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https://project-rfs.github.io/

html project-rfs.github.io collected 2026-10-03 09:47:17 UTC 22,235 bytes, 232 lines download raw bytes

1<!doctype html>
2<html lang="en">
3  <head>
4    <meta charset="utf-8">
5<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
6<meta name="description" content="The most popular HTML, CSS, and JS library in the world.">
7<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
8<meta name="generator" content="Jekyll v3.8.5">
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10<meta name="docsearch:language" content="en">
11<meta name="docsearch:version" content="4.3">
12
13<title>Bootstrap · The most popular HTML, CSS, and JS library in the world.</title>
14
15<link rel="canonical" href="https://project-rfs.github.io/">
16
17<!-- Bootstrap core CSS -->
18<link href="/docs/4.3/dist/css/bootstrap.css" rel="stylesheet">
19<!-- Documentation extras -->
20
21
22<link href="/docs/4.3/assets/css/docs.min.css" rel="stylesheet">
23
24<!-- Favicons -->
25<link rel="apple-touch-icon" href="/docs/4.3/assets/img/favicons/apple-touch-icon.png" sizes="180x180">
26<link rel="icon" href="/docs/4.3/assets/img/favicons/favicon-32x32.png" sizes="32x32" type="image/png">
27<link rel="icon" href="/docs/4.3/assets/img/favicons/favicon-16x16.png" sizes="16x16" type="image/png">
28<link rel="manifest" href="/docs/4.3/assets/img/favicons/manifest.json">
29<link rel="mask-icon" href="/docs/4.3/assets/img/favicons/safari-pinned-tab.svg" color="#563d7c">
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31<meta name="msapplication-config" content="/docs/4.3/assets/img/favicons/browserconfig.xml">
32<meta name="theme-color" content="#563d7c">
33
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35<meta name="twitter:card" content="summary_large_image">
36<meta name="twitter:site" content="@getbootstrap">
37<meta name="twitter:creator" content="@getbootstrap">
38<meta name="twitter:title" content="Bootstrap">
39<meta name="twitter:description" content="The most popular HTML, CSS, and JS library in the world.">
40<meta name="twitter:image" content="https://project-rfs.github.io/docs/4.3/assets/brand/bootstrap-social.png">
41
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43<meta property="og:url" content="https://project-rfs.github.io/">
44<meta property="og:title" content="Bootstrap">
45<meta property="og:description" content="The most popular HTML, CSS, and JS library in the world.">
46<meta property="og:type" content="website">
47<meta property="og:image" content="http://project-rfs.github.io/docs/4.3/assets/brand/bootstrap-social.png">
48<meta property="og:image:secure_url" content="https://project-rfs.github.io/docs/4.3/assets/brand/bootstrap-social.png">
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51<meta property="og:image:height" content="630">
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55  ga('create', 'UA-146052-10', 'getbootstrap.com');
56  ga('send', 'pageview');
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vendor: 1 bytes, line 57
57
58<script async src="https://www.google-analytics.com/analytics.js"></script>
58
59
60
61  </head>
62  <body>
63    <a class="skippy sr-only sr-only-focusable" href="#content">
64  <span class="skippy-text">Skip to main content</span>
65</a>
66
67
68    <header class="navbar navbar-expand navbar-dark flex-column flex-md-row bd-navbar">
69  <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>
70
71  <div class="navbar-nav-scroll">
72    <ul class="navbar-nav bd-navbar-nav flex-row">
73      <li class="nav-item">
74        <a class="nav-link active" href="/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Bootstrap');">Home</a>
75      </li>
76      <li class="nav-item">
77        <a class="nav-link " href="/docs/4.3/getting-started/introduction/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Docs');">Documentation</a>
78      </li>
79      <li class="nav-item">
80        <a class="nav-link " href="/docs/4.3/examples/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Examples');">Examples</a>
81      </li>
82      <li class="nav-item">
83        <a class="nav-link" href="https://themes.getbootstrap.com/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Themes');" target="_blank" rel="noopener">Themes</a>
84      </li>
85      <li class="nav-item">
86        <a class="nav-link" href="https://expo.getbootstrap.com/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Expo');" target="_blank" rel="noopener">Expo</a>
87      </li>
88      <li class="nav-item">
89        <a class="nav-link" href="https://blog.getbootstrap.com/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Blog');" target="_blank" rel="noopener">Blog</a>
90      </li>
91    </ul>
92  </div>
93
94  <ul class="navbar-nav flex-row ml-md-auto d-none d-md-flex">
95    <li class="nav-item dropdown">
96      <a class="nav-item nav-link dropdown-toggle mr-md-2" href="#" id="bd-versions" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
97        v4.3
98      </a>
99      <div class="dropdown-menu dropdown-menu-right" aria-labelledby="bd-versions">
100        <a class="dropdown-item active" href="/docs/4.3/">Latest (4.3.x)</a>
101        <a class="dropdown-item" href="https://getbootstrap.com/docs/4.2/">v4.2.1</a>
102        <a class="dropdown-item" href="https://getbootstrap.com/docs/4.0/">v4.0.0</a>
103        <div class="dropdown-divider"></div>
104        <a class="dropdown-item" href="https://v4-alpha.getbootstrap.com/">v4 Alpha 6</a>
105        <a class="dropdown-item" href="https://getbootstrap.com/docs/3.4/">v3.4.0</a>
106        <a class="dropdown-item" href="https://getbootstrap.com/docs/3.3/">v3.3.7</a>
107        <a class="dropdown-item" href="https://getbootstrap.com/2.3.2/">v2.3.2</a>
108        <div class="dropdown-divider"></div>
109        <a class="dropdown-item" href="/docs/versions/">All versions</a>
110      </div>
111    </li>
112
113    <li class="nav-item">
114      <a class="nav-link p-2" href="https://github.com/twbs/bootstrap" 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>
115    </li>
116    <li class="nav-item">
117      <a class="nav-link p-2" 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>
117<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>
118    </li>
119    <li class="nav-item">
120      <a class="nav-link p-2" 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>
121    </li>
122    <li class="nav-item">
123      <a class="nav-link p-2" 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>
124    </li>
125  </ul>
126
127  <a class="btn btn-bd-download d-none d-lg-inline-block mb-3 mb-md-0 ml-md-3" href="/docs/4.3/getting-started/download/">Download</a>
128</header>
129
130
131    <main class="bd-masthead" id="content" role="main">
132  <div class="container">
133    <div class="row align-items-center">
134      <div class="col-6 mx-auto col-md-6 order-md-2">
135        <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="512" height="430" class="img-fluid mb-3 mb-md-0" role="img" viewBox="0 0 1024 860" focusable="false"><title>Bootstrap</title><defs>
135<linearGradient id="c" x1="50%" x2="50%" y1="0%" y2="100%"><stop offset="0%" stop-color="#5C24AE"/><stop offset="100%" stop-color="#30135A"/></linearGradient><path id="b" d="M355.967 242.807l-322 216.395c-44.275 29.754-44.275 78.443 0 108.197l322 216.395c44.275 29.754 116.725 29.754 161 0l322-216.395c44.275-29.754 44.275-78.443 0-108.197l-322-216.395c-44.275-29.754-116.725-29.754-161 0z"/><filter id="a" width="108%" height="112%" x="-4%" y="-4.3%" filterUnits="objectBoundingBox"><feOffset dy="10" in="SourceAlpha" result="shadowOffsetOuter1"/><feGaussianBlur in="shadowOffsetOuter1" result="shadowBlurOuter1" stdDeviation="10"/><feColorMatrix in="shadowBlurOuter1" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.25 0"/></filter><linearGradient id="f" x1="50%" x2="50%" y1="-17.303%" y2="100%"><stop offset="0%" stop-color="#7331D4"/><stop offset="100%" stop-color="#461B84"/></linearGradient><path id="e" d="M355.967 132.807l-322 216.395c-44.275 29.754-44.275 78.443 0 108.197l322 216.395c44.275 29.754 116.725 29.754 161 0l322-216.395c44.275-29.754 44.275-78.443 0-108.197l-322-216.395c-44.275-29.754-116.725-29.754-161 0z"/><filter id="d" width="108%" height="112%" x="-4%" y="-4.3%" filterUnits="objectBoundingBox"><feOffset dy="10" in="SourceAlpha" result="shadowOffsetOuter1"/><feGaussianBlur in="shadowOffsetOuter1" result="shadowBlurOuter1" stdDeviation="10"/><feColorMatrix in="shadowBlurOuter1" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.25 0"/></filter>
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136      </div>
137      <div class="col-md-6 order-md-1 text-center text-md-left pr-md-5">
138        <h1 class="mb-3 bd-text-purple-bright">Bootstrap</h1>
139        <p class="lead">
140          Build responsive, mobile-first projects on the web with the world’s most popular front-end component library.
141        </p>
142        <p class="lead mb-4">
143          Bootstrap is an open source toolkit for developing with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.
144        </p>
145        <div class="row mx-n2">
146          <div class="col-md px-2">
147            <a href="/docs/4.3/getting-started/introduction/" class="btn btn-lg btn-bd-primary w-100 mb-3" onclick="ga('send', 'event', 'Jumbotron actions', 'Get started', 'Get started');">Get started</a>
148          </div>
149          <div class="col-md px-2">
150            <a href="/docs/4.3/getting-started/download/" class="btn btn-lg btn-outline-secondary w-100 mb-3" onclick="ga('send', 'event', 'Jumbotron actions', 'Download', 'Download 4.3.1');">Download</a>
151          </div>
152        </div>
153        <p class="text-muted mb-0">
154          Currently v4.3.1
155        </p>
156      </div>
157    </div>
158    
158<script async src="https://cdn.carbonads.com/carbon.js?serve=CKYIKKJL&placement=getbootstrapcom" id="_carbonads_js"></script>
158
159
160  </div>
161</main>
162
163<div class="masthead-followup row m-0 border border-white">
164  <div class="col-12 col-md-4 p-3 p-md-5 bg-light border border-white">
165    <!-- Icon by Bytesize https://github.com/danklammer/bytesize-icons -->
166    <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="none" stroke="currentcolor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" aria-hidden="true" class="text-primary mb-2" viewBox="0 0 32 32" focusable="false"><title>Import</title><path d="M28 22v8H4v-8M16 4v20m-8-8l8 8 8-8"/></svg>
167    <h3>Installation</h3>
168    <p>Include Bootstrap’s source Sass and JavaScript files via npm, Composer or Meteor. Package managed installs don’t include documentation, but do include our build system and readme.</p>
169
170<figure class="highlight"><pre><code class="language-sh" data-lang="sh">npm <span class="nb">install </span>bootstrap</code></pre></figure>
171
172<figure class="highlight"><pre><code class="language-sh" data-lang="sh">gem <span class="nb">install </span>bootstrap <span class="nt">-v</span> 4.3.1</code></pre></figure>
173
174    <hr class="half-rule">
175    <a class="btn btn-outline-primary" href="/docs/4.3/getting-started/download/">Read installation docs</a>
176  </div>
177
178  <div class="col-12 col-md-4 p-3 p-md-5 bg-light border border-white">
179    <!-- Icon by Bytesize https://github.com/danklammer/bytesize-icons -->
180    <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="none" stroke="currentcolor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" aria-hidden="true" class="text-primary mb-2" viewBox="0 0 32 32" focusable="false"><title>Download</title><path d="M9 22c-9 1-8-10 0-9C6 2 23 2 22 10c10-3 10 13 1 12m-12 4l5 4 5-4m-5-10v14"/></svg>
181    <h3>BootstrapCDN</h3>
182    <p>When you only need to include Bootstrap’s compiled CSS or JS, you can use <a href="https://www.bootstrapcdn.com/">BootstrapCDN</a>.</p>
183
184<h5>CSS only</h5>
185<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt">&lt;link</span> <span class="na">rel=</span><span class="s">"stylesheet"</span> <span class="na">href=</span><span class="s">"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"</span> <span class="na">integrity=</span><span class="s">"sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">&gt;</span></code></pre></figure>
186
187<h5>JS, Popper.js, and jQuery</h5>
188<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt">&lt;script </span><span class="na">src=</span><span class="s">"https://code.jquery.com/jquery-3.3.1.slim.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">&gt;&lt;/script&gt;</span>
189<span class="nt">&lt;script </span><span class="na">src=</span><span class="s">"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">&gt;&lt;/script&gt;</span>
190<span class="nt">&lt;script </span><span class="na">src=</span><span class="s">"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"</span> <span class="na">integrity=</span><span class="s">"sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM"</span> <span class="na">crossorigin=</span><span class="s">"anonymous"</span><span class="nt">&gt;&lt;/script&gt;</span></code></pre></figure>
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224
225<script>window.jQuery || document.write('
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225<script src="/docs/4.3/dist/js/bootstrap.bundle.js"></script>
225<script src="/docs/4.3/assets/js/vendor/anchor.min.js"></script>
225
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226<script src="/docs/4.3/assets/js/vendor/clipboard.min.js"></script>
226
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227<script src="/docs/4.3/assets/js/vendor/bs-custom-file-input.min.js"></script>
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228<script src="/docs/4.3/assets/js/src/application.js"></script>
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229<script src="/docs/4.3/assets/js/src/search.js"></script>
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230<script src="/docs/4.3/assets/js/src/ie-emulation-modes-warning.js"></script>
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Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.