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1301 lines
35 KiB
HTML
1301 lines
35 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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<title>
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Accessibility · Bootstrap Material Design
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</title>
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<!-- Twitter -->
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<meta name="twitter:site" content="@FezVrasta">
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<meta name="twitter:creator" content="@FezVrasta">
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<meta name="twitter:card" content="summary">
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<meta name="twitter:title" content="Accessibility">
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<meta name="twitter:description" content="A brief overview of Bootstrap's features and limitations for the creation of accessible content.">
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<meta name="twitter:image" content="https://fezvrasta.github.io/assets/brand/bootstrap-social-logo.png">
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<!-- Facebook -->
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<meta property="og:url" content="https://fezvrasta.github.io/docs/4.0/getting-started/accessibility/">
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<meta property="og:title" content="Accessibility">
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<meta property="og:description" content="A brief overview of Bootstrap's features and limitations for the creation of accessible content.">
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<meta property="og:type" content="website">
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<meta property="og:image" content="http://fezvrasta.github.io/assets/brand/bootstrap-social.png">
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<meta property="og:image:secure_url" content="https://fezvrasta.github.io/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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<!-- Meta -->
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<meta name="description" content="The most popular HTML, CSS, and JS Material Design library in the world.">
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<meta name="author" content="Federico Zivolo and Bootstrap contributors">
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<!-- Bootstrap core CSS -->
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<link href="/bootstrap-material-design/dist/css/bootstrap-material-design.css" rel="stylesheet">
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<link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700" rel="stylesheet" >
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<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
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<!-- Documentation extras -->
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/2/docsearch.min.css" />
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<link href="/bootstrap-material-design/assets/css/docs.min.css" rel="stylesheet">
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<!-- Favicons -->
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<link rel="apple-touch-icon" href="/bootstrap-material-design/apple-touch-icon.png">
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<link rel="icon" href="/bootstrap-material-design/favicon.ico">
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<script>
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(function (i, s, o, g, r, a, m) {
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i['GoogleAnalyticsObject'] = r; i[r] = i[r] || function () {
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(i[r].q = i[r].q || []).push(arguments)
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}, i[r].l = 1 * new Date(); a = s.createElement(o),
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m = s.getElementsByTagName(o)[0]; a.async = 1; a.src = g; m.parentNode.insertBefore(a, m)
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})(window, document, 'script', 'https://www.google-analytics.com/analytics.js', 'ga');
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ga('create', 'UA-80431047-1', 'auto');
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ga('send', 'pageview');
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</script>
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</head>
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<body class="bd-docs" data-spy="scroll" data-target=".bd-sidenav-active">
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<a id="skippy" class="sr-only sr-only-focusable" href="#content">
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<div class="container">
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<span class="skiplink-text">Skip to main content</span>
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</div>
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</a>
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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="/bootstrap-material-design/" aria-label="Bootstrap">
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<svg class="d-block" width="36" height="36" viewbox="0 0 612 612" xmlns="http://www.w3.org/2000/svg" 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>
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</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="/bootstrap-material-design/" 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="/bootstrap-material-design/docs/4.0/" 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="/bootstrap-material-design/docs/4.0/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://www.creative-tim.com/product/material-dashboard-pro?affiliate_id=87385" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Material Dashboard Pro');" target="_blank" rel="noopener">Material Dashboard</a>
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</li>
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<li class="nav-item">
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<a class="nav-link" href="https://www.creative-tim.com/product/material-kit-pro?affiliate_id=87385" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Material Kit Pro');" target="_blank" rel="noopener">Material Kit</a>
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</li>
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</ul>
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</div>
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<ul class="navbar-nav flex-row ml-md-auto d-none d-md-flex">
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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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v4.0
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</a>
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<div class="dropdown-menu dropdown-menu-right" aria-labelledby="bd-versions">
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<a class="dropdown-item active" href="/bootstrap-material-design/docs/4.0/">Latest (4.x)</a>
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<a class="dropdown-item" href="https://cdn.rawgit.com/FezVrasta/bootstrap-material-design/gh-pages-v3/index.html">v3.x</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 p-2" href="https://github.com/FezVrasta/bootstrap-material-design" target="_blank" rel="noopener" aria-label="GitHub">
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<svg class="navbar-nav-svg" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 512 499.36" focusable="false"><title>GitHub</title><path 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" fill="currentColor" fill-rule="evenodd"/></svg>
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</a>
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</li>
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<li class="nav-item">
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<a class="nav-link p-2" href="https://twitter.com/FezVrasta" target="_blank" rel="noopener" aria-label="Twitter">
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<svg class="navbar-nav-svg" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 512 416.32" focusable="false"><title>Twitter</title><path 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" fill="currentColor"/></svg>
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</a>
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</li>
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<li class="nav-item">
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<a class="nav-link p-2" href="https://bootstrap-slack.herokuapp.com" target="_blank" rel="noopener" aria-label="Slack">
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<svg class="navbar-nav-svg" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 512 512" 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 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" fill="currentColor"/></svg>
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</a>
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</li>
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</ul>
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<a class="btn btn-bd-yellow d-none d-lg-inline-block mb-3 mb-md-0 ml-md-3" href="https://github.com/FezVrasta/bootstrap-material-design/releases">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-12 col-md-3 col-xl-2 bd-sidebar">
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<form 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">
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<button class="btn-link 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 avigation">
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<svg class="" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 30 30" width="30" height="30" focusable="false"><title>Menu</title><path stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-miterlimit="10" d="M4 7h22M4 15h22M4 23h22"/></svg>
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</button>
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</form>
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<nav class="collapse bd-links" id="bd-docs-nav">
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<div class="bd-toc-item active">
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<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/getting-started/introduction/">
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Getting started
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</a>
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<ul class="nav bd-sidenav">
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/introduction/">
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Introduction
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/download/">
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Download
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/contents/">
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Contents
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/browsers-devices/">
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Browsers & devices
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/javascript/">
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JavaScript
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/options/">
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Options
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/build-tools/">
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Build tools
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/webpack/">
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Webpack
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</a>
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</li>
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<li class="active bd-sidenav-active">
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<a href="/bootstrap-material-design/docs/4.0/getting-started/accessibility/">
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Accessibility
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</a>
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</li>
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</ul>
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</div>
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<div class="bd-toc-item ">
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<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/layout/overview/">
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Layout
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</a>
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<ul class="nav bd-sidenav">
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/layout/overview/">
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Overview
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/layout/grid/">
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Grid
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/layout/media-object/">
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Media object
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/layout/utilities-for-layout/">
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Utilities for layout
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</a>
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</li>
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</ul>
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</div>
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<div class="bd-toc-item ">
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<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/content/reboot/">
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Content
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</a>
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<ul class="nav bd-sidenav">
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/content/reboot/">
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Reboot
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/content/typography/">
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Typography
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/content/code/">
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Code
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/content/images/">
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Images
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/content/tables/">
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Tables
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</a>
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</li>
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<li class="">
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<a href="/bootstrap-material-design/docs/4.0/content/figures/">
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Figures
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</a>
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</li>
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</ul>
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</div>
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<div class="bd-toc-item ">
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<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/components/alerts/">
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Components
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</a>
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<ul class="nav bd-sidenav">
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|
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|
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||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/alerts/">
|
||
Alerts
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/badge/">
|
||
Badge
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/breadcrumb/">
|
||
Breadcrumb
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/buttons/">
|
||
Buttons
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/button-group/">
|
||
Button group
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/card/">
|
||
Card
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/carousel/">
|
||
Carousel
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/collapse/">
|
||
Collapse
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/dropdowns/">
|
||
Dropdowns
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/forms/">
|
||
Forms
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/input-group/">
|
||
Input group
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/jumbotron/">
|
||
Jumbotron
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/list-group/">
|
||
List group
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/modal/">
|
||
Modal
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/navs/">
|
||
Navs
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/navbar/">
|
||
Navbar
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/pagination/">
|
||
Pagination
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/popovers/">
|
||
Popovers
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/progress/">
|
||
Progress
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/scrollspy/">
|
||
Scrollspy
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/components/tooltips/">
|
||
Tooltips
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div class="bd-toc-item ">
|
||
<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/material-design/buttons/">
|
||
Material Design
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/buttons/">
|
||
Buttons
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/collapse-inline/">
|
||
Collapse inline
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/drawers/">
|
||
Drawers
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/extensions/">
|
||
Extensions
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/forms/">
|
||
Forms
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/labels/">
|
||
Labels
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/list-groups/">
|
||
List groups
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/menus/">
|
||
Menus
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/navs/">
|
||
Navs
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/selections/">
|
||
Selections
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/material-design/snackbars/">
|
||
Snackbars
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div class="bd-toc-item ">
|
||
<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/utilities/borders/">
|
||
Utilities
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/borders/">
|
||
Borders
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/clearfix/">
|
||
Clearfix
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/close-icon/">
|
||
Close icon
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/colors/">
|
||
Colors
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/display/">
|
||
Display
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/embed/">
|
||
Embed
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/flex/">
|
||
Flex
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/float/">
|
||
Float
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/image-replacement/">
|
||
Image replacement
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/position/">
|
||
Position
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/screenreaders/">
|
||
Screenreaders
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/sizing/">
|
||
Sizing
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/spacing/">
|
||
Spacing
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/text/">
|
||
Text
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/vertical-align/">
|
||
Vertical align
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/utilities/visibility/">
|
||
Visibility
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div class="bd-toc-item ">
|
||
<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/extend/icons/">
|
||
Extend
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="">
|
||
<a href="/bootstrap-material-design/docs/4.0/extend/icons/">
|
||
Icons
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div class="bd-toc-item ">
|
||
<a class="bd-toc-link" href="/bootstrap-material-design/docs/4.0/migration/">
|
||
Migration
|
||
</a>
|
||
|
||
<ul class="nav bd-sidenav">
|
||
|
||
</ul>
|
||
</div>
|
||
|
||
</nav>
|
||
|
||
</div>
|
||
|
||
|
||
<div class="d-none d-xl-block col-xl-2 bd-toc">
|
||
<ul class="section-nav">
|
||
<li class="toc-entry toc-h2"><a href="#overview-and-limitations">Overview and Limitations</a>
|
||
<ul>
|
||
<li class="toc-entry toc-h3"><a href="#structural-markup">Structural markup</a></li>
|
||
<li class="toc-entry toc-h3"><a href="#interactive-components">Interactive components</a></li>
|
||
<li class="toc-entry toc-h3"><a href="#color-contrast">Color contrast</a></li>
|
||
<li class="toc-entry toc-h3"><a href="#visually-hidden-content">Visually hidden content</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toc-entry toc-h2"><a href="#additional-resources">Additional resources</a></li>
|
||
</ul>
|
||
</div>
|
||
|
||
|
||
<main class="col-12 col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
|
||
<h1 class="bd-title" id="content">Accessibility</h1>
|
||
<p class="bd-lead">A brief overview of Bootstrap's features and limitations for the creation of accessible content.</p>
|
||
<script async type="text/javascript" src="https://cdn.carbonads.com/carbon.js?zoneid=1673&serve=C6AILKT&placement=fezvrastagithubiobootstrapmateri" id="_carbonads_js"></script>
|
||
|
||
<p>Bootstrap provides an easy-to-use framework of ready-made styles, layout tools, and interactive components, allowing developers to create websites and applications that are visually appealing, functionally rich, and accessible out of the box.</p>
|
||
|
||
<h2 id="overview-and-limitations">Overview and Limitations</h2>
|
||
|
||
<p>The overall accessibility of any project built with Bootstrap depends in large part on the author’s markup, additional styling, and scripting they’ve included. However, provided that these have been implemented correctly, it should be perfectly possible to create websites and applications with Bootstrap that fulfill <a href="https://www.w3.org/TR/WCAG20/"><abbr title="Web Content Accessibility Guidelines">WCAG</abbr> 2.0</a> (A/AA/AAA), <a href="https://www.section508.gov/">Section 508</a> and similar accessibility standards and requirements.</p>
|
||
|
||
<h3 id="structural-markup">Structural markup</h3>
|
||
|
||
<p>Bootstrap’s styling and layout can be applied to a wide range of markup structures. This documentation aims to provide developers with best practice examples to demonstrate the use of Bootstrap itself and illustrate appropriate semantic markup, including ways in which potential accessibility concerns can be addressed.</p>
|
||
|
||
<h3 id="interactive-components">Interactive components</h3>
|
||
|
||
<p>Bootstrap’s interactive components—such as modal dialogs, dropdown menus and custom tooltips—are designed to work for touch, mouse and keyboard users. Through the use of relevant <a href="https://www.w3.org/WAI/intro/aria"><abbr title="Web Accessibility Initiative">WAI</abbr>-<abbr title="Accessible Rich Internet Applications">ARIA</abbr></a> roles and attributes, these components should also be understandable and operable using assistive technologies (such as screen readers).</p>
|
||
|
||
<p>Because Bootstrap’s components are purposely designed to be fairly generic, authors may need to include further <abbr title="Accessible Rich Internet Applications">ARIA</abbr> roles and attributes, as well as JavaScript behavior, to more accurately convey the precise nature and functionality of their component. This is usually noted in the documentation.</p>
|
||
|
||
<h3 id="color-contrast">Color contrast</h3>
|
||
|
||
<p>Most colors that currently make up Bootstrap’s default palette—used throughout the framework for things such as button variations, alert variations, form validation indicators—lead to <em>insufficient</em> color contrast (below the recommended <a href="https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html">WCAG 2.0 color contrast ratio of 4.5:1</a>) when used against a light background. Authors will need to manually modify/extend these default colors to ensure adequate color contrast ratios.</p>
|
||
|
||
<h3 id="visually-hidden-content">Visually hidden content</h3>
|
||
|
||
<p>Content which should be visually hidden, but remain accessible to assistive technologies such as screen readers, can be styled using the <code class="highlighter-rouge">.sr-only</code> class. This can be useful in situations where additional visual information or cues (such as meaning denoted through the use of color) need to also be conveyed to non-visual users.</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><p</span> <span class="na">class=</span><span class="s">"text-danger"</span><span class="nt">></span>
|
||
<span class="nt"><span</span> <span class="na">class=</span><span class="s">"sr-only"</span><span class="nt">></span>Danger: <span class="nt"></span></span>
|
||
This action is not reversible
|
||
<span class="nt"></p></span></code></pre></figure>
|
||
|
||
<p>For visually hidden interactive controls, such as traditional “skip” links, <code class="highlighter-rouge">.sr-only</code> can be combined with the <code class="highlighter-rouge">.sr-only-focusable</code> class. This will ensure that the control becomes visible once focused (for sighted keyboard users).</p>
|
||
|
||
<figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><a</span> <span class="na">class=</span><span class="s">"sr-only sr-only-focusable"</span> <span class="na">href=</span><span class="s">"#content"</span><span class="nt">></span>Skip to main content<span class="nt"></a></span></code></pre></figure>
|
||
|
||
<h2 id="additional-resources">Additional resources</h2>
|
||
|
||
<ul>
|
||
<li><a href="https://www.w3.org/TR/WCAG20/">Web Content Accessibility Guidelines (WCAG) 2.0</a></li>
|
||
<li><a href="http://a11yproject.com/">The A11Y Project</a></li>
|
||
<li><a href="https://developer.mozilla.org/en-US/docs/Web/Accessibility">MDN accessibility documentation</a></li>
|
||
<li><a href="https://tenon.io/">Tenon.io Accessibility Checker</a></li>
|
||
<li><a href="https://www.paciellogroup.com/resources/contrastanalyser/">Colour Contrast Analyser (CCA)</a></li>
|
||
<li><a href="https://github.com/squizlabs/HTML_CodeSniffer">“HTML Codesniffer” bookmarklet for identifying accessibility issues</a></li>
|
||
</ul>
|
||
|
||
</main>
|
||
</div>
|
||
</div>
|
||
|
||
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
|
||
<script>window.jQuery || document.write('<script src="/bootstrap-material-design/assets/js/vendor/jquery-slim.min.js"><\/script>')</script>
|
||
|
||
<script src="/bootstrap-material-design/assets/js/vendor/popper.min.js"></script>
|
||
|
||
|
||
<script src="/bootstrap-material-design/dist/js/bootstrap-material-design.js"></script>
|
||
|
||
|
||
|
||
<script src="/bootstrap-material-design/assets/js/vendor/anchor.min.js"></script>
|
||
<script src="/bootstrap-material-design/assets/js/vendor/clipboard.min.js"></script>
|
||
<script src="/bootstrap-material-design/assets/js/vendor/holder.min.js"></script>
|
||
<script src="/bootstrap-material-design/assets/js/src/application.js"></script>
|
||
|
||
|
||
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
|
||
<script src="/bootstrap-material-design/assets/js/ie10-viewport-bug-workaround.js"></script>
|
||
<script src="/bootstrap-material-design/assets/js/ie-emulation-modes-warning.js"></script>
|
||
|
||
|
||
<script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/2/docsearch.min.js"></script>
|
||
<script type="text/javascript">
|
||
var docsearch = docsearch({
|
||
apiKey: '48cb48b22351bc71ea5f12f4d1ede198',
|
||
indexName: 'bootstrap-v4',
|
||
inputSelector: '#search-input',
|
||
handleSelected: function (input, event, suggestion) {
|
||
var url = suggestion.url;
|
||
url = suggestion.isLvl1 ? url.split('#')[0]: url;
|
||
// If it's a title we remove the anchor so it does not jump.
|
||
window.location.href = url;
|
||
},
|
||
transformData: function (hits) {
|
||
return hits.map(function (hit) {
|
||
hit.url = hit.url.replace('https://v4-alpha.getbootstrap.com', '/docs/4.0');
|
||
return hit;
|
||
});
|
||
},
|
||
debug: false // Set debug to true if you want to inspect the dropdown
|
||
});
|
||
</script>
|
||
|
||
|
||
<script>
|
||
Holder.addTheme('gray', {
|
||
bg: '#777',
|
||
fg: 'rgba(255,255,255,.75)',
|
||
font: 'Helvetica',
|
||
fontweight: 'normal'
|
||
})
|
||
</script>
|
||
|
||
</body>
|
||
</html>
|