bootstrap
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The most popular front-end framework for developing responsive, mobile first projects on the web.
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HTML
<div class="bs-docs-section">
<h1 id="accessibility" class="page-header">Accessibility</h1>
<p class="lead">Bootstrap follows common web standards and—with minimal extra effort—can be used to create sites that are accessible to those using <abbr title="Assistive Technology" class="initialism">AT</abbr>.</p>
<h3>Skip navigation</h3>
<p>If your navigation contains many links and comes before the main content in the DOM, add a <code>Skip to main content</code> link immediately after your opening <code><body></code> tag. <a href="http://a11yproject.com/posts/skip-nav-links/">(read why)</a></p>
{% highlight html %}
<body>
<a href="#content" class="sr-only sr-only-focusable">Skip to main content</a>
<div class="container" id="content">
The main page content.
</div>
</body>
{% endhighlight %}
<h3>Nested headings</h3>
<p>When nesting headings (<code><h1></code> - <code><h6></code>), your primary document header should be an <code><h1></code>. Subsequent headings should make logical use of <code><h2></code> - <code><h6></code> such that screen readers can construct a table of contents for your pages.</p>
<p>Learn more at <a href="http://squizlabs.github.io/HTML_CodeSniffer/Standards/Section508/">HTML CodeSniffer</a> and <a href="http://accessibility.psu.edu/headings">Penn State's AccessAbility</a>.</p>
<h3>Additional resources</h3>
<ul>
<li><a href="https://github.com/squizlabs/HTML_CodeSniffer">"HTML Codesniffer" bookmarklet for identifying accessibility issues</a></li>
<li><a href="http://a11yproject.com/">The A11Y Project</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Accessibility">MDN accessibility documentation</a></li>
</ul>
</div>