<form method="POST">
    <h3>Editing: HIncludeFragmentRenderer.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpKernel\Fragment;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Controller\ControllerReference;
use Symfony\Component\HttpKernel\UriSigner;
use Twig\Environment;

/**
 * Implements the Hinclude rendering strategy.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
class HIncludeFragmentRenderer extends RoutableFragmentRenderer
{
    private ?string $globalDefaultTemplate;
    private ?UriSigner $signer;
    private ?Environment $twig;
    private string $charset;

    /**
     * @param string $globalDefaultTemplate The global default content (it can be a template name or the content)
     */
    public function __construct(Environment $twig = null, UriSigner $signer = null, string $globalDefaultTemplate = null, string $charset = 'utf-8')
    {
        $this-&gt;twig = $twig;
        $this-&gt;globalDefaultTemplate = $globalDefaultTemplate;
        $this-&gt;signer = $signer;
        $this-&gt;charset = $charset;
    }

    /**
     * Checks if a templating engine has been set.
     */
    public function hasTemplating(): bool
    {
        return null !== $this-&gt;twig;
    }

    /**
     * Additional available options:
     *
     *  * default:    The default content (it can be a template name or the content)
     *  * id:         An optional hx:include tag id attribute
     *  * attributes: An optional array of hx:include tag attributes
     */
    public function render(string|ControllerReference $uri, Request $request, array $options = []): Response
    {
        if ($uri instanceof ControllerReference) {
            $uri = (new FragmentUriGenerator($this-&gt;fragmentPath, $this-&gt;signer))-&gt;generate($uri, $request);
        }

        // We need to replace ampersands in the URI with the encoded form in order to return valid html/xml content.
        $uri = str_replace('&amp;', '&amp;amp;', $uri);

        $template = $options['default'] ?? $this-&gt;globalDefaultTemplate;
        if (null !== $this-&gt;twig &amp;&amp; $template &amp;&amp; $this-&gt;twig-&gt;getLoader()-&gt;exists($template)) {
            $content = $this-&gt;twig-&gt;render($template);
        } else {
            $content = $template;
        }

        $attributes = isset($options['attributes']) &amp;&amp; \is_array($options['attributes']) ? $options['attributes'] : [];
        if (isset($options['id']) &amp;&amp; $options['id']) {
            $attributes['id'] = $options['id'];
        }
        $renderedAttributes = '';
        if (\count($attributes) &gt; 0) {
            $flags = \ENT_QUOTES | \ENT_SUBSTITUTE;
            foreach ($attributes as $attribute =&gt; $value) {
                $renderedAttributes .= sprintf(
                    ' %s=&quot;%s&quot;',
                    htmlspecialchars($attribute, $flags, $this-&gt;charset, false),
                    htmlspecialchars($value, $flags, $this-&gt;charset, false)
                );
            }
        }

        return new Response(sprintf('&lt;hx:include src=&quot;%s&quot;%s&gt;%s&lt;/hx:include&gt;', $uri, $renderedAttributes, $content));
    }

    public function getName(): string
    {
        return 'hinclude';
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>