<code>required</code> message will disappear (since the field now has a value)
but the <code>email</code> message will be visible because it is still applicable.</p>
<h3 id="displaying-multiple-messages-at-the-same-time">Displaying multiple messages at the same time</h3>
<p>While <code>ngMessages</code> will by default only display one error element at a time, the <code>ng-messages-multiple</code> attribute can
be applied to the <code>ngMessages</code> container element to cause it to display all applicable