Issue #2901626 by tedbow, vaplas: CSS animations cause...

Issue #2901626 by tedbow, vaplas: CSS animations cause \Drupal\Tests\outside_in\FunctionalJavascript\OutsideInBlockFormTest random fails

core/modules/outside_in/tests/modules/outside_in_test_css/css/css_fix.theme.css

@@ -2,3 +2,26 @@
 .dialog-off-canvas__main-canvas.js-outside-in-edit-mode input {
   pointer-events: inherit !important;
 }
+/**
+ * Remove all transitions for testing.
+ */
+* {
+  /* CSS transitions. */
+  -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;
+}