diff --git a/core/lib/Drupal/Component/Diff/Diff.php b/core/lib/Drupal/Component/Diff/Diff.php
index 8135b1582563d793c8780307a879291901251676..c8d82d48c3431acdafbb78ae8d17e67c94611722 100644
--- a/core/lib/Drupal/Component/Diff/Diff.php
+++ b/core/lib/Drupal/Component/Diff/Diff.php
@@ -36,7 +36,7 @@ class Diff {
   public function __construct($from_lines, $to_lines) {
     $eng = new DiffEngine();
     $this->edits = $eng->diff($from_lines, $to_lines);
-    //$this->_check($from_lines, $to_lines);
+    // $this->_check($from_lines, $to_lines);
   }
 
   /**
diff --git a/core/lib/Drupal/Component/Diff/Engine/DiffEngine.php b/core/lib/Drupal/Component/Diff/Engine/DiffEngine.php
index b56aa99aa7ca43b438c4712b0a1b64ee5b273537..4d9770062796cc38dec24d40a6b6e5d250c35eb1 100644
--- a/core/lib/Drupal/Component/Diff/Engine/DiffEngine.php
+++ b/core/lib/Drupal/Component/Diff/Engine/DiffEngine.php
@@ -299,8 +299,8 @@ protected function _compareseq($xoff, $xlim, $yoff, $ylim) {
     }
     else {
       // This is ad hoc but seems to work well.
-      //$nchunks = sqrt(min($xlim - $xoff, $ylim - $yoff) / 2.5);
-      //$nchunks = max(2, min(8, (int)$nchunks));
+      // $nchunks = sqrt(min($xlim - $xoff, $ylim - $yoff) / 2.5);
+      // $nchunks = max(2, min(8, (int)$nchunks));
       $nchunks = min(7, $xlim - $xoff, $ylim - $yoff) + 1;
       list($lcs, $seps) = $this->_diag($xoff, $xlim, $yoff, $ylim, $nchunks);
     }
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
index 16f018490118169b4ea9db7394cc6be905c70dc6..e696f242fd30492164c065a7580c347f0e73dee3 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
@@ -112,7 +112,7 @@ public static function open(array &$connection_options = []) {
     // so backslashes in the password need to be doubled up.
     // The bug was reported against pdo_pgsql 1.0.2, backslashes in passwords
     // will break on this doubling up when the bug is fixed, so check the version
-    //elseif (phpversion('pdo_pgsql') < 'version_this_was_fixed_in') {
+    // elseif (phpversion('pdo_pgsql') < 'version_this_was_fixed_in') {
     else {
       $connection_options['password'] = str_replace('\\', '\\\\', $connection_options['password']);
     }
diff --git a/core/lib/Drupal/Core/Database/StatementInterface.php b/core/lib/Drupal/Core/Database/StatementInterface.php
index a34bf617fabb159d6d1fb858e07290eae4904782..a97043af6243db6c56d710d9c671aba894f5ecb2 100644
--- a/core/lib/Drupal/Core/Database/StatementInterface.php
+++ b/core/lib/Drupal/Core/Database/StatementInterface.php
@@ -37,7 +37,7 @@ interface StatementInterface extends \Traversable {
    * "the access type must be omitted" if it is protected; i.e., conflicting
    * statements). The access type has to be protected.
    */
-  //protected function __construct(Connection $dbh);
+  // protected function __construct(Connection $dbh);
 
   /**
    * Executes a prepared statement
diff --git a/core/lib/Drupal/Core/FileTransfer/FTPExtension.php b/core/lib/Drupal/Core/FileTransfer/FTPExtension.php
index 9f189638ad0de154ad4cb88ee1be9f9dacd2560b..99c1c0688125e738180c7e206a01153282e3e924 100644
--- a/core/lib/Drupal/Core/FileTransfer/FTPExtension.php
+++ b/core/lib/Drupal/Core/FileTransfer/FTPExtension.php
@@ -108,7 +108,7 @@ public function chmodJailed($path, $mode, $recursive) {
     if ($this->isDirectory($path) && $recursive) {
       $filelist = @ftp_nlist($this->connection, $path);
       if (!$filelist) {
-        //empty directory - returns false
+        // empty directory - returns false
         return;
       }
       foreach ($filelist as $file) {
diff --git a/core/modules/comment/src/Controller/CommentController.php b/core/modules/comment/src/Controller/CommentController.php
index c834fa67a1cc818fd5f347105b15aa321549f2d6..a01106d77f611c6614eab9f22295bd1d5978a4fc 100644
--- a/core/modules/comment/src/Controller/CommentController.php
+++ b/core/modules/comment/src/Controller/CommentController.php
@@ -288,7 +288,7 @@ public function replyFormAccess(EntityInterface $entity, $field_name, $pid = NUL
       // Check if the user has the proper permissions.
       $access = $access->andIf(AccessResult::allowedIfHasPermission($account, 'access comments'));
 
-      /// Load the parent comment.
+      // Load the parent comment.
       $comment = $this->entityManager()->getStorage('comment')->load($pid);
       // Check if the parent comment is published and belongs to the entity.
       $access = $access->andIf(AccessResult::allowedIf($comment && $comment->isPublished() && $comment->getCommentedEntityId() == $entity->id()));
diff --git a/core/modules/comment/src/Plugin/views/sort/Thread.php b/core/modules/comment/src/Plugin/views/sort/Thread.php
index 1984934d4703773b1cd68e07e5c209ca521e08b2..44fba2989c3d24631b48ec67017216f7b597a817 100644
--- a/core/modules/comment/src/Plugin/views/sort/Thread.php
+++ b/core/modules/comment/src/Plugin/views/sort/Thread.php
@@ -16,14 +16,14 @@ class Thread extends SortPluginBase {
   public function query() {
     $this->ensureMyTable();
 
-    //Read comment_render() in comment.module for an explanation of the
-    //thinking behind this sort.
+    // Read comment_render() in comment.module for an explanation of the
+    // thinking behind this sort.
     if ($this->options['order'] == 'DESC') {
       $this->query->addOrderBy($this->tableAlias, $this->realField, $this->options['order']);
     }
     else {
       $alias = $this->tableAlias . '_' . $this->realField . 'asc';
-      //@todo is this secure?
+      // @todo is this secure?
       $this->query->addOrderBy(NULL, "SUBSTRING({$this->tableAlias}.{$this->realField}, 1, (LENGTH({$this->tableAlias}.{$this->realField}) - 1))", $this->options['order'], $alias);
     }
   }
diff --git a/core/modules/contact/tests/src/Unit/MailHandlerTest.php b/core/modules/contact/tests/src/Unit/MailHandlerTest.php
index 898ea226c8da5ec48fbb693546b33dea91724bf2..ba3bfad81662c929fd53787b7d62133abdca5d67 100644
--- a/core/modules/contact/tests/src/Unit/MailHandlerTest.php
+++ b/core/modules/contact/tests/src/Unit/MailHandlerTest.php
@@ -234,7 +234,7 @@ public function getSendMailMessages() {
     $results[] = $result + $default_result;
     $data[] = [$message, $sender, $results];
 
-    //For authenticated user.
+    // For authenticated user.
     $results = [];
     $message = $this->getAuthenticatedMockMessage();
     $sender = $this->getMockSender(FALSE, 'user@drupal.org');
diff --git a/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceAutoCreateTest.php b/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceAutoCreateTest.php
index 90895b186f0d8f0ac6ea3e60f6a736ca89cd48ce..1e6511fd68fca392c2b174b67c72ceb3fb29b57c 100644
--- a/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceAutoCreateTest.php
+++ b/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceAutoCreateTest.php
@@ -213,17 +213,17 @@ public function testMultipleTargetBundles() {
     //   a way to catch and assert user-triggered errors.
 
     // Test the case when the field config settings are inconsistent.
-    //unset($handler_settings['auto_create_bundle']);
-    //$field_config->setSetting('handler_settings', $handler_settings);
-    //$field_config->save();
+    // unset($handler_settings['auto_create_bundle']);
+    // $field_config->setSetting('handler_settings', $handler_settings);
+    // $field_config->save();
     //
-    //$this->drupalGet('node/add/' . $this->referencingType);
-    //$error_message = sprintf(
+    // $this->drupalGet('node/add/' . $this->referencingType);
+    // $error_message = sprintf(
     //  "Create referenced entities if they don't already exist option is enabled but a specific destination bundle is not set. You should re-visit and fix the settings of the '%s' (%s) field.",
     //  $field_config->getLabel(),
     //  $field_config->getName()
-    //);
-    //$this->assertErrorLogged($error_message);
+    // );
+    // $this->assertErrorLogged($error_message);
   }
 
 }
diff --git a/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php b/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php
index 2b0be855dd826b967c7a3779f4da8748bd2d7d00..5f4c8ee46be5024bbc2ad51bf5bc6b43c88e2ba4 100644
--- a/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php
+++ b/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php
@@ -272,7 +272,7 @@ public function testDataTableRelationshipWithLongFieldName() {
       $this->assertEqual($row->_entity->id(), $this->entities[$index]->id());
 
       // Test the forward relationship.
-      //$this->assertEqual($row->entity_test_entity_test_mul__field_data_test_id, 1);
+      // $this->assertEqual($row->entity_test_entity_test_mul__field_data_test_id, 1);
 
       // Test that the correct relationship entity is on the row.
       $this->assertEqual($row->_relationship_entities['field_test_data_with_a_long_name']->id(), 1);
diff --git a/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php b/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php
index 578eeda9c639bc0239ee1f03f8a6b6d72e640d04..ba47d91307ce0b6be3a67cc2455e814fcbcfb844 100644
--- a/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php
+++ b/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php
@@ -93,7 +93,7 @@ public function testNumberItem() {
     $this->assertEqual($entity->field_float->value, $new_float);
     $this->assertEqual($entity->field_decimal->value, $new_decimal);
 
-    /// Test sample item generation.
+    // Test sample item generation.
     $entity = EntityTest::create();
     $entity->field_integer->generateSampleItems();
     $entity->field_float->generateSampleItems();
diff --git a/core/modules/filter/filter.module b/core/modules/filter/filter.module
index e3095346ddaa8875230d916e9bd9e1c09ee04d4d..87ff713bdf2665528c608dd02115b872b15e58fc 100644
--- a/core/modules/filter/filter.module
+++ b/core/modules/filter/filter.module
@@ -496,8 +496,8 @@ function _filter_url($text, $filter) {
   $valid_url_query_chars = '[a-zA-Z0-9!?\*\'@\(\);:&=\+\$\/%#\[\]\-_\.,~|]';
   $valid_url_query_ending_chars = '[a-zA-Z0-9_&=#\/]';
 
-  //full path
-  //and allow @ in a url, but only in the middle. Catch things like http://example.com/@user/
+  // full path
+  // and allow @ in a url, but only in the middle. Catch things like http://example.com/@user/
   $valid_url_path = '(?:(?:' . $valid_url_path_characters . '*(?:' . $valid_url_balanced_parens . $valid_url_path_characters . '*)*' . $valid_url_ending_characters . ')|(?:@' . $valid_url_path_characters . '+\/))';
 
   // Prepare domain name pattern.
diff --git a/core/modules/forum/tests/src/Functional/ForumTest.php b/core/modules/forum/tests/src/Functional/ForumTest.php
index 260f63a830c88415c6d460cb7943193a6f64d06f..9ba4be7b2a55c97759367b21e61048d4d7791dfa 100644
--- a/core/modules/forum/tests/src/Functional/ForumTest.php
+++ b/core/modules/forum/tests/src/Functional/ForumTest.php
@@ -118,7 +118,7 @@ protected function setUp() {
    * Tests forum functionality through the admin and user interfaces.
    */
   public function testForum() {
-    //Check that the basic forum install creates a default forum topic
+    // Check that the basic forum install creates a default forum topic
     $this->drupalGet('/forum');
     // Look for the "General discussion" default forum
     $this->assertRaw(Link::createFromRoute(t('General discussion'), 'forum.page', ['taxonomy_term' => 1])->toString(), "Found the default forum at the /forum listing");
diff --git a/core/modules/migrate/src/Plugin/Migration.php b/core/modules/migrate/src/Plugin/Migration.php
index c7457b2025d7724e4d63d581867e8027d71931e9..c81d498460f9b5e2644d1f53f726e9cb27744ac4 100644
--- a/core/modules/migrate/src/Plugin/Migration.php
+++ b/core/modules/migrate/src/Plugin/Migration.php
@@ -572,7 +572,7 @@ public function setProcessOfProperty($property, $process_of_property) {
    */
   public function mergeProcessOfProperty($property, array $process_of_property) {
     // If we already have a process value then merge the incoming process array
-    //otherwise simply set it.
+    // otherwise simply set it.
     $current_process = $this->getProcess();
     if (isset($current_process[$property])) {
       $this->process = NestedArray::mergeDeepArray([$current_process, $this->getProcessNormalized([$property => $process_of_property])], TRUE);
diff --git a/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php b/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php
index 9a453fb7ab5af48fbff99891c8d4442260db3617..546ac3af6d9edb99867348e5eb649cc3644021ef 100644
--- a/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php
+++ b/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php
@@ -172,7 +172,7 @@ public function testEditorWithCustomMetadata() {
         'format' => 'full_html'
       ],
     ];
-    $this->assertEqual($expected, $metadata); //, 'The correct metadata (including custom metadata) is generated.');
+    $this->assertEqual($expected, $metadata); // , 'The correct metadata (including custom metadata) is generated.');
   }
 
 }
diff --git a/core/modules/rdf/tests/src/Functional/EntityReferenceFieldAttributesTest.php b/core/modules/rdf/tests/src/Functional/EntityReferenceFieldAttributesTest.php
index 629c4aa810155475847ba92190839e18b221957a..b91215db5b3d611ede4a02992495aa73877018fc 100644
--- a/core/modules/rdf/tests/src/Functional/EntityReferenceFieldAttributesTest.php
+++ b/core/modules/rdf/tests/src/Functional/EntityReferenceFieldAttributesTest.php
@@ -125,23 +125,23 @@ public function testNodeTeaser() {
       'value' => 'http://www.w3.org/2004/02/skos/core#Concept',
     ];
     // @todo Enable with https://www.drupal.org/node/2072791.
-    //$this->assertTrue($graph->hasProperty($taxonomy_term_1_uri, 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', $expected_value), 'Taxonomy term type found in RDF output (skos:Concept).');
+    // $this->assertTrue($graph->hasProperty($taxonomy_term_1_uri, 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', $expected_value), 'Taxonomy term type found in RDF output (skos:Concept).');
     $expected_value = [
       'type' => 'literal',
       'value' => $term1->getName(),
     ];
-    //$this->assertTrue($graph->hasProperty($taxonomy_term_1_uri, 'http://www.w3.org/2000/01/rdf-schema#label', $expected_value), 'Taxonomy term name found in RDF output (rdfs:label).');
+    // $this->assertTrue($graph->hasProperty($taxonomy_term_1_uri, 'http://www.w3.org/2000/01/rdf-schema#label', $expected_value), 'Taxonomy term name found in RDF output (rdfs:label).');
     // Term 2.
     $expected_value = [
       'type' => 'uri',
       'value' => 'http://www.w3.org/2004/02/skos/core#Concept',
     ];
-    //$this->assertTrue($graph->hasProperty($taxonomy_term_2_uri, 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', $expected_value), 'Taxonomy term type found in RDF output (skos:Concept).');
+    // $this->assertTrue($graph->hasProperty($taxonomy_term_2_uri, 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', $expected_value), 'Taxonomy term type found in RDF output (skos:Concept).');
     $expected_value = [
       'type' => 'literal',
       'value' => $term2->getName(),
     ];
-    //$this->assertTrue($graph->hasProperty($taxonomy_term_2_uri, 'http://www.w3.org/2000/01/rdf-schema#label', $expected_value), 'Taxonomy term name found in RDF output (rdfs:label).');
+    // $this->assertTrue($graph->hasProperty($taxonomy_term_2_uri, 'http://www.w3.org/2000/01/rdf-schema#label', $expected_value), 'Taxonomy term name found in RDF output (rdfs:label).');
   }
 
 }
diff --git a/core/modules/rdf/tests/src/Functional/StandardProfileTest.php b/core/modules/rdf/tests/src/Functional/StandardProfileTest.php
index 76ae39bc8a0a6c3996a58ecdda5560654225388b..8662b9daca55c963d1b8c277155c91765df84522 100644
--- a/core/modules/rdf/tests/src/Functional/StandardProfileTest.php
+++ b/core/modules/rdf/tests/src/Functional/StandardProfileTest.php
@@ -407,7 +407,7 @@ protected function assertRdfaArticleProperties($graph, $message_prefix) {
 
     // Tag type.
     // @todo Enable with https://www.drupal.org/node/2072791.
-    //$this->assertEqual($graph->type($this->termUri), 'schema:Thing', 'Tag type was found (schema:Thing).');
+    // $this->assertEqual($graph->type($this->termUri), 'schema:Thing', 'Tag type was found (schema:Thing).');
 
     // Tag name.
     $expected_value = [
@@ -416,7 +416,7 @@ protected function assertRdfaArticleProperties($graph, $message_prefix) {
       'lang' => 'en',
     ];
     // @todo Enable with https://www.drupal.org/node/2072791.
-    //$this->assertTrue($graph->hasProperty($this->termUri, 'http://schema.org/name', $expected_value), "$message_prefix name was found (schema:name).");
+    // $this->assertTrue($graph->hasProperty($this->termUri, 'http://schema.org/name', $expected_value), "$message_prefix name was found (schema:name).");
   }
 
   /**
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php
index 5b5101445a59bac2c5718bde7eb32f7716950c24..bade2a76c695869793daa7751799fa520b277622 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php
@@ -279,7 +279,7 @@ public function testPostDxWithoutCriticalBaseFields() {
     $this->assertSame(500, $response->getStatusCode());
     $this->assertSame(['text/plain; charset=UTF-8'], $response->getHeader('Content-Type'));
     $this->assertStringStartsWith('The website encountered an unexpected error. Please try again later.</br></br><em class="placeholder">Symfony\Component\HttpKernel\Exception\HttpException</em>: Internal Server Error in <em class="placeholder">Drupal\rest\Plugin\rest\resource\EntityResource-&gt;post()</em>', (string) $response->getBody());
-    //$this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nentity_type: This value should not be null.\n", $response);
+    // $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nentity_type: This value should not be null.\n", $response);
 
     // DX: 422 when missing 'entity_id' field.
     $request_options[RequestOptions::BODY] = $this->serializer->encode(array_diff_key($this->getNormalizedPostEntity(), ['entity_id' => TRUE]), static::$format);
@@ -288,14 +288,14 @@ public function testPostDxWithoutCriticalBaseFields() {
     try {
       $response = $this->request('POST', $url, $request_options);
       // This happens on DrupalCI.
-      //$this->assertSame(500, $response->getStatusCode());
+      // $this->assertSame(500, $response->getStatusCode());
     }
     catch (\Exception $e) {
       // This happens on Wim's local machine.
-      //$this->assertSame("Error: Call to a member function get() on null\nDrupal\\comment\\Plugin\\Validation\\Constraint\\CommentNameConstraintValidator->getAnonymousContactDetailsSetting()() (Line: 96)\n", $e->getMessage());
+      // $this->assertSame("Error: Call to a member function get() on null\nDrupal\\comment\\Plugin\\Validation\\Constraint\\CommentNameConstraintValidator->getAnonymousContactDetailsSetting()() (Line: 96)\n", $e->getMessage());
     }
-    //$response = $this->request('POST', $url, $request_options);
-    //$this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nentity_type: This value should not be null.\n", $response);
+    // $response = $this->request('POST', $url, $request_options);
+    // $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nentity_type: This value should not be null.\n", $response);
 
     // DX: 422 when missing 'entity_type' field.
     $request_options[RequestOptions::BODY] = $this->serializer->encode(array_diff_key($this->getNormalizedPostEntity(), ['field_name' => TRUE]), static::$format);
@@ -303,7 +303,7 @@ public function testPostDxWithoutCriticalBaseFields() {
     // @todo Uncomment, remove next 2 lines in https://www.drupal.org/node/2820364.
     $this->assertSame(500, $response->getStatusCode());
     $this->assertSame(['text/plain; charset=UTF-8'], $response->getHeader('Content-Type'));
-    //$this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nfield_name: This value should not be null.\n", $response);
+    // $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nfield_name: This value should not be null.\n", $response);
   }
 
   /**
diff --git a/core/modules/system/src/Tests/Form/TriggeringElementTest.php b/core/modules/system/src/Tests/Form/TriggeringElementTest.php
index 973d37db9fdcbbb62fc5240e59b15c047bb546f9..fb59cb5e8ac6addb837a8fe64ff384881f496544 100644
--- a/core/modules/system/src/Tests/Form/TriggeringElementTest.php
+++ b/core/modules/system/src/Tests/Form/TriggeringElementTest.php
@@ -89,7 +89,7 @@ public function testAttemptAccessControlBypass() {
     // Ensure that the triggering element was not set to the restricted button.
     // Do this with both a negative and positive assertion, because negative
     // assertions alone can be brittle. See testNoButtonInfoInPost() for why the
-    //triggering element gets set to 'button2'.
+    // triggering element gets set to 'button2'.
     $this->assertNoText('The clicked button is button1.', '$form_state->getTriggeringElement() not set to a restricted button.');
     $this->assertText('The clicked button is button2.', '$form_state->getTriggeringElement() not set to a restricted button.');
   }
diff --git a/core/modules/system/tests/src/Functional/FileTransfer/FileTransferTest.php b/core/modules/system/tests/src/Functional/FileTransfer/FileTransferTest.php
index 76d8be8009f3d3aeafaadba66c73690e1d3bb3df..04b1f663614cc79bfa83748ad43dc25955b02117 100644
--- a/core/modules/system/tests/src/Functional/FileTransfer/FileTransferTest.php
+++ b/core/modules/system/tests/src/Functional/FileTransfer/FileTransferTest.php
@@ -60,7 +60,7 @@ public function _writeDirectory($base, $files = []) {
         $this->_writeDirectory($base . DIRECTORY_SEPARATOR . $key, $file);
       }
       else {
-        //just write the filename into the file
+        // just write the filename into the file
         file_put_contents($base . DIRECTORY_SEPARATOR . $file, $file);
       }
     }
diff --git a/core/modules/update/update.module b/core/modules/update/update.module
index 32b5b8cc8779488712b4f4c41f0861d187ea5990..385434a230fdf36b37332f458d7dce9b594bdd12 100644
--- a/core/modules/update/update.module
+++ b/core/modules/update/update.module
@@ -349,7 +349,7 @@ function update_get_available($refresh = FALSE) {
   foreach ($projects as $key => $project) {
     // If there's no data at all, we clearly need to fetch some.
     if (empty($available[$key])) {
-      //update_create_fetch_task($project);
+      // update_create_fetch_task($project);
       \Drupal::service('update.processor')->createFetchTask($project);
       $needs_refresh = TRUE;
       continue;
diff --git a/core/modules/user/src/Tests/Views/AccessRoleTest.php b/core/modules/user/src/Tests/Views/AccessRoleTest.php
index 57055572d2c45dc0cb97719b229ce388af2f2f0a..addda24f278cf3c324db35369d9e6ef5f3f76fd1 100644
--- a/core/modules/user/src/Tests/Views/AccessRoleTest.php
+++ b/core/modules/user/src/Tests/Views/AccessRoleTest.php
@@ -128,8 +128,8 @@ public function testRenderCaching() {
     // @todo Fix this in https://www.drupal.org/node/2551037,
     // DisplayPluginBase::applyDisplayCacheabilityMetadata() is not invoked when
     // using buildBasicRenderable() and a Views access plugin returns FALSE.
-    //$this->assertTrue(in_array('user.roles', $build['#cache']['contexts']));
-    //$this->assertEqual([], $build['#cache']['tags']);
+    // $this->assertTrue(in_array('user.roles', $build['#cache']['contexts']));
+    // $this->assertEqual([], $build['#cache']['tags']);
     $this->assertEqual(Cache::PERMANENT, $build['#cache']['max-age']);
     $this->assertEqual($result, '');
   }
diff --git a/core/modules/views/src/Plugin/views/PluginBase.php b/core/modules/views/src/Plugin/views/PluginBase.php
index e523ebafaffe6e2f8a20446e795afd4059254e5f..28ae3c2a9bdaa9602cf7874915d2c06589197f26 100644
--- a/core/modules/views/src/Plugin/views/PluginBase.php
+++ b/core/modules/views/src/Plugin/views/PluginBase.php
@@ -351,7 +351,7 @@ protected function viewsTokenReplace($text, $tokens) {
     foreach ($tokens as $token => $replacement) {
       // Twig wants a token replacement array stripped of curly-brackets.
       // Some Views tokens come with curly-braces, others do not.
-      //@todo: https://www.drupal.org/node/2544392
+      // @todo: https://www.drupal.org/node/2544392
       if (strpos($token, '{{') !== FALSE) {
         // Twig wants a token replacement array stripped of curly-brackets.
         $token = trim(str_replace(['{{', '}}'], '', $token));
diff --git a/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php b/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php
index b3956de8ea5ea2175df431cc2c83a324f84c9787..ea2f5b2373f9b05697c6674e48153e923badeb6d 100644
--- a/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php
@@ -131,7 +131,7 @@ public function testArgumentDefaultFixed() {
   /**
    * @todo Test php default argument.
    */
-  //function testArgumentDefaultPhp() {}
+  // function testArgumentDefaultPhp() {}
 
   /**
    * Test node default argument.
diff --git a/core/modules/views/tests/src/Kernel/Handler/SortTranslationTest.php b/core/modules/views/tests/src/Kernel/Handler/SortTranslationTest.php
index 549761d540a14a3e02e8c4a1a01172490484bb41..e49ef7a2c7738e9b37618a883d46598ce419982b 100644
--- a/core/modules/views/tests/src/Kernel/Handler/SortTranslationTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/SortTranslationTest.php
@@ -42,7 +42,7 @@ protected function setUp($import_test_views = TRUE) {
     $this->installEntitySchema('node');
     $this->installEntitySchema('user');
 
-    //$this->installConfig('node');
+    // $this->installConfig('node');
     $this->container->get('kernel')->rebuildContainer();
 
     $node_type = NodeType::create(['type' => 'article']);
diff --git a/core/modules/views/tests/src/Unit/ViewExecutableTest.php b/core/modules/views/tests/src/Unit/ViewExecutableTest.php
index c11e648228100a2ba4cf3feede9fee3f215e27eb..e0aada0285d85472a286617a96c2db1d82c03681 100644
--- a/core/modules/views/tests/src/Unit/ViewExecutableTest.php
+++ b/core/modules/views/tests/src/Unit/ViewExecutableTest.php
@@ -311,7 +311,7 @@ public function testBuildThemeFunctions() {
     ];
     $this->assertEquals($expected, $view->buildThemeFunctions('test_hook'));
 
-    //Change the name of the display plugin and make sure that is in the array.
+    // Change the name of the display plugin and make sure that is in the array.
     $view->display_handler->display['display_plugin'] = 'default2';
 
     $expected = [
diff --git a/core/phpcs.xml.dist b/core/phpcs.xml.dist
index 8475e3f0fe16b93064d24269aaca76d7752a47a3..09371a99b1d646eb5783719abdd52b6b9150cfcb 100644
--- a/core/phpcs.xml.dist
+++ b/core/phpcs.xml.dist
@@ -77,6 +77,15 @@
   <rule ref="../vendor/drupal/coder/coder_sniffer/Drupal/Sniffs/InfoFiles/ClassFilesSniff.php"/>
   <rule ref="../vendor/drupal/coder/coder_sniffer/Drupal/Sniffs/InfoFiles/DuplicateEntrySniff.php"/>
   <rule ref="../vendor/drupal/coder/coder_sniffer/Drupal/Sniffs/InfoFiles/RequiredSniff.php"/>
+  <rule ref="../vendor/drupal/coder/coder_sniffer/Drupal/Sniffs/Commenting/InlineCommentSniff.php">
+    <!-- Sniff for: NoSpaceBefore -->
+    <exclude name="Drupal.Commenting.InlineComment.DocBlock"/>
+    <exclude name="Drupal.Commenting.InlineComment.InvalidEndChar"/>
+    <exclude name="Drupal.Commenting.InlineComment.NotCapital"/>
+    <exclude name="Drupal.Commenting.InlineComment.SpacingAfter"/>
+    <exclude name="Drupal.Commenting.InlineComment.SpacingBefore"/>
+    <exclude name="Drupal.Commenting.InlineComment.WrongStyle"/>
+  </rule>
   <rule ref="../vendor/drupal/coder/coder_sniffer/Drupal/Sniffs/Methods/MethodDeclarationSniff.php">
     <!-- Silence method name underscore warning which is covered already in
       Drupal.NamingConventions.ValidFunctionName.ScopeNotCamelCaps. -->
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
index b3dab6d2b886c75087f7d409f8fc0e12e671fc51..5ded4842b5f80818aed58c4995a2fb3561279b6b 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
@@ -504,7 +504,7 @@ public function testSchemaFallback() {
 
     $definition2 = \Drupal::service('config.typed')->getDefinition('config_schema_test.wildcard_fallback.something.something');
     // This should be the schema of config_schema_test.wildcard_fallback.* as
-    //well.
+    // well.
     $this->assertSame($definition, $definition2);
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Database/LoggingTest.php b/core/tests/Drupal/KernelTests/Core/Database/LoggingTest.php
index 0216d3ed564c107eb4c0a8571d1a723d3fa01268..c262e3813b2dc6b56ed567c80feed81d638d6043 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/LoggingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/LoggingTest.php
@@ -64,7 +64,7 @@ public function testEnableTargetLogging() {
 
     db_query('SELECT name FROM {test} WHERE age > :age', [':age' => 25])->fetchCol();
 
-    db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Ringo'], ['target' => 'replica']);//->fetchCol();
+    db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Ringo'], ['target' => 'replica']);// ->fetchCol();
 
     $queries1 = Database::getLog('testing1');
 
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/Element/EntityAutocompleteElementFormTest.php b/core/tests/Drupal/KernelTests/Core/Entity/Element/EntityAutocompleteElementFormTest.php
index 5d7ea0eb8ed1625dd94a75d04e06cf44a36ae8b7..e5951959aa2fd88d7e4d657eb19936745c2cb411 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/Element/EntityAutocompleteElementFormTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/Element/EntityAutocompleteElementFormTest.php
@@ -353,7 +353,7 @@ public function testEntityAutocompleteAccess() {
   public function testEntityAutocompleteIdInput() {
     /** @var \Drupal\Core\Form\FormBuilderInterface $form_builder */
     $form_builder = $this->container->get('form_builder');
-    //$form = $form_builder->getForm($this);
+    // $form = $form_builder->getForm($this);
     $form_state = (new FormState())
       ->setMethod('GET')
       ->setValues([
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
index a066616f63c29b0807bfefc6e705ea41b131bb90..7d7ea76e90fe9883c6832e8a3351340de353db99 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
@@ -115,7 +115,7 @@ public function testEntityTypeUpdateWithoutData() {
         t('The %field_name field needs to be installed.', ['%field_name' => 'Revision ID']),
       ],
     ];
-    $this->assertEqual($this->entityDefinitionUpdateManager->getChangeSummary(), $expected); //, 'EntityDefinitionUpdateManager reports the expected change summary.');
+    $this->assertEqual($this->entityDefinitionUpdateManager->getChangeSummary(), $expected); // , 'EntityDefinitionUpdateManager reports the expected change summary.');
 
     // Run the update and ensure the revision table is created.
     $this->entityDefinitionUpdateManager->applyUpdates();
diff --git a/core/tests/Drupal/KernelTests/Core/Path/AliasTest.php b/core/tests/Drupal/KernelTests/Core/Path/AliasTest.php
index 704863279f62295b618b082d6d84e2bfbde23b0d..1f49b09ffdc5af3148f66950a596f56114bfc7dc 100644
--- a/core/tests/Drupal/KernelTests/Core/Path/AliasTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Path/AliasTest.php
@@ -16,16 +16,16 @@
 class AliasTest extends PathUnitTestBase {
 
   public function testCRUD() {
-    //Prepare database table.
+    // Prepare database table.
     $connection = Database::getConnection();
     $this->fixtures->createTables($connection);
 
-    //Create Path object.
+    // Create Path object.
     $aliasStorage = new AliasStorage($connection, $this->container->get('module_handler'));
 
     $aliases = $this->fixtures->sampleUrlAliases();
 
-    //Create a few aliases
+    // Create a few aliases
     foreach ($aliases as $idx => $alias) {
       $aliasStorage->save($alias['source'], $alias['alias'], $alias['langcode']);
 
@@ -34,11 +34,11 @@ public function testCRUD() {
 
       $this->assertEqual(count($rows), 1, format_string('Created an entry for %alias.', ['%alias' => $alias['alias']]));
 
-      //Cache the pid for further tests.
+      // Cache the pid for further tests.
       $aliases[$idx]['pid'] = $rows[0]->pid;
     }
 
-    //Load a few aliases
+    // Load a few aliases
     foreach ($aliases as $alias) {
       $pid = $alias['pid'];
       $loadedAlias = $aliasStorage->load(['pid' => $pid]);
@@ -49,7 +49,7 @@ public function testCRUD() {
     $loadedAlias = $aliasStorage->load(['source' => '/node/1']);
     $this->assertEqual($loadedAlias['alias'], '/alias_for_node_1_und', 'The last created alias loaded by default.');
 
-    //Update a few aliases
+    // Update a few aliases
     foreach ($aliases as $alias) {
       $fields = $aliasStorage->save($alias['source'], $alias['alias'] . '_updated', $alias['langcode'], $alias['pid']);
 
@@ -61,7 +61,7 @@ public function testCRUD() {
       $this->assertEqual($pid, $alias['pid'], format_string('Updated entry for pid %pid.', ['%pid' => $pid]));
     }
 
-    //Delete a few aliases
+    // Delete a few aliases
     foreach ($aliases as $alias) {
       $pid = $alias['pid'];
       $aliasStorage->delete(['pid' => $pid]);
@@ -74,11 +74,11 @@ public function testCRUD() {
   }
 
   public function testLookupPath() {
-    //Prepare database table.
+    // Prepare database table.
     $connection = Database::getConnection();
     $this->fixtures->createTables($connection);
 
-    //Create AliasManager and Path object.
+    // Create AliasManager and Path object.
     $aliasManager = $this->container->get('path.alias_manager');
     $aliasStorage = new AliasStorage($connection, $this->container->get('module_handler'));
 
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityTypeBundleInfoTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityTypeBundleInfoTest.php
index 1cc5076be7be4f0f62913cc45d0a7ca22a300b31..259647167c8433bc65e4cbfe81b18c77a1f33a9e 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityTypeBundleInfoTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityTypeBundleInfoTest.php
@@ -100,7 +100,7 @@ protected function setUp() {
 
     $container = $this->prophesize(ContainerInterface::class);
     $container->get('cache_tags.invalidator')->willReturn($this->cacheTagsInvalidator->reveal());
-    //$container->get('typed_data_manager')->willReturn($this->typedDataManager->reveal());
+    // $container->get('typed_data_manager')->willReturn($this->typedDataManager->reveal());
     \Drupal::setContainer($container->reveal());
 
     $this->entityTypeBundleInfo = new EntityTypeBundleInfo($this->entityTypeManager->reveal(), $this->languageManager->reveal(), $this->moduleHandler->reveal(), $this->typedDataManager->reveal(), $this->cacheBackend->reveal());
diff --git a/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageSchemaTest.php b/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageSchemaTest.php
index aecc3e43640bd0531048593bac5a9d9f02f0603b..db92ca9d0a1db60ce1e6fbbd02343d847132f03d 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageSchemaTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageSchemaTest.php
@@ -1151,7 +1151,7 @@ public function providerTestRequiresEntityDataMigration() {
       // Case 6: same storage class, ::hasData() === TRUE, no structure changes.
       [$updated_entity_type_definition, $original_entity_type_definition, TRUE, FALSE, FALSE],
       // Case 7: different storage class, original storage class exists,
-      //::hasData() === TRUE, no structure changes.
+      // ::hasData() === TRUE, no structure changes.
       [$updated_entity_type_definition, $original_entity_type_definition_other_existing, TRUE, FALSE, FALSE],
     ];
   }