/docs/4.5/components/jumbotron/">
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Jumbotron
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</a>
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</li><li>
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<a href="/docs/4.5/components/list-group/">
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List group
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</a>
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</li><li>
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<a href="/docs/4.5/components/media-object/">
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Media object
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</a>
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</li><li>
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<a href="/docs/4.5/components/modal/">
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Modal
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</a>
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</li><li>
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<a href="/docs/4.5/components/navs/">
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Navs
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</a>
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</li><li>
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<a href="/docs/4.5/components/navbar/">
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Navbar
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</a>
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||
</li><li>
|
||
<a href="/docs/4.5/components/pagination/">
|
||
Pagination
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/components/popovers/">
|
||
Popovers
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/components/progress/">
|
||
Progress
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/components/scrollspy/">
|
||
Scrollspy
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/components/spinners/">
|
||
Spinners
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/components/toasts/">
|
||
Toasts
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/components/tooltips/">
|
||
Tooltips
|
||
</a>
|
||
</li></ul>
|
||
</div><div class="bd-toc-item">
|
||
<a class="bd-toc-link" href="/docs/4.5/utilities/borders/">
|
||
Utilities
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav"><li>
|
||
<a href="/docs/4.5/utilities/borders/">
|
||
Borders
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/clearfix/">
|
||
Clearfix
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/close-icon/">
|
||
Close icon
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/colors/">
|
||
Colors
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/display/">
|
||
Display
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/embed/">
|
||
Embed
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/flex/">
|
||
Flex
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/float/">
|
||
Float
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/image-replacement/">
|
||
Image replacement
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/interactions/">
|
||
Interactions
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/overflow/">
|
||
Overflow
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/position/">
|
||
Position
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/screen-readers/">
|
||
Screen readers
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/shadows/">
|
||
Shadows
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/sizing/">
|
||
Sizing
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/spacing/">
|
||
Spacing
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/stretched-link/">
|
||
Stretched link
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/text/">
|
||
Text
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/vertical-align/">
|
||
Vertical align
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/utilities/visibility/">
|
||
Visibility
|
||
</a>
|
||
</li></ul>
|
||
</div><div class="bd-toc-item">
|
||
<a class="bd-toc-link" href="/docs/4.5/extend/approach/">
|
||
Extend
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav"><li>
|
||
<a href="/docs/4.5/extend/approach/">
|
||
Approach
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/extend/icons/">
|
||
Icons
|
||
</a>
|
||
</li></ul>
|
||
</div><div class="bd-toc-item">
|
||
<a class="bd-toc-link" href="/docs/4.5/migration/">
|
||
Migration
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav"></ul>
|
||
</div><div class="bd-toc-item">
|
||
<a class="bd-toc-link" href="/docs/4.5/about/overview/">
|
||
About
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav"><li>
|
||
<a href="/docs/4.5/about/overview/">
|
||
Overview
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/about/team/">
|
||
Team
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/about/brand/">
|
||
Brand
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/about/license/">
|
||
License
|
||
</a>
|
||
</li><li>
|
||
<a href="/docs/4.5/about/translations/">
|
||
Translations
|
||
</a>
|
||
</li></ul>
|
||
</div></nav>
|
||
|
||
</div>
|
||
|
||
|
||
<nav class="d-none d-xl-block col-xl-2 bd-toc" aria-label="Secondary navigation">
|
||
<ul class="section-nav">
|
||
<li class="toc-entry toc-h2"><a href="#quick-start">Quick start</a>
|
||
<ul>
|
||
<li class="toc-entry toc-h3"><a href="#css">CSS</a></li>
|
||
<li class="toc-entry toc-h3"><a href="#js">JS</a>
|
||
<ul>
|
||
<li class="toc-entry toc-h4"><a href="#bundle">Bundle</a></li>
|
||
<li class="toc-entry toc-h4"><a href="#separate">Separate</a></li>
|
||
<li class="toc-entry toc-h4"><a href="#components">Components</a></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
<li class="toc-entry toc-h2"><a href="#starter-template">Starter template</a></li>
|
||
<li class="toc-entry toc-h2"><a href="#important-globals">Important globals</a>
|
||
<ul>
|
||
<li class="toc-entry toc-h3"><a href="#html5-doctype">HTML5 doctype</a></li>
|
||
<li class="toc-entry toc-h3"><a href="#responsive-meta-tag">Responsive meta tag</a></li>
|
||
<li class="toc-entry toc-h3"><a href="#box-sizing">Box-sizing</a></li>
|
||
<li class="toc-entry toc-h3"><a href="#reboot">Reboot</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toc-entry toc-h2"><a href="#community">Community</a></li>
|
||
</ul>
|
||
</nav>
|
||
|
||
|
||
<main class="col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
|
||
<div class="d-md-flex flex-md-row-reverse align-items-center justify-content-between">
|
||
<a class="btn btn-sm btn-bd-light my-2 my-md-0" href="https://github.com/twbs/bootstrap/blob/v4-dev/site/docs/4.5/getting-started/introduction.md" title="View and edit this file on GitHub" target="_blank" rel="noopener">View on GitHub</a>
|
||
<h1 class="bd-title" id="content">Introduction</h1>
|
||
</div>
|
||
<p class="bd-lead">Get started with Bootstrap, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page.</p>
|
||
<script async src="https://cdn.carbonads.com/carbon.js?serve=CKYIKKJL&placement=getbootstrapcom" id="_carbonads_js"></script>
|
||
|
||
<h2 id="quick-start">Quick start</h2>
|
||
|
||
<p>Looking to quickly add Bootstrap to your project? Use jsDelivr, a free open source CDN. Using a package manager or need to download the source files? <a href="/docs/4.5/getting-started/download/">Head to the downloads page</a>.</p>
|
||
|
||
<h3 id="css">CSS</h3>
|
||
|
||
<p>Copy-paste the stylesheet <code class="language-plaintext highlighter-rouge"><link></code> into your <code class="language-plaintext highlighter-rouge"><head></code> before all other stylesheets to load our CSS.</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><link</span> <span class="na">rel=</span><span class="s">"stylesheet"</span> <span class="na">href=</span><span class="s">"https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css"</span> <span class="na">integrity=</span><span class="s">"sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></span></code></pre></figure>
|
||
|
||
<h3 id="js">JS</h3>
|
||
|
||
<p>Many of our components require the use of JavaScript to function. Specifically, they require <a href="https://jquery.com/">jQuery</a>, <a href="https://popper.js.org/">Popper.js</a>, and our own JavaScript plugins. We use <a href="https://blog.jquery.com/2016/06/09/jquery-3-0-final-released/">jQuery’s slim build</a>, but the full version is also supported.</p>
|
||
|
||
<p>Place <strong>one of the following <code class="language-plaintext highlighter-rouge"><script></code>s</strong> near the end of your pages, right before the closing <code class="language-plaintext highlighter-rouge"></body></code> tag, to enable them. jQuery must come first, then Popper.js, and then our JavaScript plugins.</p>
|
||
|
||
<h4 id="bundle">Bundle</h4>
|
||
|
||
<p>Include everything you need in one script with our bundle. Our <code class="language-plaintext highlighter-rouge">bootstrap.bundle.js</code> and <code class="language-plaintext highlighter-rouge">bootstrap.bundle.min.js</code> include <a href="https://popper.js.org/">Popper</a>, but not <a href="https://jquery.com/">jQuery</a>. For more information about what’s included in Bootstrap, please see our <a href="/docs/4.5/getting-started/contents/#precompiled-bootstrap">contents</a> section.</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><script </span><span class="na">src=</span><span class="s">"https://code.jquery.com/jquery-3.5.1.slim.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></script></span>
|
||
<span class="nt"><script </span><span class="na">src=</span><span class="s">"https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.bundle.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></script></span></code></pre></figure>
|
||
|
||
<h4 id="separate">Separate</h4>
|
||
|
||
<p>If you decide to go with the separate scripts solution, Popper.js must come first, and then our JavaScript plugins.</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><script </span><span class="na">src=</span><span class="s">"https://code.jquery.com/jquery-3.5.1.slim.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></script></span>
|
||
<span class="nt"><script </span><span class="na">src=</span><span class="s">"https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></script></span>
|
||
<span class="nt"><script </span><span class="na">src=</span><span class="s">"https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-w1Q4orYjBQndcko6MimVbzY0tgp4pWB4lZ7lr30WKz0vr/aWKhXdBNmNb5D92v7s"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></script></span></code></pre></figure>
|
||
|
||
<h4 id="components">Components</h4>
|
||
|
||
<p>Curious which components explicitly require jQuery, our JS, and Popper.js? Click the show components link below. If you’re unsure about the page structure, keep reading for an example page template.</p>
|
||
|
||
<details>
|
||
<summary class="text-primary mb-3">Show components requiring JavaScript</summary>
|
||
|
||
|
||
<ul>
|
||
<li>Alerts for dismissing</li>
|
||
<li>Buttons for toggling states and checkbox/radio functionality</li>
|
||
<li>Carousel for all slide behaviors, controls, and indicators</li>
|
||
<li>Collapse for toggling visibility of content</li>
|
||
<li>Dropdowns for displaying and positioning (also requires <a href="https://popper.js.org/">Popper.js</a>)</li>
|
||
<li>Modals for displaying, positioning, and scroll behavior</li>
|
||
<li>Navbar for extending our Collapse plugin to implement responsive behavior</li>
|
||
<li>Toasts for displaying and dismissing</li>
|
||
<li>Tooltips and popovers for displaying and positioning (also requires <a href="https://popper.js.org/">Popper.js</a>)</li>
|
||
<li>Scrollspy for scroll behavior and navigation updates</li>
|
||
</ul>
|
||
|
||
</details>
|
||
|
||
<h2 id="starter-template">Starter template</h2>
|
||
|
||
<p>Be sure to have your pages set up with the latest design and development standards. That means using an HTML5 doctype and including a viewport meta tag for proper responsive behaviors. Put it all together and your pages should look like this:</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="cp"><!doctype html></span>
|
||
<span class="nt"><html</span> <span class="na">lang=</span><span class="s">"en"</span><span class="nt">></span>
|
||
<span class="nt"><head></span>
|
||
<span class="c"><!-- Required meta tags --></span>
|
||
<span class="nt"><meta</span> <span class="na">charset=</span><span class="s">"utf-8"</span><span class="nt">></span>
|
||
<span class="nt"><meta</span> <span class="na">name=</span><span class="s">"viewport"</span> <span class="na">content=</span><span class="s">"width=device-width, initial-scale=1, shrink-to-fit=no"</span><span class="nt">></span>
|
||
|
||
<span class="c"><!-- Bootstrap CSS --></span>
|
||
<span class="nt"><link</span> <span class="na">rel=</span><span class="s">"stylesheet"</span> <span class="na">href=</span><span class="s">"https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css"</span> <span class="na">integrity=</span><span class="s">"sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></span>
|
||
|
||
<span class="nt"><title></span>Hello, world!<span class="nt"></title></span>
|
||
<span class="nt"></head></span>
|
||
<span class="nt"><body></span>
|
||
<span class="nt"><h1></span>Hello, world!<span class="nt"></h1></span>
|
||
|
||
<span class="c"><!-- Optional JavaScript; choose one of the two! --></span>
|
||
|
||
<span class="c"><!-- Option 1: jQuery and Bootstrap Bundle (includes Popper) --></span>
|
||
<span class="nt"><script </span><span class="na">src=</span><span class="s">"https://code.jquery.com/jquery-3.5.1.slim.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></script></span>
|
||
<span class="nt"><script </span><span class="na">src=</span><span class="s">"https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.bundle.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">></script></span>
|
||
|
||
<span class="c"><!-- Option 2: jQuery, Popper.js, and Bootstrap JS
|
||
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
|
||
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
|
||
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.min.js" integrity="sha384-w1Q4orYjBQndcko6MimVbzY0tgp4pWB4lZ7lr30WKz0vr/aWKhXdBNmNb5D92v7s" crossorigin="anonymous"></script>
|
||
--></span>
|
||
<span class="nt"></body></span>
|
||
<span class="nt"></html></span></code></pre></figure>
|
||
|
||
<p>That’s all you need for overall page requirements. Visit the <a href="/docs/4.5/layout/overview/">Layout docs</a> or <a href="/docs/4.5/examples/">our official examples</a> to start laying out your site’s content and components.</p>
|
||
|
||
<h2 id="important-globals">Important globals</h2>
|
||
|
||
<p>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 <em>normalization</em> of cross browser styles. Let’s dive in.</p>
|
||
|
||
<h3 id="html5-doctype">HTML5 doctype</h3>
|
||
|
||
<p>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.</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="cp"><!doctype html></span>
|
||
<span class="nt"><html</span> <span class="na">lang=</span><span class="s">"en"</span><span class="nt">></span>
|
||
...
|
||
<span class="nt"></html></span></code></pre></figure>
|
||
|
||
<h3 id="responsive-meta-tag">Responsive meta tag</h3>
|
||
|
||
<p>Bootstrap is developed <em>mobile first</em>, 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, <strong>add the responsive viewport meta tag</strong> to your <code class="language-plaintext highlighter-rouge"><head></code>.</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><meta</span> <span class="na">name=</span><span class="s">"viewport"</span> <span class="na">content=</span><span class="s">"width=device-width, initial-scale=1, shrink-to-fit=no"</span><span class="nt">></span></code></pre></figure>
|
||
|
||
<p>You can see an example of this in action in the <a href="#starter-template">starter template</a>.</p>
|
||
|
||
<h3 id="box-sizing">Box-sizing</h3>
|
||
|
||
<p>For more straightforward sizing in CSS, we switch the global <code class="language-plaintext highlighter-rouge">box-sizing</code> value from <code class="language-plaintext highlighter-rouge">content-box</code> to <code class="language-plaintext highlighter-rouge">border-box</code>. This ensures <code class="language-plaintext highlighter-rouge">padding</code> 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.</p>
|
||
|
||
<p>On the rare occasion you need to override it, use something like the following:</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-css" data-lang="css"><span class="nc">.selector-for-some-widget</span> <span class="p">{</span>
|
||
<span class="nl">box-sizing</span><span class="p">:</span> <span class="n">content-box</span><span class="p">;</span>
|
||
<span class="p">}</span></code></pre></figure>
|
||
|
||
<p>With the above snippet, nested elements—including generated content via <code class="language-plaintext highlighter-rouge">::before</code> and <code class="language-plaintext highlighter-rouge">::after</code>—will all inherit the specified <code class="language-plaintext highlighter-rouge">box-sizing</code> for that <code class="language-plaintext highlighter-rouge">.selector-for-some-widget</code>.</p>
|
||
|
||
<p>Learn more about <a href="https://css-tricks.com/box-sizing/">box model and sizing at CSS Tricks</a>.</p>
|
||
|
||
<h3 id="reboot">Reboot</h3>
|
||
|
||
<p>For improved cross-browser rendering, we use <a href="/docs/4.5/content/reboot/">Reboot</a> to correct inconsistencies across browsers and devices while providing slightly more opinionated resets to common HTML elements.</p>
|
||
|
||
<h2 id="community">Community</h2>
|
||
|
||
<p>Stay up to date on the development of Bootstrap and reach out to the community with these helpful resources.</p>
|
||
|
||
<ul>
|
||
<li>Follow <a href="https://twitter.com/getbootstrap">@getbootstrap on Twitter</a>.</li>
|
||
<li>Read and subscribe to <a href="https://blog.getbootstrap.com/">The Official Bootstrap Blog</a>.</li>
|
||
<li>Join <a href="https://bootstrap-slack.herokuapp.com/">the official Slack room</a>.</li>
|
||
<li>Chat with fellow Bootstrappers in IRC. On the <code class="language-plaintext highlighter-rouge">irc.freenode.net</code> server, in the <code class="language-plaintext highlighter-rouge">##bootstrap</code> channel.</li>
|
||
<li>Implementation help may be found at Stack Overflow (tagged <a href="https://stackoverflow.com/questions/tagged/bootstrap-4"><code class="language-plaintext highlighter-rouge">bootstrap-4</code></a>).</li>
|
||
<li>Developers should use the keyword <code class="language-plaintext highlighter-rouge">bootstrap</code> on packages which modify or add to the functionality of Bootstrap when distributing through <a href="https://www.npmjs.com/search?q=keywords:bootstrap">npm</a> or similar delivery mechanisms for maximum discoverability.</li>
|
||
</ul>
|
||
|
||
<p>You can also follow <a href="https://twitter.com/getbootstrap">@getbootstrap on Twitter</a> for the latest gossip and awesome music videos.</p>
|
||
|
||
</main>
|
||
</div>
|
||
</div>
|
||
|
||
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|
||
<script>window.jQuery || document.write('<script src="/docs/4.5/assets/js/vendor/jquery.slim.min.js"><\/script>')</script><script src="/docs/4.5/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script><script src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script><script src="/docs/4.5/assets/js/docs.min.js"></script>
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||
</body>
|
||
</html>
|