Issue #2774195 by lauriii, claudiu.cristea: Passing attributes to field...

Issue #2774195 by lauriii, claudiu.cristea: Passing attributes to field element label is not possible

core/includes/form.inc

@@ -511,8 +511,6 @@ function template_preprocess_form_element_label(&$variables) {
     $variables['title'] = ['#markup' => $element['#title']];
   }
 
-  $variables['attributes'] = array();
-
   // Pass elements title_display to template.
   $variables['title_display'] = $element['#title_display'];
 

core/modules/system/tests/src/Kernel/Form/FormElementLabelTest.php

+<?php
+
+namespace Drupal\Tests\system\Kernel\Form;
+
+use Drupal\KernelTests\KernelTestBase;
+use Symfony\Component\CssSelector\CssSelectorConverter;
+
+/**
+ * Tests for form_element_label theme hook.
+ *
+ * @group Form
+ */
+class FormElementLabelTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['system'];
+
+  /**
+   * Ensures that attributes can be placed for form element label.
+   */
+  public function testAttributes() {
+    $render_array = [
+      '#type' => 'label',
+      '#attributes' => ['class' => ['kitten']],
+      '#title' => 'Kittens',
+      '#title_display' => 'above',
+    ];
+    $css_selector_converter = new CssSelectorConverter();
+    $this->render($render_array);
+    $elements = $this->xpath($css_selector_converter->toXPath('.kitten'));
+    $this->assertCount(1, $elements);
+  }
+
+}