.../system/tests/modules/test_page_test/src/Controller/Test.php     | 6 ++++++
 core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php           | 2 +-
 core/tests/Drupal/Tests/BrowserTestBase.php                         | 2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/core/modules/system/tests/modules/test_page_test/src/Controller/Test.php b/core/modules/system/tests/modules/test_page_test/src/Controller/Test.php
index 8e9c58d..e754eaf 100644
--- a/core/modules/system/tests/modules/test_page_test/src/Controller/Test.php
+++ b/core/modules/system/tests/modules/test_page_test/src/Controller/Test.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Drupal\test_page_test\Controller;
+
 use Drupal\Core\Url;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpKernel\Exception\HttpException;
@@ -112,6 +113,11 @@ public function renderPipeInLink() {
 
   /**
    * Loads a page that does a redirect.
+   *
+   * Drupal uses Symfony's RedirectResponse for generating redirects. That class
+   * uses a lower-case 'http-equiv="refresh"'.
+   *
+   * @see \Symfony\Component\HttpFoundation\RedirectResponse
    */
   public function metaRefresh() {
     return new RedirectResponse(Url::fromRoute('test_page_test.test_page', [], ['absolute' => TRUE])->toString(), 302);
diff --git a/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php b/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
index 0b7fc89..9c3642f 100644
--- a/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
+++ b/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
@@ -603,7 +603,7 @@ public function testLocalTimeZone() {
   }
 
   /**
-   * Tests redirecting using the checkForMetaRefresh method.
+   * Tests the ::checkForMetaRefresh() method.
    */
   public function testCheckForMetaRefresh() {
     // Disable following redirects in the client.
diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index c3b10a8..341af24 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -1399,7 +1399,7 @@ protected function getTestMethodCaller() {
    * Checks for meta refresh tag and if found call drupalGet() recursively.
    *
    * This function looks for the http-equiv attribute to be set to "Refresh" and
-   * is case-sensitive.
+   * is case-insensitive.
    *
    * @return string|false
    *   Either the new page content or FALSE.