Symfony: Disabling HTML5 Form Validation Globally

NoValidateExtension.php

<?php
namespace Acme\Form\Extension;

use JMS\DiExtraBundle\Annotation\Service;
use JMS\DiExtraBundle\Annotation\Tag;
use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;

/**
 * @Service
 * @Tag(name="form.type_extension", attributes={"alias":"form"})
 */
class NoValidateExtension extends AbstractTypeExtension
{
    /**
     * {@inheritdoc}
     */
    public function buildView(FormView $view, FormInterface $form, array $options)
    {
        $view->vars['attr'] = array_merge($view->vars['attr'], [
            'novalidate' => 'novalidate',
        ]);
    }

    /**
     * {@inheritdoc}
     */
    public function getExtendedType()
    {
        return 'form';
    }
}