"bs-callout bs-callout-warning" id="callout-glyphicons-accessibility">
    <h4>Accessible icons</h4>
    <p>Modern versions of assistive technologies will announce CSS generated content, as well as specific Unicode characters. To avoid unintended and confusing output in screen readers (particularly when icons are used purely for decoration), we hide them with the <code>aria-hidden="true"</code> attribute.</p>
    <p>If you're using an icon to convey meaning (rather than only as a decorative element), ensure