Visually hide an element while still allowing it to be exposed to assistive technologies (such as screen readers) with `.sr-only`. Use `.sr-only-focusable` to visually hide an element by default, but to display it when it's focused (e.g. by a keyboard-only user). Can also be used as mixins.
{{<example>}}
<h2class="sr-only">Title for screen readers</h2>
<aclass="sr-only-focusable"href="#content">Skip to main content</a>