diff --git a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
index 1319dc3..d0aadf1 100644
--- a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
+++ b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
@@ -218,12 +218,24 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
       '#default_value' => isset($items[$delta]->title) ? $items[$delta]->title : NULL,
       '#maxlength' => 255,
       '#access' => $this->getFieldSetting('title') != DRUPAL_DISABLED,
+      '#required' => ($this->getFieldSetting('title') == DRUPAL_REQUIRED && $element['#required']),
     ];
+
     // Post-process the title field to make it conditionally required if URL is
     // non-empty. Omit the validation on the field edit form, since the field
     // settings cannot be saved otherwise.
-    if (!$this->isDefaultValueWidget($form_state) && $this->getFieldSetting('title') == DRUPAL_REQUIRED) {
-      $element['#element_validate'][] = [get_called_class(), 'validateTitleElement'];
+    if (!$this->isDefaultValueWidget($form_state)) {
+      if ($this->getFieldSetting('title') == DRUPAL_REQUIRED) {
+        $element['#element_validate'][] = [get_called_class(), 'validateTitleElement'];
+
+        // Make title required on the front-end when uri filled-in.
+        if (!$element['title']['#required']) {
+          $field_name = $this->fieldDefinition->get('field_name');
+          $element['title']['#states']['required'] = [
+            ':input[name="' . $field_name . '[' . $delta . '][uri]"]' => ['filled' => TRUE]
+          ];
+        }
+      }
     }
 
     // Exposing the attributes array in the widget is left for alternate and more
diff --git a/core/modules/link/tests/src/Functional/LinkFieldTest.php b/core/modules/link/tests/src/Functional/LinkFieldTest.php
index c99ad0a..ecfadcd 100644
--- a/core/modules/link/tests/src/Functional/LinkFieldTest.php
+++ b/core/modules/link/tests/src/Functional/LinkFieldTest.php
@@ -11,6 +11,7 @@
 use Drupal\node\NodeInterface;
 use Drupal\Tests\BrowserTestBase;
 use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\Core\Entity\Entity\EntityFormDisplay;
 
 /**
  * Tests link field widgets and formatters.
@@ -737,4 +738,128 @@ protected function renderTestEntity($id, $view_mode = 'full', $reset = TRUE) {
     return $output;
   }
 
+  /**
+   * Tests for the URL and/or link text are marked as required.
+   *
+   * Three tests are done with different field configurations:
+   *  - Tests for both URL and the link text are both marked as required.
+   *  - Tests for URL marked as required, but the link text is not.
+   *  - Tests for URL not marked as required, but the link text is marked.
+   */
+  function testLinkRequired() {
+    $field_both_required = Unicode::strtolower($this->randomMachineName());
+    $field_url_only = Unicode::strtolower($this->randomMachineName());
+    $field_text_only = Unicode::strtolower($this->randomMachineName());
+
+    foreach ([$field_both_required, $field_url_only, $field_text_only] as $field_name) {
+      FieldStorageConfig::create([
+        'field_name' => $field_name,
+        'entity_type' => 'entity_test',
+        'type' => 'link',
+      ])->save();
+    }
+
+    // Creates a field with both URL and link text set as required.
+    FieldConfig::create([
+      'field_name' => $field_both_required,
+      'entity_type' => 'entity_test',
+      'bundle' => 'entity_test',
+      'label' => 'Read more about this entity',
+      'required' => TRUE,
+      'settings' => [
+        'title' => DRUPAL_REQUIRED,
+        'link_type' => LinkItemInterface::LINK_GENERIC,
+      ],
+    ])->save();
+
+    // Creates a field with only URL set as required.
+    FieldConfig::create([
+      'field_name' => $field_url_only,
+      'entity_type' => 'entity_test',
+      'bundle' => 'entity_test',
+      'label' => 'Read more about this entity',
+      'required' => TRUE,
+      'settings' => [
+        'title' => DRUPAL_OPTIONAL,
+        'link_type' => LinkItemInterface::LINK_GENERIC,
+      ],
+    ])->save();
+
+    // Creates a field with only link text set as required.
+    FieldConfig::create([
+      'field_name' => $field_text_only,
+      'entity_type' => 'entity_test',
+      'bundle' => 'entity_test',
+      'label' => 'Read more about this entity',
+      'required' => FALSE,
+      'settings' => [
+        'title' => DRUPAL_REQUIRED,
+        'link_type' => LinkItemInterface::LINK_GENERIC,
+      ],
+    ])->save();
+
+    // Sets the form display.
+    $component_settings = [
+      'type' => 'link_default',
+      'settings' => [
+        'placeholder_url' => 'http://example.com',
+        'placeholder_title' => 'Enter the text for this link',
+      ],
+    ];
+    EntityFormDisplay::load('entity_test.entity_test.default')
+      ->setComponent($field_both_required, $component_settings)
+      ->setComponent($field_url_only, $component_settings)
+      ->setComponent($field_text_only, $component_settings)
+      ->save();
+
+    // Display creation form.
+    $this->drupalGet('entity_test/add');
+
+    // Tests if both URL and link text are both marked as required for the field
+    // $field_both_required.
+    $result = $this->xpath('//label[contains(@class, :class) and contains(text(), :text) and contains(@for, :for)]', [':class' => 'form-required', ':text' => 'URL', ':for' => 'edit-' . $field_both_required . '-0-uri']);
+    $this->assertEqual(count($result), 1, "URL is marked as required when both the URL and link field are set to required.");
+    $result = $this->xpath('//label[contains(@class, :class) and contains(text(), :text) and contains(@for, :for)]', [':class' => 'form-required', ':text' => 'Link text', ':for' => 'edit-' . $field_both_required . '-0-title']);
+    $this->assertEqual(count($result), 1, "Link text is marked as required when both the URL and link field are set to required.");
+
+    // Tests if only link text marked as required for the field $field_url_only.
+    $result = $this->xpath('//label[contains(@class, :class) and contains(@for, :for)]', [':class' => 'form-required', ':for' => 'edit-' . $field_url_only . '-0-uri']);
+    $this->assertEqual(count($result), 1, "URL is marked as required when only the URL is set to required.");
+    $result = $this->xpath('//label[not(contains(@class, :class)) and contains(@for, :for)]', [':class' => 'form-required', ':for' => 'edit-' . $field_url_only . '-0-title']);
+    $this->assertEqual(count($result), 1, "Link text is not marked as required when only the URL is set to required.");
+
+    // Tests if URL or or link text are not marked as required for
+    // $field_text_only before posting the form.
+    $result = $this->xpath('//label[not(contains(@class, :class)) and contains(@for, :for)]', [':class' => 'form-required', ':for' => 'edit-' . $field_text_only . '-0-uri']);
+    $this->assertEqual(count($result), 1, "Before posting the form the URL is not marked as required when only link text is set as required.");
+    $result = $this->xpath('//label[not(contains(@class, :class)) and contains(@for, :for)]', [':class' => 'form-required', ':for' => 'edit-' . $field_text_only . '-0-title']);
+    $this->assertEqual(count($result), 1, "Before posting the form the link text is not marked as required when only the link text is set to required.");
+
+    // Tests if the link text is not marked as required after posting a form
+    // with data only for URL for the field $field_url_only.
+    $edit = [
+      "{$field_both_required}[0][uri]" => 'http://www.example.com',
+      "{$field_both_required}[0][title]" => 'http://www.example.com',
+      "{$field_url_only}[0][uri]" => 'http://www.example.com',
+    ];
+    $this->drupalPostForm('entity_test/add', $edit, t('Save'));
+    $this->assertNoText(t('@name field is required.', array('@name' => t('Link text'))));
+
+    // Posts all required data, except for the link text for $field_text_only.
+    $edit = [
+      "{$field_both_required}[0][uri]" => 'http://www.example.com',
+      "{$field_both_required}[0][title]" => 'http://www.example.com',
+      "{$field_url_only}[0][uri]" => 'http://www.example.com',
+      "{$field_text_only}[0][uri]" => 'http://www.example.com',
+    ];
+    $this->drupalPostForm('entity_test/add', $edit, t('Save'));
+
+    // Tests if only link text is marked as required for $field_text_only after
+    // posting a form with URL, but without link text.
+    $result = $this->xpath('//label[not(contains(@class, :class)) and contains(@for, :for)]', [':class' => 'form-required', ':for' => 'edit-' . $field_text_only . '-0-uri']);
+    $this->assertEqual(count($result), 1, "URL is not marked as required when only link text is set as required.");
+    $result = $this->xpath('//label[contains(@class, :class) and contains(@for, :for)]', [':class' => 'form-required', ':for' => 'edit-' . $field_text_only . '-0-title']);
+    $this->assertEqual(count($result), 1, "Link text is marked as required when only the link text is set to required.");
+  }
+
 }