diff --git a/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php b/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
index a7feea1..26e4278 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
@@ -40,13 +40,13 @@ public function assertWaitOnAjaxRequest($timeout = 10000, $message = 'Unable to
    * Drupal CI Javascript tests by default use a viewport of 1024x768px.
    *
    * @param string $selector_type
-   *   The element selector type (css, xpath).
+   *   The element selector type (CSS, XPath).
    * @param string|array $selector
    *   The element selector. Note: the first found element is used.
    * @param bool|string $corner
    *   (Optional) The corner to test:
    *   topLeft, topRight, bottomRight, bottomLeft.
-   *   Or FALSE to check the complete element (default behavior).
+   *   Or FALSE to check the complete element (default).
    * @param string $message
    *   (optional) A message for the exception.
    *
@@ -64,8 +64,8 @@ public function assertVisibleInViewport($selector_type, $selector, $corner = FAL
       throw new ElementNotFoundException($this->session->getDriver(), 'element', $selector_type, $selector);
     }
 
-    // Check if the node is visible on the page, which is a perquisite of being
-    // visible in the viewport.
+    // Check if the node is visible on the page, which is a prerequisite of
+    // being visible in the viewport.
     if (!$node->isVisible()) {
       throw new ElementHtmlException($message, $this->session->getDriver(), $node);
     }
@@ -78,18 +78,17 @@ public function assertVisibleInViewport($selector_type, $selector, $corner = FAL
   }
 
   /**
-   * Test that a node, or it's specific corner, is not visible in the viewport.
+   * Test that a node, or its specific corner, is not visible in the viewport.
    *
    * Note: the node should exist in the page, otherwise this assertion fails.
    *
    * @param string $selector_type
-   *   The element selector type (css, xpath).
+   *   The element selector type (CSS, XPath).
    * @param string|array $selector
    *   The element selector. Note: the first found element is used.
    * @param bool|string $corner
-   *   (Optional) The corner to test:
-   *   topLeft, topRight, bottomRight, bottomLeft.
-   *   Or FALSE to check the complete element (default behavior).
+   *   (Optional) Corner to test: topLeft, topRight, bottomRight, bottomLeft.
+   *   Or FALSE to check the complete element (default).
    * @param string $message
    *   (optional) A message for the exception.
    *
@@ -122,9 +121,8 @@ public function assertNotVisibleInViewport($selector_type, $selector, $corner =
    * @param \Behat\Mink\Element\NodeElement $node
    *   A valid node.
    * @param bool|string $corner
-   *   (Optional) The corner to test:
-   *   topLeft, topRight, bottomRight, bottomLeft.
-   *   Or FALSE to check the complete element (default behavior).
+   *   (Optional) Corner to test: topLeft, topRight, bottomRight, bottomLeft.
+   *   Or FALSE to check the complete element (default).
    *
    * @return bool
    *   Returns TRUE if the node is visible in the viewport, FALSE otherwise.
@@ -219,7 +217,7 @@ function t(r, lx, ly) {
         r = n.getBoundingClientRect(),
         lx = (w.innerWidth || e.clientWidth),
         ly = (w.innerHeight || e.clientHeight);
-        
+
         return t(r, lx, ly);
       }($test_javascript_function));
 JS;