diff --git a/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css b/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css
index 8a3c40346a..add71e4913 100644
--- a/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css
+++ b/core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css
@@ -2,3 +2,25 @@
 .dialog-off-canvas__main-canvas.js-outside-in-edit-mode input {
   pointer-events: inherit !important;
 }
+/**
+ * Remove all transitions for testing.
+ */
+* {
+  -o-transition-property: none !important;
+  -moz-transition-property: none !important;
+  -ms-transition-property: none !important;
+  -webkit-transition-property: none !important;
+  transition-property: none !important;
+  /*CSS transforms*/
+  -o-transform: none !important;
+  -moz-transform: none !important;
+  -ms-transform: none !important;
+  -webkit-transform: none !important;
+  transform: none !important;
+  /*CSS animations*/
+  -webkit-animation: none !important;
+  -moz-animation: none !important;
+  -o-animation: none !important;
+  -ms-animation: none !important;
+  animation: none !important;
+}
diff --git a/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
index 09a7aad57c..63e470dd87 100755
--- a/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -142,6 +142,11 @@
 }
 
 $test_list = simpletest_script_get_test_list();
+if (in_array('Drupal\Tests\outside_in\FunctionalJavascript\OutsideInBlockFormTest', $test_list)) {
+  $test_list = array_fill(0, 30, 'Drupal\Tests\outside_in\FunctionalJavascript\OutsideInBlockFormTest');
+} else {
+  $test_list = [];
+}
 
 // Try to allocate unlimited time to run the tests.
 drupal_set_time_limit(0);