r.</li><li>It can be used to target CSS for styling, without the need for <code>&lt;div&gt;</code> and <code>data-</code> elements. It&#39;s more explicitly for constraint violation messaging.</li></ul><p>To make <a href="/brut-js/api/ConstraintViolationMessages.html" target="_self" rel="noopener" data-no-router><code style="white-space:nowrap;">&lt;brut-cv-messages&gt;</code></a> work with client-side constraint violations, the <code>&lt;form&gt;</code> must be contained by a <a href="/brut-js/api/Form.htm