diff --git a/core/includes/common.inc b/core/includes/common.inc
index 4bee797..367f91e 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -4389,7 +4389,7 @@ function _drupal_render_process_post_render_cache(array &$elements) {
  * drupal_render()ed). On top of that, the theme system transforms render arrays
  * into HTML strings. These two facts combined imply that it is impossible for
  * #post_render_cache callbacks to bubble up to the root of the render array.
- * Therefor, drupal_render_collect_post_render_cache() must be called *before*
+ * Therefore, drupal_render_collect_post_render_cache() must be called *before*
  * #theme callbacks, so that it has a chance to examine the full render array.
  * In short: in order to examine the full render array for #post_render_cache
  * callbacks, it must use post-order tree traversal, whereas drupal_render()
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/RenderTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/RenderTest.php
index 70c2b0c..38b6da0 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/RenderTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/RenderTest.php
@@ -816,9 +816,9 @@ function testDrupalRenderRenderCachePlaceholder() {
     $dom = Html::load($cached_element['#markup']);
     $xpath = new \DOMXPath($dom);
     $nodes = $xpath->query('//*[@token]');
-    $this->assertTrue($nodes->length > 0, 'The token attribute was found in the cached markup');
+    $this->assertTrue($nodes->length, 'The token attribute was found in the cached markup');
     $token = '';
-    if ($nodes->length > 0) {
+    if ($nodes->length) {
       $token = $nodes->item(0)->getAttribute('token');
     }
     $this->assertIdentical($token, $expected_token, 'The tokens are identical');
@@ -906,9 +906,9 @@ function testDrupalRenderChildElementRenderCachePlaceholder() {
     $dom = Html::load($cached_element['#markup']);
     $xpath = new \DOMXPath($dom);
     $nodes = $xpath->query('//*[@token]');
-    $this->assertTrue($nodes->length > 0, 'The token attribute was found in the cached child element markup');
+    $this->assertTrue($nodes->length, 'The token attribute was found in the cached child element markup');
     $token = '';
-    if ($nodes->length > 0) {
+    if ($nodes->length) {
       $token = $nodes->item(0)->getAttribute('token');
     }
     $this->assertIdentical($token, $expected_token, 'The tokens are identical for the child element');
@@ -930,9 +930,9 @@ function testDrupalRenderChildElementRenderCachePlaceholder() {
     $dom = Html::load($cached_element['#markup']);
     $xpath = new \DOMXPath($dom);
     $nodes = $xpath->query('//*[@token]');
-    $this->assertTrue($nodes->length > 0, 'The token attribute was found in the cached parent element markup');
+    $this->assertTrue($nodes->length, 'The token attribute was found in the cached parent element markup');
     $token = '';
-    if ($nodes->length > 0) {
+    if ($nodes->length) {
       $token = $nodes->item(0)->getAttribute('token');
     }
     $this->assertIdentical($token, $expected_token, 'The tokens are identical for the parent element');
@@ -958,9 +958,9 @@ function testDrupalRenderChildElementRenderCachePlaceholder() {
     $dom = Html::load($cached_element['#markup']);
     $xpath = new \DOMXPath($dom);
     $nodes = $xpath->query('//*[@token]');
-    $this->assertTrue($nodes->length > 0, 'The token attribute was found in the cached child element markup');
+    $this->assertTrue($nodes->length, 'The token attribute was found in the cached child element markup');
     $token = '';
-    if ($nodes->length > 0) {
+    if ($nodes->length) {
       $token = $nodes->item(0)->getAttribute('token');
     }
     $this->assertIdentical($token, $expected_token, 'The tokens are identical for the child element');