 expression provided to the <code>ngShow</code> attribute. The element is
shown or hidden by removing or adding the <code>.ng-hide</code> CSS class onto the element.</p>
<p>In its default setup, ngAria for <code>ngShow</code> is actually redundant. It toggles <code>aria-hidden</code> on the
directive when it is hidden or shown. However, the default CSS of <code>display: none !important</code>,
already hides child elements from a screen reader. It becomes more useful when the default
CSS is overridden with p