mirror of
https://github.com/twbs/bootstrap.git
synced 2025-10-31 00:04:27 -04:00
33 lines
2.9 KiB
HTML
33 lines
2.9 KiB
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 before the navigation <a href="http://a11yproject.com/posts/skip-nav-links/">(read why)</a>. Using the <code>.sr-only</code> class will visually hide the skip link, and the <code>.sr-only-focusable</code> class will ensure that the link becomes visible once focused (for sighted keyboard users).</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>Color contrast</h3>
|
|
<p>Currently, some of the default color combinations available in Bootstrap (such as the various <a href="../css/#buttons">styled button</a> classes, some of the code highlighting colors used for <a href="../css/#code-block">basic code blocks</a>, the <code>.bg-primary</code> <a href="../css/#helper-classes-backgrounds">contextual background</a> helper class, and the default link color when used on a white background) have a low contrast ratio (below the <a href="http://www.w3.org/TR/WCAG20/#visual-audio-contrast-contrast">recommended ratio of 4.5:1</a>). This can cause problems to users with low vision or who are color blind. These default colors may need to be modified to increase their contrast and legibility.</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="https://chrome.google.com/webstore/detail/accessibility-developer-t/fpkknkljclfencbdbgkenhalefipecmb?hl=en">Chrome's Accessibility Developer Tools extension</a></li>
|
|
<li><a href="http://www.paciellogroup.com/resources/contrastanalyser/">Colour Contrast Analyser</a>
|
|
<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>
|