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diff --git a/web/core/modules/system/tests/src/Functional/Form/ElementTest.php b/web/core/modules/system/tests/src/Functional/Form/ElementTest.php
new file mode 100644
index 000000000..57da8daf2
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/Form/ElementTest.php
@@ -0,0 +1,226 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\Form;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests building and processing of core form elements.
+ *
+ * @group Form
+ */
+class ElementTest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['form_test'];
+
+  /**
+   * Tests placeholder text for elements that support placeholders.
+   */
+  public function testPlaceHolderText() {
+    $this->drupalGet('form-test/placeholder-text');
+    $expected = 'placeholder-text';
+    // Test to make sure non-textarea elements have the proper placeholder text.
+    foreach (['textfield', 'tel', 'url', 'password', 'email', 'number'] as $type) {
+      $element = $this->xpath('//input[@id=:id and @placeholder=:expected]', [
+        ':id' => 'edit-' . $type,
+        ':expected' => $expected,
+      ]);
+      $this->assertTrue(!empty($element), format_string('Placeholder text placed in @type.', ['@type' => $type]));
+    }
+
+    // Test to make sure textarea has the proper placeholder text.
+    $element = $this->xpath('//textarea[@id=:id and @placeholder=:expected]', [
+      ':id' => 'edit-textarea',
+      ':expected' => $expected,
+    ]);
+    $this->assertTrue(!empty($element), 'Placeholder text placed in textarea.');
+  }
+
+  /**
+   * Tests expansion of #options for #type checkboxes and radios.
+   */
+  public function testOptions() {
+    $this->drupalGet('form-test/checkboxes-radios');
+
+    // Verify that all options appear in their defined order.
+    foreach (['checkbox', 'radio'] as $type) {
+      $elements = $this->xpath('//input[@type=:type]', [':type' => $type]);
+      $expected_values = ['0', 'foo', '1', 'bar', '>'];
+      foreach ($elements as $element) {
+        $expected = array_shift($expected_values);
+        $this->assertIdentical((string) $element->getAttribute('value'), $expected);
+      }
+    }
+
+    // Verify that the choices are admin filtered as expected.
+    $this->assertRaw("<em>Special Char</em>alert('checkboxes');");
+    $this->assertRaw("<em>Special Char</em>alert('radios');");
+    $this->assertRaw('<em>Bar - checkboxes</em>');
+    $this->assertRaw('<em>Bar - radios</em>');
+
+    // Enable customized option sub-elements.
+    $this->drupalGet('form-test/checkboxes-radios/customize');
+
+    // Verify that all options appear in their defined order, taking a custom
+    // #weight into account.
+    foreach (['checkbox', 'radio'] as $type) {
+      $elements = $this->xpath('//input[@type=:type]', [':type' => $type]);
+      $expected_values = ['0', 'foo', 'bar', '>', '1'];
+      foreach ($elements as $element) {
+        $expected = array_shift($expected_values);
+        $this->assertIdentical((string) $element->getAttribute('value'), $expected);
+      }
+    }
+    // Verify that custom #description properties are output.
+    foreach (['checkboxes', 'radios'] as $type) {
+      $elements = $this->xpath('//input[@id=:id]/following-sibling::div[@class=:class]', [
+        ':id' => 'edit-' . $type . '-foo',
+        ':class' => 'description',
+      ]);
+      $this->assertTrue(count($elements), format_string('Custom %type option description found.', [
+        '%type' => $type,
+      ]));
+    }
+  }
+
+  /**
+   * Tests correct checked attribute for radios element.
+   */
+  public function testRadiosChecked() {
+    // Verify that there is only one radio option checked.
+    $this->drupalGet('form-test/radios-checked');
+    $elements = $this->xpath('//input[@name="radios" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('0', $elements[0]->getValue());
+    $elements = $this->xpath('//input[@name="radios-string" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('bar', $elements[0]->getValue());
+    $elements = $this->xpath('//input[@name="radios-boolean-true" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('1', $elements[0]->getValue());
+    // A default value of FALSE indicates that nothing is set.
+    $elements = $this->xpath('//input[@name="radios-boolean-false" and @checked]');
+    $this->assertCount(0, $elements);
+    $elements = $this->xpath('//input[@name="radios-boolean-any" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('All', $elements[0]->getValue());
+    $elements = $this->xpath('//input[@name="radios-string-zero" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('0', $elements[0]->getValue());
+    $elements = $this->xpath('//input[@name="radios-int-non-zero" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('10', $elements[0]->getValue());
+    $elements = $this->xpath('//input[@name="radios-int-non-zero-as-string" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('100', $elements[0]->getValue());
+    $elements = $this->xpath('//input[@name="radios-empty-string" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('0', $elements[0]->getValue());
+    $elements = $this->xpath('//input[@name="radios-empty-array" and @checked]');
+    $this->assertCount(0, $elements);
+    $elements = $this->xpath('//input[@name="radios-key-FALSE" and @checked]');
+    $this->assertCount(1, $elements);
+    $this->assertSame('0', $elements[0]->getValue());
+  }
+
+  /**
+   * Tests wrapper ids for checkboxes and radios.
+   */
+  public function testWrapperIds() {
+    $this->drupalGet('form-test/checkboxes-radios');
+
+    // Verify that wrapper id is different from element id.
+    foreach (['checkboxes', 'radios'] as $type) {
+      $element_ids = $this->xpath('//div[@id=:id]', [':id' => 'edit-' . $type]);
+      $wrapper_ids = $this->xpath('//fieldset[@id=:id]', [':id' => 'edit-' . $type . '--wrapper']);
+      $this->assertTrue(count($element_ids) == 1, format_string('A single element id found for type %type', ['%type' => $type]));
+      $this->assertTrue(count($wrapper_ids) == 1, format_string('A single wrapper id found for type %type', ['%type' => $type]));
+    }
+  }
+
+  /**
+   * Tests button classes.
+   */
+  public function testButtonClasses() {
+    $this->drupalGet('form-test/button-class');
+    // Just contains(@class, "button") won't do because then
+    // "button--foo" would contain "button". Instead, check
+    // " button ". Make sure it matches in the beginning and the end too
+    // by adding a space before and after.
+    $this->assertEqual(2, count($this->xpath('//*[contains(concat(" ", @class, " "), " button ")]')));
+    $this->assertEqual(1, count($this->xpath('//*[contains(concat(" ", @class, " "), " button--foo ")]')));
+    $this->assertEqual(1, count($this->xpath('//*[contains(concat(" ", @class, " "), " button--danger ")]')));
+  }
+
+  /**
+   * Tests the #group property.
+   */
+  public function testGroupElements() {
+    $this->drupalGet('form-test/group-details');
+    $elements = $this->xpath('//div[@class="details-wrapper"]//div[@class="details-wrapper"]//label');
+    $this->assertTrue(count($elements) == 1);
+    $this->drupalGet('form-test/group-container');
+    $elements = $this->xpath('//div[@id="edit-container"]//div[@class="details-wrapper"]//label');
+    $this->assertTrue(count($elements) == 1);
+    $this->drupalGet('form-test/group-fieldset');
+    $elements = $this->xpath('//fieldset[@id="edit-fieldset"]//div[@id="edit-meta"]//label');
+    $this->assertTrue(count($elements) == 1);
+    $this->drupalGet('form-test/group-vertical-tabs');
+    $elements = $this->xpath('//div[@data-vertical-tabs-panes]//details[@id="edit-meta"]//label');
+    $this->assertTrue(count($elements) == 1);
+    $elements = $this->xpath('//div[@data-vertical-tabs-panes]//details[@id="edit-meta-2"]//label');
+    $this->assertTrue(count($elements) == 1);
+  }
+
+  /**
+   * Tests the #required property on details and fieldset elements.
+   */
+  public function testRequiredFieldsetsAndDetails() {
+    $this->drupalGet('form-test/group-details');
+    $this->assertFalse($this->cssSelect('summary.form-required'));
+    $this->drupalGet('form-test/group-details/1');
+    $this->assertTrue($this->cssSelect('summary.form-required'));
+    $this->drupalGet('form-test/group-fieldset');
+    $this->assertFalse($this->cssSelect('span.form-required'));
+    $this->drupalGet('form-test/group-fieldset/1');
+    $this->assertTrue($this->cssSelect('span.form-required'));
+  }
+
+  /**
+   * Tests a form with a autocomplete setting..
+   */
+  public function testFormAutocomplete() {
+    $this->drupalGet('form-test/autocomplete');
+
+    $result = $this->xpath('//input[@id="edit-autocomplete-1" and contains(@data-autocomplete-path, "form-test/autocomplete-1")]');
+    $this->assertEqual(count($result), 0, 'Ensure that the user does not have access to the autocompletion');
+    $result = $this->xpath('//input[@id="edit-autocomplete-2" and contains(@data-autocomplete-path, "form-test/autocomplete-2/value")]');
+    $this->assertEqual(count($result), 0, 'Ensure that the user does not have access to the autocompletion');
+
+    $user = $this->drupalCreateUser(['access autocomplete test']);
+    $this->drupalLogin($user);
+    $this->drupalGet('form-test/autocomplete');
+
+    // Make sure that the autocomplete library is added.
+    $this->assertRaw('core/misc/autocomplete.js');
+
+    $result = $this->xpath('//input[@id="edit-autocomplete-1" and contains(@data-autocomplete-path, "form-test/autocomplete-1")]');
+    $this->assertEqual(count($result), 1, 'Ensure that the user does have access to the autocompletion');
+    $result = $this->xpath('//input[@id="edit-autocomplete-2" and contains(@data-autocomplete-path, "form-test/autocomplete-2/value")]');
+    $this->assertEqual(count($result), 1, 'Ensure that the user does have access to the autocompletion');
+  }
+
+  /**
+   * Tests form element error messages.
+   */
+  public function testFormElementErrors() {
+    $this->drupalPostForm('form_test/details-form', [], 'Submit');
+    $this->assertText('I am an error on the details element.');
+  }
+
+}