diff --git a/core/modules/block/src/Tests/BlockLanguageTest.php b/core/modules/block/src/Tests/BlockLanguageTest.php
index 901dd64..57ac06e 100644
--- a/core/modules/block/src/Tests/BlockLanguageTest.php
+++ b/core/modules/block/src/Tests/BlockLanguageTest.php
@@ -11,7 +11,7 @@
 use Drupal\block\Entity\Block;
 
 /**
- * Tests if a block can be configure to be only visible on a particular
+ * Tests if a block can be configured to be only visible on a particular
  * language.
  *
  * @group block
diff --git a/core/modules/block_content/src/Tests/BlockContentSaveTest.php b/core/modules/block_content/src/Tests/BlockContentSaveTest.php
index 74e296f..75c2801 100644
--- a/core/modules/block_content/src/Tests/BlockContentSaveTest.php
+++ b/core/modules/block_content/src/Tests/BlockContentSaveTest.php
@@ -78,8 +78,8 @@ public function testDeterminingChanges() {
     $block->save();
 
     // The hook implementations block_content_test_block_content_presave() and
-    // block_content_test_block_content_update() determine changes and change the
-    // title as well as programmatically set the 'changed' timestamp.
+    // block_content_test_block_content_update() determine changes and change
+    // the title as well as programmatically set the 'changed' timestamp.
     $this->assertEqual($block->label(), 'updated_presave_update', 'Changes have been determined.');
     $this->assertEqual($block->getChangedTime(), 979534800, 'Saving a custom block uses "changed" timestamp set in presave hook.');
 
diff --git a/core/modules/config/src/Tests/ConfigExportImportUITest.php b/core/modules/config/src/Tests/ConfigExportImportUITest.php
index 4e8dc78..668b287 100644
--- a/core/modules/config/src/Tests/ConfigExportImportUITest.php
+++ b/core/modules/config/src/Tests/ConfigExportImportUITest.php
@@ -243,7 +243,7 @@ public function testExportImportCollections() {
     $this->assertEqual($data, array('foo' => 'baz'), 'The config_test.another_update in collection.test2 exists in the snapshot storage.');
     $this->assertFalse($test2_snapshot->read('config_test.another_create'), 'The config_test.another_create in collection.test2 does not exist in the snapshot storage.');
 
-    // Create the tar contains the expected content for the collections.
+    // Create the tar that contains the expected content for the collections.
     $tar = new ArchiveTar($filename, 'gz');
     $content_list = $tar->listContent();
     // Convert the list of files into something easy to search.
diff --git a/core/modules/config/src/Tests/ConfigOverrideTest.php b/core/modules/config/src/Tests/ConfigOverrideTest.php
index aa8a23f..c2061ca 100644
--- a/core/modules/config/src/Tests/ConfigOverrideTest.php
+++ b/core/modules/config/src/Tests/ConfigOverrideTest.php
@@ -111,7 +111,7 @@ function testConfOverride() {
     $this->assertFalse(isset($data['baz']));
     $this->assertIdentical($data['404'], $expected_new_data['404']);
 
-    // Verify the overrides are still working.
+    // Verify that the overrides are still working.
     $config = \Drupal::config('config_test.system');
     $this->assertIdentical($config->get('foo'), $overrides['config_test.system']['foo']);
     $this->assertIdentical($config->get('baz'), $overrides['config_test.system']['baz']);
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationWorkflowsTest.php b/core/modules/content_translation/src/Tests/ContentTranslationWorkflowsTest.php
index c009e91..76470a7 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationWorkflowsTest.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationWorkflowsTest.php
@@ -83,7 +83,7 @@ function testWorkflows() {
     $expected_status = array('edit' => 200, 'overview' => 200, 'add_translation' => 200, 'edit_translation' => 200);
     $this->assertWorkflows($this->administrator, $expected_status);
 
-    // Check that translation permissions govern the associated operations.
+    // Check that translation permissions allow the associated operations.
     $ops = array('create' => t('Add'), 'update' => t('Edit'), 'delete' => t('Delete'));
     $translations_url = $this->entity->urlInfo('drupal:content-translation-overview');
     foreach ($ops as $current_op => $item) {
diff --git a/core/modules/field_ui/src/Tests/EntityDisplayTest.php b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
index b8799aa..05f2cc4 100644
--- a/core/modules/field_ui/src/Tests/EntityDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
@@ -90,7 +90,7 @@ public function testEntityDisplayCRUD() {
     $display = entity_load('entity_view_display', $display->id());
     $this->assertNULL($display->getComponent('component_3'));
 
-    // Check that CreateCopy() creates a new component that can be correctly
+    // Check that createCopy() creates a new component that can be correctly
     // saved.
     EntityViewMode::create(array('id' => $display->getTargetEntityTypeId() . '.other_view_mode', 'targetEntityType' => $display->getTargetEntityTypeId()))->save();
     $new_display = $display->createCopy('other_view_mode');
diff --git a/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php b/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php
index 07607f0..918ed61 100644
--- a/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php
+++ b/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php
@@ -133,7 +133,8 @@ function testNodeRevisionAccessPerType() {
       'account' => $accounts,
     );
 
-    // Test that the accounts have access to the corresponding page revision permissions.
+    // Test that the accounts have access to the corresponding page revision
+    // permissions.
     $revision = $this->node_revisions['page'][1];
 
     $permutations = $this->generatePermutations($parameters);
diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index d2b2095..60d0fe7 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -302,8 +302,8 @@ protected function drupalCreateContentType(array $values = array()) {
    *
    * Entities postpone the composition of their renderable arrays to #pre_render
    * functions in order to maximize cache efficacy. This means that the full
-   * renderable array for an entity is constructed in drupal_render(). Some tests
-   * require the complete renderable array for an entity outside of the
+   * renderable array for an entity is constructed in drupal_render(). Some
+   * tests require the complete renderable array for an entity outside of the
    * drupal_render process in order to verify the presence of specific values.
    * This method isolates the steps in the render process that produce an
    * entity's renderable array.
diff --git a/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php b/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
index 73cffc2..cc0d9df 100644
--- a/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
+++ b/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
@@ -571,7 +571,7 @@ function testInvalidateTags() {
 
     Cache::invalidateTags(array('test_tag:2'));
 
-    // Test that cache entry has been invalidated in multiple bins.
+    // Test that the cache entry has been invalidated in multiple bins.
     foreach ($bins as $bin) {
       $this->assertFalse($this->getCacheBackend($bin)->get('test'), 'Tag invalidation affected item in bin.');
     }
diff --git a/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php b/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php
index f84c3e4..141e376 100644
--- a/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php
+++ b/core/modules/system/src/Tests/Common/MergeAttachmentsTest.php
@@ -19,7 +19,7 @@
 class MergeAttachmentsTest extends KernelTestBase {
 
   /**
-   * Tests just library asset merging.
+   * Tests library asset merging.
    */
   function testLibraryMerging() {
     $a['#attached'] = array(
@@ -67,7 +67,7 @@ function testLibraryMerging() {
   }
 
   /**
-   * Tests just JavaScript and JavaScript setting asset merging.
+   * Tests JavaScript and JavaScript setting asset merging.
    */
   function testJsSettingMerging() {
     $a['#attached'] = array(
diff --git a/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php b/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php
index 9f14873..a3262ea 100644
--- a/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityQueryAggregateTest.php
@@ -526,7 +526,8 @@ public function testAggregation() {
       array('field_test_1' => 1, 'field_test_2_count' => 2),
     ));
 
-    // Groupby and aggregate by fieldapi field, and sort by the aggregated field.
+    // Groupby and aggregate by fieldapi field, and sort by the aggregated
+    // field.
     $this->queryResult = $this->factory->getAggregate('entity_test')
       ->groupBy('field_test_1')
       ->sortAggregate('field_test_2', 'COUNT', 'DESC')
diff --git a/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php b/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
index 9faa604..1b27711 100644
--- a/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
+++ b/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
@@ -22,8 +22,8 @@ class UpcastingTest extends WebTestBase {
   /**
    * Confirms that all parameters are converted as expected.
    *
-   * All of these requests end up being processed by a controller with this
-   * the signature: f($user, $node, $foo) returning either values or labels
+   * All of these requests end up being processed by a controller with the
+   * signature: f($user, $node, $foo) returning either values or labels
    * like "user: Dries, node: First post, foo: bar"
    *
    * The tests shuffle the parameters around an checks if the right thing is
diff --git a/core/modules/system/theme.api.php b/core/modules/system/theme.api.php
index b319c2e..2d38382 100644
--- a/core/modules/system/theme.api.php
+++ b/core/modules/system/theme.api.php
@@ -35,12 +35,13 @@
  * The theme system is invoked in drupal_render() by calling the internal
  * _theme() function, which operates on the concept of "theme hooks". Theme
  * hooks define how a particular type of data should be rendered. They are
- * registered by modules by implementing hook_theme(), which specifies the name of
- * the hook, the input "variables" used to provide data and options, and other
- * information. Modules implementing hook_theme() also need to provide a default
- * implementation for each of their theme hooks, normally in a Twig file, and
- * they may also provide preprocessing functions. For example, the core Search
- * module defines a theme hook for a search result item in search_theme():
+ * registered by modules by implementing hook_theme(), which specifies the name
+ * of the hook, the input "variables" used to provide data and options, and
+ * other information. Modules implementing hook_theme() also need to provide a
+ * default implementation for each of their theme hooks, normally in a Twig
+ * file, and they may also provide preprocessing functions. For example, the
+ * core Search module defines a theme hook for a search result item in
+ * search_theme():
  * @code
  * return array(
  *   'search_result' => array(
diff --git a/core/modules/views/src/Plugin/views/argument/ArgumentPluginBase.php b/core/modules/views/src/Plugin/views/argument/ArgumentPluginBase.php
index d7e5135..e863101 100644
--- a/core/modules/views/src/Plugin/views/argument/ArgumentPluginBase.php
+++ b/core/modules/views/src/Plugin/views/argument/ArgumentPluginBase.php
@@ -651,7 +651,7 @@ public function defaultAction($info = NULL) {
   }
 
   /**
-   * How to act if validation fails
+   * How to act if validation fails.
    */
   public function validateFail() {
     $info = $this->defaultActions($this->options['validate']['fail']);
diff --git a/core/modules/views/src/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php b/core/modules/views/src/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php
index c6405a9..7a6cf67 100644
--- a/core/modules/views/src/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php
+++ b/core/modules/views/src/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php
@@ -102,7 +102,7 @@ public function validateArgument($arg) { return TRUE; }
   /**
    * Process the summary arguments for displaying.
    *
-   * Some plugins alter the argument so it uses something else internal.
+   * Some plugins alter the argument so it uses something else internally.
    * For example the user validation set's the argument to the uid,
    * for a faster query. But there are use cases where you want to use
    * the old value again, for example the summary.
diff --git a/core/modules/views/src/Plugin/views/filter/FilterPluginBase.php b/core/modules/views/src/Plugin/views/filter/FilterPluginBase.php
index a6acce5..031a8e7 100644
--- a/core/modules/views/src/Plugin/views/filter/FilterPluginBase.php
+++ b/core/modules/views/src/Plugin/views/filter/FilterPluginBase.php
@@ -1302,7 +1302,7 @@ public function storeGroupInput($input, $status) {
     // know where to look for session stored values.
     $display_id = ($this->view->display_handler->isDefaulted('filters')) ? 'default' : $this->view->current_display;
 
-    // false means that we got a setting that means to recurse ourselves,
+    // False means that we got a setting that means to recurse ourselves,
     // so we should erase whatever happened to be there.
     if ($status === FALSE && isset($_SESSION['views'][$this->view->storage->id()][$display_id])) {
       $session = &$_SESSION['views'][$this->view->storage->id()][$display_id];
@@ -1394,7 +1394,7 @@ public function storeExposedInput($input, $status) {
     // shortcut test.
     $operator = !empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id']);
 
-    // false means that we got a setting that means to recurse ourselves,
+    // False means that we got a setting that means to recurse ourselves,
     // so we should erase whatever happened to be there.
     if (!$status && isset($_SESSION['views'][$this->view->storage->id()][$display_id])) {
       $session = &$_SESSION['views'][$this->view->storage->id()][$display_id];
diff --git a/core/modules/views/src/Plugin/views/query/Sql.php b/core/modules/views/src/Plugin/views/query/Sql.php
index ede6508..55a97cf 100644
--- a/core/modules/views/src/Plugin/views/query/Sql.php
+++ b/core/modules/views/src/Plugin/views/query/Sql.php
@@ -604,7 +604,7 @@ protected function ensurePath($table, $relationship = NULL, $join = NULL, $trace
 
     // Have we been this way?
     if (isset($traced[$join->leftTable])) {
-      // we looped. Broken.
+      // We looped. Broken.
       return FALSE;
     }
 
diff --git a/core/modules/views/src/Plugin/views/style/StylePluginBase.php b/core/modules/views/src/Plugin/views/style/StylePluginBase.php
index e6447ab..c07a5b8 100644
--- a/core/modules/views/src/Plugin/views/style/StylePluginBase.php
+++ b/core/modules/views/src/Plugin/views/style/StylePluginBase.php
@@ -611,7 +611,7 @@ public function renderGrouping($records, $groupings = array(), $group_rendered =
       );
     }
 
-    // If this parameter isn't explicitly set modify the output to be fully
+    // If this parameter isn't explicitly set, modify the output to be fully
     // backward compatible to code before Views 7.x-3.0-rc2.
     // @TODO Remove this as soon as possible e.g. October 2020
     if ($group_rendered === NULL) {
diff --git a/core/modules/views/src/Tests/GlossaryTest.php b/core/modules/views/src/Tests/GlossaryTest.php
index d932186..023bfc0 100644
--- a/core/modules/views/src/Tests/GlossaryTest.php
+++ b/core/modules/views/src/Tests/GlossaryTest.php
@@ -33,7 +33,7 @@ class GlossaryTest extends ViewTestBase {
    * Tests the default glossary view.
    */
   public function testGlossaryView() {
-    // create a content type and add some nodes, with a non random title.
+    // Create a content type and add some nodes, with a non-random title.
     $type = $this->drupalCreateContentType();
     $nodes_per_char = array(
       'd' => 1,
diff --git a/core/modules/views/src/Tests/Handler/FieldWebTest.php b/core/modules/views/src/Tests/Handler/FieldWebTest.php
index c2da677..4efd4ef 100644
--- a/core/modules/views/src/Tests/Handler/FieldWebTest.php
+++ b/core/modules/views/src/Tests/Handler/FieldWebTest.php
@@ -295,7 +295,8 @@ public function testAlterUrl() {
     $this->assertSubString($output, UrlHelper::encodePath('Drupal Has A Great Community'));
     unset($id_field->options['alter']['path_case']);
 
-    // Tests the linkclass setting and see whether it actually exists in the output.
+    // Tests the linkclass setting and see whether it actually exists in the
+    // output.
     $id_field->options['alter']['link_class'] = $class = $this->randomMachineName();
     $output = $id_field->theme($row);
     $elements = $this->xpathContent($output, '//a[contains(@class, :class)]', array(':class' => $class));
diff --git a/core/modules/views/src/Tests/Handler/HandlerAllTest.php b/core/modules/views/src/Tests/Handler/HandlerAllTest.php
index 39f254c..c4c6497 100644
--- a/core/modules/views/src/Tests/Handler/HandlerAllTest.php
+++ b/core/modules/views/src/Tests/Handler/HandlerAllTest.php
@@ -93,7 +93,8 @@ public function testHandlers() {
         }
       }
 
-      // Go through each step individually to see whether some parts are failing.
+      // Go through each step individually to see whether some parts are
+      // failing.
       $view->build();
       $view->preExecute();
       $view->execute();
diff --git a/core/modules/views/tests/modules/views_test_data/src/Plugin/views/display/DisplayTest.php b/core/modules/views/tests/modules/views_test_data/src/Plugin/views/display/DisplayTest.php
index 950f71b..ca3ee32 100644
--- a/core/modules/views/tests/modules/views_test_data/src/Plugin/views/display/DisplayTest.php
+++ b/core/modules/views/tests/modules/views_test_data/src/Plugin/views/display/DisplayTest.php
@@ -40,7 +40,8 @@ protected function getType() {
   }
 
   /**
-   * Overrides Drupal\views\Plugin\views\display\DisplayPluginBase::defineOptions().
+   * Overrides
+   * Drupal\views\Plugin\views\display\DisplayPluginBase::defineOptions().
    */
   protected function defineOptions() {
     $options = parent::defineOptions();
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index a96f14a..01e8ab7 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -109,8 +109,9 @@ function template_preprocess_views_view_fields(&$variables) {
         $field_output = $pre . '>' . $field_output . '</' . $object->element_type . '>';
       }
 
-      // Protect ourselves somewhat for backward compatibility. This will prevent
-      // old templates from producing invalid HTML when no element type is selected.
+      // Protect ourselves somewhat for backward compatibility. This will
+      // prevent old templates from producing invalid HTML when no element type
+      // is selected.
       if (empty($object->element_type)) {
         $object->element_type = 'span';
       }
diff --git a/core/modules/views_ui/css/views_ui.admin.theme.css b/core/modules/views_ui/css/views_ui.admin.theme.css
index ed7d66f..656892d 100644
--- a/core/modules/views_ui/css/views_ui.admin.theme.css
+++ b/core/modules/views_ui/css/views_ui.admin.theme.css
@@ -745,7 +745,7 @@ td.group-title {
 
 /* @group Attachment bucket overridden
  *
- * Applies a overridden(italics) font style to overridden buckets.
+ * Applies an overridden(italics) font style to overridden buckets.
  * The better way to implement this would be to add the overridden class
  * to the bucket header when the bucket is overridden and style it as a
  * generic icon classed element. For the moment, we'll style the bucket