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diff --git a/web/core/modules/system/tests/modules/dialog_renderer_test/src/Render/MainContent/WideModalRenderer.php b/web/core/modules/system/tests/modules/dialog_renderer_test/src/Render/MainContent/WideModalRenderer.php
new file mode 100644
index 000000000..2fd982818
--- /dev/null
+++ b/web/core/modules/system/tests/modules/dialog_renderer_test/src/Render/MainContent/WideModalRenderer.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\dialog_renderer_test\Render\MainContent;
+
+use Drupal\Core\Ajax\AjaxResponse;
+use Drupal\Core\Ajax\OpenModalDialogCommand;
+use Drupal\Core\Controller\TitleResolverInterface;
+use Drupal\Core\Render\MainContent\ModalRenderer;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Default main content renderer for wide modal dialog requests.
+ *
+ * This test class is copied from \Drupal\Core\Render\MainContent\ModalRenderer
+ * to demonstrate selecting a different render via 'data-dialog-renderer' link
+ * attribute.
+ */
+class WideModalRenderer extends ModalRenderer {
+
+  /**
+   * The mode, either 'wide' or 'extra_wide'.
+   *
+   * @var string
+   */
+  protected $mode;
+
+  /**
+   * Constructs a new WideModalRenderer.
+   *
+   * @param \Drupal\Core\Controller\TitleResolverInterface $title_resolver
+   *   The title resolver.
+   * @param string $mode
+   *   The mode, either 'wide' or 'extra_wide'.
+   */
+  public function __construct(TitleResolverInterface $title_resolver, $mode = 'wide') {
+    parent::__construct($title_resolver);
+    $this->mode = $mode;
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function renderResponse(array $main_content, Request $request, RouteMatchInterface $route_match) {
+    $response = new AjaxResponse();
+
+    // First render the main content, because it might provide a title.
+    $content = drupal_render_root($main_content);
+
+    // Attach the library necessary for using the OpenModalDialogCommand and set
+    // the attachments for this Ajax response.
+    $main_content['#attached']['library'][] = 'core/drupal.dialog.ajax';
+    $response->setAttachments($main_content['#attached']);
+
+    // If the main content doesn't provide a title, use the title resolver.
+    $title = isset($main_content['#title']) ? $main_content['#title'] : $this->titleResolver->getTitle($request, $route_match->getRouteObject());
+
+    // Determine the title: use the title provided by the main content if any,
+    // otherwise get it from the routing information.
+    $options = $request->request->get('dialogOptions', []);
+    // Override width option.
+    switch ($this->mode) {
+      case 'wide':
+        $options['width'] = 700;
+        break;
+
+      case 'extra_wide':
+        $options['width'] = 1000;
+        break;
+    }
+
+    $response->addCommand(new OpenModalDialogCommand($title, $content, $options));
+    return $response;
+  }
+
+}