+<?php
+
+/**
+ * @file
+ * Contains \Drupal\linkit\Plugin\Linkit\Attribute\Clazz.
+ */
+
+namespace Drupal\linkit\Plugin\Linkit\Attribute;
+
+use Drupal\linkit\AttributeBase;
+
+/**
+ * Class attribute.
+ *
+ * @TODO: For now Drupal filter_html wont support class attributes with
+ * wildcards.
+ * See: \Drupal\filter\Plugin\Filter\FilterHtml::getHTMLRestrictions
+ * See: core/modules/filter/filter.filter_html.admin.js
+ *
+ * @Attribute(
+ * id = "class",
+ * label = @Translation("Class"),
+ * html_name = "class",
+ * description = @Translation("Basic input field for the class attribute."),
+ * )
+ */
+//class Clazz extends AttributeBase {
+//
+// /**
+// * {@inheritdoc}
+// */
+// public function buildFormElement($default_value) {
+// return [
+// '#type' => 'textfield',
+// '#title' => t('Class'),
+// '#maxlength' => 255,
+// '#size' => 40,
+// ];
+// }
+//
+//}